Switch statement help!!

ive not done switch statements before, i have a list of months and i have a number from another method which i need to use in this switch statement to obtain the right month.
example is that the other method returns me with the number 4.....this should give me the month april =D
im not sure where to go with this.....
private static String getMonthName(String[] args)
        switch (month)
            case 1: monthName = "January"; break;
            case 2: monthName = "February"; break;
            case 3: monthName = "March"; break;
            case 4: monthName = "April"; break;
            case 5: monthName = "May"; break;
            case 6: monthName = "June"; break;
            case 7: monthName = "July"; break;
            case 8: monthName = "August"; break;
            case 9: monthName = "September"; break;
            case 10: monthName = "October"; break;
            case 11: monthName = "November"; break;
            case 12: monthName = "December"; break;
            default: System.out.println("Invalid month.");break;
        }

Either you can do this
      private static String getMonthName(String[] args)
        month=getMonthIndex();
        switch (month)
            case 1: monthName = "January"; break;
            case 2: monthName = "February"; break;
            case 3: monthName = "March"; break;
            case 4: monthName = "April"; break;
            case 5: monthName = "May"; break;
            case 6: monthName = "June"; break;
            case 7: monthName = "July"; break;
            case 8: monthName = "August"; break;
            case 9: monthName = "September"; break;
            case 10: monthName = "October"; break;
            case 11: monthName = "November"; break;
            case 12: monthName = "December"; break;
            default: System.out.println("Invalid month.");break;
or this
      private static String getMonthName(String[] args)
        switch (getMonthIndex())
            case 1: monthName = "January"; break;
            case 2: monthName = "February"; break;
            case 3: monthName = "March"; break;
            case 4: monthName = "April"; break;
            case 5: monthName = "May"; break;
            case 6: monthName = "June"; break;
            case 7: monthName = "July"; break;
            case 8: monthName = "August"; break;
            case 9: monthName = "September"; break;
            case 10: monthName = "October"; break;
            case 11: monthName = "November"; break;
            case 12: monthName = "December"; break;
            default: System.out.println("Invalid month.");break;
              Assuming that you have a method which returns an index representing a month which in this case i have assumed as getMonthIndex( )

Similar Messages

Switch statement help please

I have been advised on this forum that a switch statement in place of the if else etc would be neater. Could someone tell me where the switch statement goes in the code below.
Thanks
Calculator class Calculator.java
class Calculator {
public void Calculator() {
public double workOut(String s1) {
int count = 0, i_s1_len = 0, i_dot=0, i_neg =0;
double d_calc=0,d_num = 0, d_snum=0 ;
String s2 = "", s3 = "", s_num="";
if (s1.length()==0){ //Check for an input eg contains at least one character
System.out.println("Sorry you must input a equation ending in an equals '=' sign");
return 0;
else {
i_s1_len = s1.length();
count = 0; //reset count to zero
//remove spaces s2 becomes the equation
for (count=0; count+1 <= i_s1_len;){
if (s1.charAt(count)==32){
count++;
else{
s2=s2+s1.charAt(count);
count++;
i_s1_len = s2.length();//
// check final character is an "=" sign
if (s2.endsWith("=")){
else{
System .out.println( "Sorry your equation must end with an = sign ");
return 0;
// Checking if characters in the equation are legal eg 1-9 or ()-+/*. or the = sign is only at the end.
count = 0; //reset
for (count=0; count+1 <= i_s1_len;){
if ((s2.charAt(count)>39)&(s2.charAt(count)<58)){
count++;
else if ((s2.charAt(count)==61) & (count != i_s1_len-1)) {
System.out.println("Operator'=' is in two places ");
return 0;
else{
count++;
// Selecting Calculation type +-*/ and calculation Type and conversion
for (count=0; count+1 <= i_s1_len;){
//Addition calculation 43 = +
if (s2.charAt(count)== 43){
s3="+";
// Subtraction Calculation 45 = -
else if (s2.charAt(count)== 45){
s3="-";
// check for minus minus
if (s2.charAt(count+1)== 45){
s3="+";
// multiplication Calculation 42 = *
else if (s2.charAt(count)== 42){
s3="*";
// Division Calculation 47 =/
else if (s2.charAt(count)== 47){
s3="/";
//Get String for conversion to number
else s_num=s_num+s2.charAt(count);{
count++;
// Transfer number to single varable
while ((s2.charAt(count)>47)&(s2.charAt(count)<58)||(s2.charAt(count)==46)){
s_num=s_num+s2.charAt(count);
count++;
//check for multiple decimal points
if (s2.charAt(count-1)==46){
i_dot++;
if (i_dot > 1){
System.out.println("One of your numbers contains two decimals points ");
return 0;
i_dot=0; //reset decimal counter
// Get opperator + - * /
if (s3 =="+"){
d_num = d_num + Double.parseDouble(s_num);
else if (s3 =="-"){
d_num = d_num - Double.parseDouble(s_num);
else if (s3 =="*"){
d_num = d_num * Double.parseDouble(s_num);
else if (s3 =="/"){
if (Double.parseDouble(s_num)==0){
System.out.println("You are trying to divide by Zero which is infinity");
return 0;
d_num = d_num / Double.parseDouble(s_num);
else{
d_num = Double.parseDouble(s_num);
s_num="";
if (s2.length()==count+1) {
return d_num;
return d_num;

Instead of writing
if (x == 1)
    // do this
else if (x == 2)
    // do that
else
    // do the otheryou can write
switch (x) {
case 1:
    // do this
    break;
case 2:
    // do that
    break;
default:
    // do the other
    break;
}

HELP -menu using a switch statement

Hello to all. I'm new to the Java world, but currently taking my first Java class online. Not sure if this is the right place, but I need some help. In short I need to write a program that gives the user a menu to chose from using a switch statement. The switch statement should include a while statement so the user can make more than one selection on the menu and provide an option to exit the program.
With in the program I am to give an output of all counting numbers (6 numbers per line).
Can anyone help me with this?? If I'm not asking the right question please let me know or point me in the direction that can help me out.
Thanks in advance.
Here is what I have so far:
import java.util.*;
public class DoWhileDemo
     public static void main(String[] args)
          int count, number;
          System.out.println("Enter a number");
          Scanner keyboard = new Scanner (System.in);
          number = keyboard.nextInt();
          count = number;
          do
               System.out.print(count +",");
               count++;
          }while (count <= 32);
          System.out.println();
          System.out.println("Buckle my shoe.");
}

Thanks for the reply. I will tk a look at the link that was provided. However, I have started working on the problem, but can't get the 6 numbers per line. I am trying to figure out the problem in parts. Right now I'm working on the numbers, then the menu, and so on.
Should I tk this approach or another?
Again, thanks for the reply.

