Reading variable from another class

If you have two java classes both inside the same java package.
And you declared a variable for example
String bob;
bob = "hello world?"How would you make it so that the other file could then output this value
System.out.print(bob);Would you have to make the variable public and then something else?

Are you working with a main and subclass then?
Why not just write a String method and use it from the main class
public String string()
String bob = "Hello word"
return bob;
Then in your main class just create a object of the subclass
Subclass obj = new Subclass();
The just use System.out.println(obj.string());
i guess this would work also....?

Similar Messages

Using a variable from another class

hello friends, I have a class with the follow variable: dbcolTempMax, and the value of this variable I need in another class, how can do to use the value of the variable...thanks

Both people above described the solution, but from the question I take it you are somewhat new to programming. Let me give you a code example which may help.
     public class ClassWithVariable {
          private int dbcolTempMax;
          public int getDbcolTempMax() {
               return dbcolTempMax;
     public class SomeOtherClass {
          ClassWithVariable cwv = new ClassWithVariable();
          cwv.getDbcolTempMax(); // This gets the value of the variable
     }Now if the variable is static, you can provide a static "accessor" method to ge the variable. This will save you the trouble of constructing an object of the class.
Cheers,
Cypher

How to get variable from another class?

I have 2 classes. In first I have int variable. In second class I need to get this variable value. How I can make it?
import javax.microedition.lcdui.*;
import java.io.*;
import java.util.*;
public class ChooseLessons extends Form implements CommandListener, ItemStateListener
     ChoiceGroup lessons;     // Choice Group of preferences
     Dictionary     dictionary;
     int volumeSize;
     ChooseLessons(Dictionary dictionary)
          int volumeSize = 15;
     public void commandAction(Command c, Displayable s)
          if (c == Dictionary.BEGIN_CMD) {
               new TeachForm(dictionary, this);
import javax.microedition.lcdui.*;
import java.util.*;
public class TeachForm extends Form implements CommandListener
     Dictionary               dictionary;
     ChooseLessons          lessons;
     TeachForm(Dictionary dictionary, ChooseLessons lessons) {
          super(Locale.WORD);
          this.dictionary = dictionary;
          this.lessons = lessons;
          lessons.volumeSize(); // HERE I NEED VARIABLE VALUE FROM PREVIOUS CLASS
}Edited by: Djanym on Mar 16, 2009 4:43 PM

This is a classic problem that coders run into when trying to get their head around object-oriented programing. Since you have a class that should be modeled after a real world