Methods & Switch Statement in java.. HELP!!

hi all...
i am having a slight problem as i am constructing a method --> menu() which handles displaying
menu options on the screen, prompting the user to select A, B, C, D, S or Q... and then returns the user
input to the main method!!!
i am having issues with switch statement which processes the return from menu() methd,,,
could you please help?!!
here is my code...
import java.text.*;
import java.io.*;
public class StudentDriver
   public static void main(String[] args) throws IOException
      for(;;)
         /* Switch statement for menu manipulation */
         switch(menu())
               case A: System.out.println("You have selected option A");
                              break;
               case B: System.out.println("You have selected option B");
                              break;
               case C: System.out.println("You have selected option C");
                              break;
               case D: System.out.println("You have selected option D");
                              break;
               case S: System.out.println("You have selected option S");
                              break;
               case Q: System.out.println("\n\n\n\n\n\n\t\t Thank you for using our system..." +
                                                                "\n\n\t\t\t Good Bye \n\n\n\n");
                              exit(0);
   static char menu()
      char option;
      BufferedReader stdin = new BufferedReader(new InputStreamReader(System.in));
      System.out.println("\n\n");
      System.out.println("\n\t\t_________________________");
      System.out.println("\t\t|                       |");
      System.out.println("\t\t| Student Manager Menu |");
      System.out.println("\t\t|_______________________|");
      System.out.println("\n\t________________________________________");
      System.out.println("\t| \t\t\t\t\t|");
      System.out.println("\t| Add new student\t\t A \t|");
      System.out.println("\t| Add credits\t\t\t B \t|");
      System.out.println("\t| Display one record\t\t C \t|");
      System.out.println("\t| Show the average credits\t D \t|");
      System.out.println("\t| \t\t\t\t\t|");
      System.out.println("\t| Save the changes\t\t S \t|");
      System.out.println("\t| Quit\t\t\t\t Q \t|");
      System.out.println("\t|_______________________________________|\n");
      System.out.print("\t Your Choice: ");
      option = stdin.readLine();
         return option;
}Thanking your help in advance...
yours...
khalid

Hi,
There are few changes which u need to make for making ur code work.
1) In main method, in switch case change case A: to case 'A':
Characters should be represented in single quotes.
2) in case 'Q' change exit(0) to System.exit(0);
3) The method static char menu() { should be changed to static char menu() throws IOException   {
4) Change option = stdin.readLine(); to
option = (char)stdin.read();
Then compile and run ur code. This will work.
Or else just copy the below code
import java.text.*;
import java.io.*;
public class StudentDriver{
     public static void main(String[] args) throws IOException {
          for(;;) {
               /* Switch statement for menu manipulation */
               switch(menu()) {
                    case 'A': System.out.println("You have selected option A");
                    break;
                    case 'B': System.out.println("You have selected option B");
                    break;
                    case 'C': System.out.println("You have selected option C");
                    break;
                    case 'D': System.out.println("You have selected option D");
                    break;
                    case 'S': System.out.println("You have selected option S");
                    break;
                    case 'Q':
                    System.out.println("\n\n\n\n\n\n\t\t Thank you for using our system..." +
                    "\n\n\t\t\t Good Bye \n\n\n\n");
                    System.exit(0);
     static char menu() throws IOException {
          char option;
          BufferedReader stdin = new BufferedReader(new InputStreamReader(System.in));
          System.out.println("\n\n");
          System.out.println("\n\t\t_________________________");
          System.out.println("\t\t| |");
          System.out.println("\t\t| Student Manager Menu |");
          System.out.println("\t\t|_______________________|");
          System.out.println("\n\t________________________________________");
          System.out.println("\t| \t\t\t\t\t|");
          System.out.println("\t| Add new student\t\t A \t|");
          System.out.println("\t| Add credits\t\t\t B \t|");
          System.out.println("\t| Display one record\t\t C \t|");
          System.out.println("\t| Show the average credits\t D \t|");
          System.out.println("\t| \t\t\t\t\t|");
          System.out.println("\t| Save the changes\t\t S \t|");
          System.out.println("\t| Quit\t\t\t\t Q \t|");
          System.out.println("\t|_______________________________________|\n");
          System.out.print("\t Your Choice: ");
          option = (char)stdin.read();
          return option;
regards
Karthik

HELP A COMPLETE NOOB! Java Switch Statement?

Hi, I am trying to use a simple switch statement and I just cant seem to get it to work?;
import java.util.Scanner;
public class Month {
public static void main(String[] args) {
String message;
Scanner scan = new Scanner(System.in);
System.out.println("Enter a number:");
message = scan.nextLine();
int month = 8;
if (month == 1) {
System.out.println("January");
} else if (month == 2) {
System.out.println("February");
switch (month) {
case 1: System.out.println("January"); break;
case 2: System.out.println("February"); break;
case 3: System.out.println("March"); break;
case 4: System.out.println("April"); break;
case 5: System.out.println("May"); break;
case 6: System.out.println("June"); break;
case 7: System.out.println("July"); break;
case 8: System.out.println("August"); break;
case 9: System.out.println("September"); break;
case 10: System.out.println("October"); break;
case 11: System.out.println("November"); break;
case 12: System.out.println("December"); break;
default: System.out.println("Invalid month.");break;}
Please can anyone help, all I want is to enter a number and the corresponding month to appear. Thank you.

This will work.
import java.util.Scanner;
public class Month {
public static void main(String[] args) {
// read user input
Scanner scan = new Scanner(System.in);
System.out.println("Enter a number:");
int month = scan.nextInt();
// print the month
switch (month) {
case 1: System.out.println("January"); break;
case 2: System.out.println("February"); break;
case 3: System.out.println("March"); break;
case 4: System.out.println("April"); break;
case 5: System.out.println("May"); break;
case 6: System.out.println("June"); break;
case 7: System.out.println("July"); break;
case 8: System.out.println("August"); break;
case 9: System.out.println("September"); break;
case 10: System.out.println("October"); break;
case 11: System.out.println("November"); break;
case 12: System.out.println("December"); break;
default: System.out.println("Invalid month.");break;}
}

Java Program.. HELP (switch statement)

I need help on fixing this program for school.ive looked at information online but i still do not see what i am doing wrong.
The College Rewards Program is based on a student�s achievements on the ACT Test. Students that have excelled on the test are going to be rewarded for the hard work that they put into high school and studying for the exam. The following are the rewards that will be given to students. They are cumulative, and they get all rewards below their score.
1. 35-36 $100 a week spending money
2. 33-34 Free computer
3. 31-32 $10,000 free room and board
4. 25-30 $5000 off the years tuition
5. 21-24 $500 in free books per year
6. 17-20 Free notebook
7. 0-16 Sorry, no rewards, please study and try taking the ACT again.
Make a prompt so the user is asked for their ACT score( be careful).
Change the ACT score into a number
Then have the program use that number to display a message about the Rewards program.
Sample output:
What was your score on the ACT: 44
Entry error, please enter a number from 0 to 36.      (error trap wrong numbers)
What was your score on the ACT: 27
You got a 27 on the ACT, your rewards are:      ( have it number the rewards)
1. $5,000 off the year�s tuition
2. $500 dollars a year in books
3. A free notebook
Congratulations on your hard work and good score.
import java.util.Scanner;
import java.text.*;
public class Act
    public static void main (String [] args)
         Scanner scan = new Scanner( System.in );
          int score,reward;
          score=0;
          boolean goodnum;
          do
                  System.out.println( "What was your ACT score? " );
                          score = scan.nextInt() ;
          if (score >0 || score <36) goodnum = true;
               else
                System.out.println ("Please enter the correct number");
                          goodnum=false;
                while (score<0 || score>36) {
                          if (score==35 || score==36) reward=1;
                               else if (score ==34 || score score==33) reward=2;
                                    else if (score==32 || score==31) reward=3;
                                         else if (score>=25 && score<=30) reward=4;
                                              else if (score>=21 && score<=24) reward=5;
                                                 else if (score>=17 && score<=20) reward=6;
                                                          else reward=7;
    c=0
    switch (reward) {
    case 1: $100 a week spending money
              c++
              System.out.println ("$100 a week spending money");
    case 2:     Free computer
              c++
              System.out.println ("Free computer");
        case 3:      $10,000 free room and board
              c++
              System.out.println ("$10,000 free room and board");
    case 4:      $5000 off the years tuition
          c++
          System.out.println ("$5000 off the years tuition");
    case 5:      $500 in free books per year
          c++
           System.out.println ("$500 in free books per year");
    case 6:      Free notebook
          c++
          System.out.println ("Free notebook");
    case 7:      Free notebook
          c++
          System.out.println ("Sorry, no rewards, please study and try taking the ACT again.");
          break;
    default:
         System.out.println ("Sorry, no rewards, please study and try taking the ACT again.");
        break;
    }

There are some strange things going on here that could be fixed, so I'll just put my version of how i'd handle this up.
import java.util.Scanner;
import java.text.*; // is this really needed? Scanner's the only class I see
public class Act {
public static void main( String[] args ) {
    Scanner scan = new Scanner( System.in );
    int score, reward; // don't need to set a value yet
    boolean goodnum;
    do {
      System.out.println( "What was your ACT score? " );
      score = scan.nextInt();
      if ( score >= 0 && score <= 36 ) goodnum = true; // note the && and =s
      else {
        System.out.println( "Please enter a valid number (between 0 and 36)." );
        goodnum = false;
    } while ( !goodnum ); // when this loop finished, the number will be between 0 and 36, a good number
    if ( score >= 35 ) reward = 1;      // save yourself the typing, by now score must be between 0 and 36
    else if ( score >= 33 ) reward = 2; // so just go down with else ifs.
    else if ( score >= 31 ) reward = 3; // this will only reach the lowest point.
    else if ( score >= 25 ) reward = 4;
    else if ( score >= 21 ) reward = 5;
    else if ( score >= 17 ) reward = 6;
    else reward = 7;
    // what was the c for? reward already tells how well they did
    // You handled the switch statement almost perfectly
    // don't break so that reward progressively adds to the output
    if ( reward >= 6 ) { // this if statement is optional, just for good esteem. You could even take it out of the if{}
      System.out.println( "For your score of "+String.valueOf( score )+" you will be rewarded the following:" );
    switch ( reward ) {
      case 1: // $100/week spending money
        System.out.println( "$100 a week spending money." );
      case 2: // Free computer
        System.out.println( "Free computer." );
      case 3: // $10,000 room and board
        System.out.println( "$10,000 free room and board." );
      case 4: // $5000 off tuition
        System.out.println( "$5000 off the year's tuition." );
      case 5: // $500 in free books per year
        System.out.println( "$500 in free books per year." );
      case 6: // Free notebook
        System.out.println( "Free notebook." );
        break; // break here to keep away from discouraging the fine score
      case 7: // since 7 and default are the same result, ignore this and it'll pass to default
      default: // but technically, since reward must be from 1 to 7, default would never explicitly be called
        System.out.println( "Sorry, no rewards. Please study and try taking the ACT again." );
        break; // likely this break is unneccessary
}That works in my head, hope it works on your computer.

Help with Switch statements using Enums?

Hello, i need help with writing switch statements involving enums. Researched a lot but still cant find desired answer so going to ask here. Ok i'll cut story short.
Im writing a calculator program. The main problem is writing code for controlling the engine of calculator which sequences of sum actions.
I have enum class on itself. Atm i think thats ok. I have another class - the engine which does the work.
I planned to have a switch statement which takes in parameter of a string n. This string n is received from the user interface when users press a button say; "1 + 2 = " which each time n should be "1", "+", "2" and "=" respectively.
My algorithm would be as follows checking if its a operator(+) a case carry out adding etc.. each case producing its own task. ( I know i can do it with many simple if..else but that is bad programming technique hence im not going down that route) So here the problem arises - i cant get the switch to successfully complete its task... How about look at my code to understand it better.
I have posted below all the relevant code i got so far, not including the swing codes because they are not needed here...
ValidOperators v;
public Calculator_Engine(ValidOperators v){
          stack = new Stack(20);
          //The creation of the stack...
          this.v = v;
public void main_Engine(String n){
     ValidOperators v = ValidOperators.numbers;
                *vo = vo.valueOf(n);*
     switch(v){
     case Add: add(); break;
     case Sub: sub(); break;
     case Mul: Mul(); break;
     case Div: Div(); break;
     case Eq:sum = stack.sPop(); System.out.println("Sum= " + sum);
     default: double number = Integer.parseInt(n);
                   numberPressed(number);
                   break;
                  //default meaning its number so pass it to a method to do a job
public enum ValidOperators {
     Add("+"), Sub("-"), Mul("X"), Div("/"),
     Eq("="), Numbers("?"); }
     Notes*
It gives out error: "No enum const class ValidOperators.+" when i press button +.
It has nothing to do with listeners as it highlighted the error is coming from the line:switch(v){
I think i know where the problem is.. the line "vo = vo.valueOf(n);"
This line gets the string and store the enum as that value instead of Add, Sub etc... So how would i solve the problem?
But.. I dont know how to fix it. ANy help would be good
Need more info please ask!
Thanks in advance.

demo:
import java.util.*;
public class EnumExample {
    enum E {
        STAR("*"), HASH("#");
        private String symbol;
        private static Map<String, E> map = new HashMap<String, E>();
        static {
            put(STAR);
            put(HASH);
        public String getSymbol() {
            return symbol;
        private E(String symbol) {
            this.symbol = symbol;
        private static void put(E e) {
            map.put(e.getSymbol(), e);
        public static E parse(String symbol) {
            return map.get(symbol);
    public static void main(String[] args) {
        System.out.println(E.valueOf("STAR")); //succeeds
        System.out.println(E.parse("*")); //succeeds
        System.out.println(E.parse("STAR")); //fails: null
        System.out.println(E.valueOf("*")); //fails: IllegalArgumentException
}

Help With Switch Statements

Alrighty, so I have to do this assignment for my Java course, using a switch statement. The assignment is to have the user enter a number (1-5), and have the corresponding line of a poem be displayed. So if the user entered 1, "One two, buckle your shoe" would be displayed. This is what I have and it's giving me a huge problem:
import java.util.Scanner;
public class Poem
     public static void main(String[] args);
          Scanner kboard = new Scanner(System.in);
          System.out.println("Enter a number 1-5 (or 0 to quit).");
          int n = kboard.nextLine();
          switch (n);
               case 1: System.out.println("One two, buckle your shoe.");
               break;
               case 2: System.out.println("Three four, shut the door.");
               break;
               case 3: System.out.println("Five six, pick up sticks.");
               break;
               case 4: System.out.println("Seven eight, lay them straight.");
               break;
               case 5: System.out.println("Nine ten, a big fat hen.");
               break;
               default: System.out.println("Goodbye.");
               break;
}This is giving me a HUGE string of errors. (Something like 45). I'm wracking my brain here trying to figure this out. Any help is greatly appreciated. Thanks!

Well that solved a lot of the errors. Now all I get is this:
--------------------Configuration: <Default>--------------------
C:\JavaPrograms\Poem.java:8: <identifier> expected
System.out.println("Enter a number 1-5 (or 0 to quit).");
^
C:\JavaPrograms\Poem.java:8: illegal start of type
System.out.println("Enter a number 1-5 (or 0 to quit).");
^
C:\JavaPrograms\Poem.java:12: illegal start of type
switch (n) {
^
C:\JavaPrograms\Poem.java:12: <identifier> expected
switch (n) {
^
C:\JavaPrograms\Poem.java:14: orphaned case
case 1: System.out.println("One two, buckle your shoe.");
^
C:\JavaPrograms\Poem.java:30: class, interface, or enum expected
}

Having problem with switch statement..please help

here my question :
GUI-based Pay Calculator
A company pays its employees as executives (who receive a fixed weekly salary) and hourly workers (who receive a fixed hourly salary for the first 40 hours they work in a week, and 1.5 times their hourly wage for overtime worked).
Each category of employee has its own paycode :
?     Paycode 1 for executives
?     Paycode 2 for hourly workers
Write a GUI-based application to compute the weekly pay for each employee. Use switch to compute each employee?s pay based on that employee?s paycode.
Use CardLayout layout manager to display appropriate GUI components. Obtain the employee name, employee paycode and other necessary facts from the user to calculate the employee?s pay based on the employee paycode:
?     For paycode 1, obtain the weekly salary.
?     For paycode 2, obtain the hourly salary and the number of hours worked.
You may obtain other information which you think is necessary from the user.
Use suitable classes for the GUI elements. (You can use javax.swing package or java.awt package for the GUI elements.)
here my code so far :
import java.awt.;*
import java.awt.event.;*
import javax.swing.;*
*public class PayrollSystem implements ItemListener {*
JPanel cards, JTextField, textField1, JLabel, label1;
final static String EXECUTIVEPANEL = "1.EXECUTIVE";
final static String HOURLYPANEL = "2.HOURLY WORKER";
public void addComponentToPane(Container pane)
*//Put the JComboBox in a JPanel to get a nicer look.*
JPanel comboBoxPane = new JPanel(); //use FlowLayout
JPanel userNameAndPasswordPane = new JPanel();
*// User Name JLabel and JTextField*
userNameAndPasswordPane.add(new JLabel("NAME"));
JTextField textField1 = new JTextField(25);
userNameAndPasswordPane.add(textField1);
*String comboBoxItems[] = { EXECUTIVEPANEL, HOURLYPANEL };*
JComboBox cb = new JComboBox(comboBoxItems);
cb.setEditable(false);
cb.addItemListener(this);
comboBoxPane.add(cb);
*//Create the "cards".*
JPanel card1 = new JPanel();
card1.add(new JLabel("WEEKLY SALARY"));
card1.add(new JTextField(6));
card1.add(new JLabel("TOTAL PAY"));
card1.add(new JTextField(8));
card1.add(new JButton("CALCULATE"));
JPanel card2 = new JPanel();
card2.add(new JLabel("HOURLY SALARY"));
card2.add(new JTextField(6));
card2.add(new JLabel("TOTAL HOURS WORK"));
card2.add(new JTextField(8));
card2.add(new JButton("CALCULATE"));
*//Create the panel that contains the "cards".*
cards= new JPanel(new CardLayout());
cards.add(card1, EXECUTIVEPANEL);
cards.add(card2, HOURLYPANEL);
pane.add(comboBoxPane, BorderLayout.PAGE_START);
pane.add(userNameAndPasswordPane, BorderLayout.CENTER);
pane.add(cards, BorderLayout.PAGE_END);
public void itemStateChanged(ItemEvent evt)
CardLayout cl = (CardLayout)(cards.getLayout());
cl.show(cards, (String)evt.getItem());
** GUI created*
*private static void createAndShowGUI() {*
*//Make sure we have nice window decorations.*
JFrame.setDefaultLookAndFeelDecorated(true);
*//Create and set up the window.*
JFrame frame = new JFrame("GUI PAY CALCULATOR");
frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
*//Create and set up the content pane.*
PayrollSystem demo = new PayrollSystem();
demo.addComponentToPane(frame.getContentPane());
*//Display the window.*
frame.pack();
frame.setVisible(true);
*public static void main(String[] args) {*
*//Schedule a job for the event-dispatching thread:*
*//creating and showing this application's GUI.*
*javax.swing.SwingUtilities.invokeLater(new Runnable() {*
*public void run() {*
createAndShowGUI();
HOW CAN I PERFORM THE SWITCH STATEMENT INSIDE THIS CODE TO LET IT FULLY FUNCTIONAL..?
I MUST PERFORM THE SWITCH STATEMENT LIKE IN THE QUESTION..
PLEASE HELP ME..REALLY APPRECIATED...TQ

hi
A switch works with the byte, short, char, and int primitive data types. So you can simply give the
switch (month) {
            case 1:
                        System.out.println("January");
                        break;
            case 2: {
                        System.out.println("February");
                         break;
            case 3: {
                          System.out.println("March");
                          break;
                         }where month controlls the flow
moreover u can go to http://www.java-samples.com/java/free_calculator_application_in_java.htm
for reference, just replace the if statement with switch with correct syntax

Help with switch statement

Hello I have a copy of my code below. Everything compiles fine its just when the code gets to the switch statement I get an error saying
Exception in thread "main" java.util.InputMismatchException
at java.util.Scanner.throwFor(Scanner.java:819)
at java.util.Scanner.next(Scanner.java:1431)
at java.util.Scanner.nextInt(Scanner.java:2040)
at java.util.Scanner.nextInt(Scanner.java:2000)
at Sample.main(Sample.java:55)
Something is not working right when the user enters an integer expression. what can I do to fix this?
import java.util.*;
import java.io.*;
// Declare a public class
public class Sample {
     public static void main (String[] args){
     //Declare Variables
     float float0, float1;
     int int0, int1;
     String mathSign;
     char charMathSign;
     Scanner sc = new Scanner(System.in);
     //Ask user to Enter FLoating-Point Number Expression
     System.out.println("Enter a simple floating-point expression: ");
     float0 = sc.nextFloat();
     mathSign = sc.next ();
     float1 = sc.nextFloat();
     if(mathSign.equals("+"))
     System.out.println(float0 + " + " + float1 + " = " + (float0 + float1));
     else if(mathSign.equals("-"))
     System.out.println(float0 + " - " + float1 + " = " + (float0 - float1));
     else if(mathSign.equals("*"))
     System.out.println(float0 + " * " + float1 + " = " + (float0 * float1));
     else if(mathSign.equals("/"))
     System.out.println(float0 + " / " + float1 + " = " + (float0 / float1));
     //Ask the user to enter a simple floating point expression
     System.out.println("Enter a simple integer expression: ");
     int0 = sc.nextInt ();
     charMathSign = mathSign.charAt(0);
     int1 = sc.nextInt ();
     switch (charMathSign)
          case '+': System.out.println(int0 + " + " + int1 + " = " + (int0 + int1));
          break;
          case '-': System.out.println(int0 + " - " + int1 + " = " + (int0 - int1));
          break;
          case '*': System.out.println(int0 + " * " + int1 + " = " + (int0 * int1));
          break;
          case '/': System.out.println(int0 + " / " + int1 + " = " + (int0 / int1));
          break;
[/code]

{color:#000080}Duplicate posting, please post all responses at{color}{color:#0000ff}
http://forum.java.sun.com/thread.jspa?threadID=5219239{color}{color:#000080}
db{color}

How to convert switch statement into iif than else statement in SSRS

Hi All;
How do i convert switch statement into iif statement in ssrs
=
Switch(
Fields!createdonValue.Value = Now(), "Today",
Fields!createdonValue.Value = DateAdd("d",-1,Today()),"Yesterday",
Fields!createdonValue.Value >= FORMATDATETIME(DateAdd(DateInterval.Day, -6,DateAdd(DateInterval.Day, 1-Weekday(today),Today)),DATEFORMAT.ShortDate) and
Fields!createdonValue.Value <= FORMATDATETIME(DateAdd(DateInterval.Day, -0,DateAdd(DateInterval.Day, 1-Weekday(today),Today)),DATEFORMAT.ShortDate),"Last Week",
Fields!createdonValue.Value >= FORMATDATETIME(DateAdd(DateInterval.Day, -13,DateAdd(DateInterval.Day, 1-Weekday(today),Today)),DATEFORMAT.ShortDate) and
Fields!createdonValue.Value <= FORMATDATETIME(DateAdd(DateInterval.Day, -0,DateAdd(DateInterval.Day, 1-Weekday(today),Today)),DATEFORMAT.ShortDate),"Last Fortnight",
Fields!createdonValue.Value >= DateValue(DateAdd("M",-1,DateAdd("D",-(Day(Now)-1),Now))) and
Fields!createdonValue.Value <= DateValue(DateAdd("D",-1,DateAdd("D",-(Day(Now)-1),Now))),"Last Month",
Fields!createdonValue.Value >= DateSerial(Year(Now()), 1, 1) and
Fields!createdonValue.Value <= DateSerial(Year(Now()), 12, 31),"Year to Date"
Any help much appreciated
Thanks
Pradnya07

Not sure why you want to se IIF as Switch is more compact
Anyways it will look like this
=IIf(
Fields!createdonValue.Value = Now(), "Today",IIf(
Fields!createdonValue.Value = DateAdd("d",-1,Today()),"Yesterday",Iif(
Fields!createdonValue.Value >= FORMATDATETIME(DateAdd(DateInterval.Day, -6,DateAdd(DateInterval.Day, 1-Weekday(today),Today)),DATEFORMAT.ShortDate) and
Fields!createdonValue.Value <= FORMATDATETIME(DateAdd(DateInterval.Day, -0,DateAdd(DateInterval.Day, 1-Weekday(today),Today)),DATEFORMAT.ShortDate),"Last Week",IIf(
Fields!createdonValue.Value >= FORMATDATETIME(DateAdd(DateInterval.Day, -13,DateAdd(DateInterval.Day, 1-Weekday(today),Today)),DATEFORMAT.ShortDate) and
Fields!createdonValue.Value <= FORMATDATETIME(DateAdd(DateInterval.Day, -0,DateAdd(DateInterval.Day, 1-Weekday(today),Today)),DATEFORMAT.ShortDate),"Last Fortnight",IIf(
Fields!createdonValue.Value >= DateValue(DateAdd("M",-1,DateAdd("D",-(Day(Now)-1),Now))) and
Fields!createdonValue.Value <= DateValue(DateAdd("D",-1,DateAdd("D",-(Day(Now)-1),Now))),"Last Month",IIf(
Fields!createdonValue.Value >= DateSerial(Year(Now()), 1, 1) and
Fields!createdonValue.Value <= DateSerial(Year(Now()), 12, 31),"Year to Date")))))
Please Mark This As Answer if it helps to solve the issue Visakh ---------------------------- http://visakhm.blogspot.com/ https://www.facebook.com/VmBlogs

Use of boolean variables in BPEL switch statements

I have a workflow with a single boolean input parameter:
<element name="input" type="boolean"/>
I wish to use a switch statement within the workflow, based on the value of that boolean parameter.
When I use the following XPath expression:
bpws:getVariableData("input","payload","/tns:BooleanRequest/tns:input")
I get the correct functionality, although I get the following BPEL compiler warning:
" [bpelc] [Warning ORABPEL-10078]: return value of this expression may not be a boolean
[bpelc] [Description]: in line 35 of "C:\eclipse\workspace\Boolean\Boolean.bpel", xpath expression "bpws:getVariableData("input","payload","/tns:BooleanRequest/tns:input")" used in <switch> may not return boolean type value, the xpath engine would automatically try to convert the return value to boolean..
[bpelc] [Potential fix]: Please use one of the built-in boolean functions from xpath http://www.w3.org/TR/xpath#section-Boolean-Functions to convert the return value to boolean.."
However, the boolean functions referenced do not appear to be relevant to a variable which is already of a boolean type. If I attempt to use the boolean() function in my XPath expression, I get rid of the compiler error, but the workflow now does not work as required.
How can I get rid of the compiler warning and still get the required functionality, and/or am I doing the wrong thing?
I am currently running on JBoss, with BPEL release 2.1.2 [build #1226].
Thanks for any help or ideas.

Hi Marlon,
Thanks for that - I guess we have to accept the vagaries of XPath and the absence of type-checking for variables.
I hadn't fully understood until I started investigating that I can assign ANY string to variable of type xsd:boolean, which has been the cause of some of the confusion for me - whether that value is then considered true or false depends on how you write your test condition.
I tried with your condition, and it didn't seem to work (evaluated to true if the variable data was the string "true()", but otherwise it seemed to always evaluate to false.
I also tried the following:
condition="bpws:getVariableData('booleanVariable')=true()"
but that evaluates to true for any string of length > 0.
The only one I can get to consistently work is:
condition="bpws:getVariableData('booleanVariable')=string(true())"
although that means that variable data of "TRUE" will evaluate to false (may well be the correct behaviour, depending on how you're setting the boolean variable in the first place).

Switch Statement again

I am new to Java and am trying to learn how to use and understand the nuances involved in using the Switch statment.
Yesterday, I received tremendous help, As a result, I am closer to understanding the switch statement and how it works.
My program is designed to use 5 different input boxes. These represent a total for quizzes, homework assignments, 2 midterms, and a final exam.
These are casted to double; then, they are added together and divided by five to obtain an average (the student's GPA). The GPA is then going to assigned a grade depending up the range in the If then statement.
I intend on using a message box to inform the user of the GPA and another followed by another message box to show them their grade.
I would like to incorporate the switch statement (so I can learn how to use it) to show them their grade.
I know the code needs tweaking but this is what I have so far:
import javax.swing.JOptionPane;
public class Switchgrade{
//declaration of class
public static void main(String args[])
//declaration of main
String midone; String midtwo; String quiz; String homework; //declares variables to hold the grades, quiz and homework scores
String last;
double one; //first midterm
double two; //second midterm
double three;double four; double five; //final, quiz and homework scores
double average; //GPA
char a; char b; char c; char d; char f;char grade;
midone = JOptionPane.showInputDialog("Please enter the first midterm"); //first score to add
one = Double.parseDouble(midone);
midtwo = JOptionPane.showInputDialog("please enter second midterm"); //second midterm to add
two = Double.parseDouble(midtwo);
last = JOptionPane.showInputDialog("please enter final exam score");//final exam score to add
three = Double.parseDouble(last);
quiz = JOptionPane.showInputDialog("please enter quiz score");//quiz score to add
four = Double.parseDouble(quiz);
homework= JOptionPane.showInputDialog("please enter homework score");//homework score to add
five = Double.parseDouble(homework);
average = (one + two+ three + four + five)/5; //average of all five scores
if(average >= 90)
grade = 'a';
else
if(average >= 80 )
grade = 'b';
switch (grade)
case a:
JOptionPane.showMessageDialog(null,"The total of all your scores is " + b+"\nYour final grade is an A");
break;
default:
JOptionPane.showMessageDialog(null,"Sorry, you received a grade of " + b + ". \nYou failed.");
break;
System.exit(0);
}//end of main
}//end of class
As you can see, I am only using two grades, just so I can learn to use it. However, when I go to compile this, I get this error message:
constant expression required: case a:, with the ^ under the a.
What does this error message me and how do I fix this.
Thanks in advance for your help.

case a:is trying to use a variable with the name "a" for the comparison. This is illegal in java
what you want is
case 'a':this will do a comparison against the char value 'a'

Switch Statement

I am new to Java and am trying to learn how to use and understand the nuances involved in using the Switch statment.
I am trying to write an application that will calculate grades for a student. I can use the If Then Else Control structure for this (which runs) but I would like to incorporate the Switch Statement in place of the multiple if then else structure. Here is the code that I have for the application:
import javax.swing.JOptionPane;
public class Switchgrades
public static void main(String args[])
String midone; String midtwo; String quiz; String homework;
String last;
double one; //first midterm
double two; //second midterm
double three;double four; double five; //final, quiz and homework scores
double average; //GPA
int a; int b; double c; double d; double f;int grade;
midone = JOptionPane.showInputDialog("Please enter the first midterm"); //first score to add
one = Double.parseDouble(midone);
midtwo = JOptionPane.showInputDialog("please enter second midterm"); //second midterm to add
two = Double.parseDouble(midtwo);
last = JOptionPane.showInputDialog("please enter final exam score");//final exam score to add
three = Double.parseDouble(last);
quiz = JOptionPane.showInputDialog("please enter quiz score");//quiz score to add
four = Double.parseDouble(quiz);
homework= JOptionPane.showInputDialog("please enter homework score");//homework score to add
five = Double.parseDouble(homework);
average = (one + two+ three + four + five)/5; //average of all five scores
switch (grade)
case a: //this is where I become confused and lost. I don't what I need to do to make it run.
{if(average >= 90)
b = Integer.parseInt(average);
JOptionPane.showMessageDialog(null,"The total of all your scores is " + b+"\nYour final grade is an A");}
/ I am just using one choice to make it run. When I can make it run, I plan on incorporating the other grades.
break;
<=====================================================================>
<=====================================================================>
//else --->this is part of the if that works in another program
// if(average >= 80 )
// JOptionPane.showMessageDialog(null,"The total of all your scores is " + average +"\nYour final grade is a B");
//else
//if(average >= 70 )
// JOptionPane.showMessageDialog(null,"The total of all your scores is " + average +"\nYour final grade is a C");
//else
//if(average >= 60 )
// JOptionPane.showMessageDialog(null,"The total of all your scores is " + average +"\nYour final grade is a D");
//else
//if(average <= 60 )
<=====================================================================>
<=====================================================================>
default:
JOptionPane.showMessageDialog(null,"Sorry, you received a grade of " + average + ". \nYou failed.");
System.exit(0);
As you can see, I already have all the if then else statements set up--between the <==>. The program runs with the If's but I can two error messages when I incorporate the Switch statement.
1) constant expression required.
I have case a and i guess it is not a constant. Again, I don't understand switch well enough to figure what I need to do to correct it.
2)"b = Integer.parseInt(average);" - cannot resolve the symbol--whatever that means. I have a "^" pointing at the period between Integer and parseInt.
Can anyone help explain what I have to do to make this program work using Switch.
I have not used Switch before and don't understand what I can use as opposed to what I must use for it to work.
Thanks for your help.

I don't really know how you want your program going, but here is what I think.
1) From the start of the switch statement, where do you assign the value for "grade"? If you write the switch statement like below, you meant something like, if(grade == 'a'){...}, right!? Then, where did you get the "grade" from?
switch (grade)
case a:
You may want declare variable "grade" as char and place if sentence like this before the switch.
if(average >= 90)
grade = 'a';
else if(average >= 70)
grade = 'b';
switch (grade)
case a:
System.out.print("Your grade: A");
break;
case b:
System.out.print("Your grade: A");
break;
Is that What you want???
2)The method, Integer.parseInt(), takes String as parameter? Did you override this method? The variable "average" was declare as double, so why don't you just cast it to int??

Using a Switch statement for Infix to Prefix Expressions

I am stuck on the numeric and operator portion of the switch statement...I have the problem also figured out in an if/else if statement and it works fine, but the requirements were for the following algorithm:
while not end of expression
switch next token of expression
case space:
case left parenthesis:
skip it
case numeric:
push the string onto the stack of operands
case operator:
push the operator onto the stack of operators
case right parenthesis:
pop two operands from operand stack
pop one operator from operator stack
form a string onto operand stack
push the string onto operand stack
pop the final result off the operand stack
I know that typically case/switch statement's can only be done via char and int's. As I said I am stuck and hoping to get some pointers. This is for a homework assignment but I am really hoping for a few pointers. I am using a linked stack class as that was also the requirements. Here is the code that I have:
   import java.io.*;
   import java.util.*;
   import java.lang.*;
/*--------------------------- PUBLIC CLASS INFIXTOPREFIX --------------------------------------*/
/*-------------------------- INFIX TO PREFIX EXPRESSIONS --------------------------------------*/
    public class infixToPrefix {
      private static LinkedStack operators = new LinkedStack();
      private static LinkedStack operands = new LinkedStack();
        // Class variable for keyboard input
      private static BufferedReader stdin = new BufferedReader(new InputStreamReader(System.in));
         // Repeatedly reads in infix expressions and evaluates them
       public static void main(String[] args) throws IOException {
      // variables
         String expression, response = "y";
      // obtain input of infix expression from user
         while (response.charAt(0) == 'y') {
            System.out.println("Enter a parenthesized infix expression.");          // prompt the user
            System.out.println("Example: ( ( 13 + 2 ) * ( 10 + ( 8 / 3 ) ) )");
            System.out.print("Or as: ((13+2)*(10+(8/3))): ");
            expression = stdin.readLine();     // read input from the user
         // output prefix expression and ask user if they would like to continue
            System.out.println("The Prefix expression is: " + prefix(expression));     // output expression
            System.out.println("Evaluate another? y or n: ");          // check with user for anymore expressions
            response = stdin.readLine();     // read input from user
            if (response.charAt(0) == 'n') {          // is user chooses n, output the statement
               System.out.println("Thank you and have a great day!");
            }     // end if statement
         }     // end while statement
      }     // end method main
   /*------------- CONVERSION OF AN INFIX EXPRESSION TO A PREFIX EXPRESSION ------------*/
   /*--------------------------- USING A SWITCH STATEMENT ------------------------------*/
       private static String prefix(String expression) {
            // variables
         String symbol, operandA, operandB, operator, stringA, outcome;
           // initialize tokenizer
         StringTokenizer tokenizer = new StringTokenizer(expression, " +-*/() ", true);
         while (tokenizer.hasMoreTokens()) {
            symbol = tokenizer.nextToken();     // initialize symbol
            switch (expression) {
               case ' ':
                  break;     // accounting for spaces
               case '(':
                  break;     // skipping the left parenthesis
               case (Character.isDigit(symbol.charAt(0))):      // case numeric
                  operands.push(symbol);                                   // push the string onto the stack of operands
                  break;
               case (!symbol.equals(" ") && !symbol.equals("(")):     // case operator
                  operators.push(symbol);                                             // push the operator onto the stack of operators
                  break;
               case ')':
                  operandA = (String)operands.pop();     // pop off first operand
                  operandB = (String)operands.pop();     // pop off second operand
                  operator = (String)operators.pop();     // pop off operator
                  stringA = operator + " " + operandB + " " + operandA;          // form the new string
                  operands.push(stringA);
                  break;
            }     // end switch statement
         }     // end while statement
         outcome = (String)operands.pop();     // pop off the outcome
         return outcome;     // return outcome
      }     // end method prefix
   }     // end class infixToPrefixAny help would be greatly appreciated!

so, i did what flounder suggested:
         char e = expression.charAt(0);
         while (tokenizer.hasMoreTokens()) {
            symbol = tokenizer.nextToken();     // initialize symbol
            switch (e) {
               case ' ':
                  break;     // accounting for spaces
               case '(':
                  break;     // skipping the left parenthesis
               case '0':
               case '1':
               case '2':
               case '3':
               case '4':
               case '5':
               case '6':
               case '7':
               case '8':
               case '9':
                  operands.push(symbol);     // push the string onto the stack of operands
                  break;                               // case numeric
               case '+':
               case '-':
               case '*':
               case '/':
                  operators.push(symbol);     // push the operator onto the stack of operators
                  break;                               // case operator
               case ')':
                  operandA = (String)operands.pop();     // pop off first operand
                  operandB = (String)operands.pop();     // pop off second operand
                  operator = (String)operators.pop();     // pop off operator
                  stringA = operator + " " + operandB + " " + operandA;          // form the new string
                  operands.push(stringA);
                  break;
               default:
            }     // end switch statement
         }     // end while statement
         outcome = (String)operands.pop();     // pop off the outcome
         return outcome;     // return outcomeafter this, I am able to compile the code free of errors and I am able to enter the infix expression, however, the moment enter is hit it provides the following errors:
Exception in thread "main" java.lang.NullPointerException
     at LinkedStack$Node.access$100(LinkedStack.java:11)
     at LinkedStack.pop(LinkedStack.java:44)
     at infixToPrefix.prefix(infixToPrefix.java:119)
     at infixToPrefix.main(infixToPrefix.java:59)
Any ideas as to why? I am still looking through seeing if I can't figure it out, but any suggestions? Here is the linked stack code:
    public class LinkedStack {
   /*--------------- LINKED LIST NODE ---------------*/
       private class Node {
         private Object data;
         private Node previous;
      }     // end class node
   /*-------------- VARIABLES --------------*/
      private Node top;
/*-- Push Method: pushes object onto LinkedStack --*/
       public void push(Object data) {
         Node newTop = new Node();
         newTop.data = data;
         newTop.previous = top;
         top = newTop;
      }     // end function push
   /*--- Pop Method: pop obejct off of LinkedStack ---*/
       public Object pop()      {
         Object data = top.data;
         top = top.previous;
         return data;
      }     // end function pop
   } // end class linked stackEdited by: drmsndrgns on Mar 12, 2008 8:10 AM
Edited by: drmsndrgns on Mar 12, 2008 8:14 AM
Edited by: drmsndrgns on Mar 12, 2008 8:26 AM

Switch statement help!!

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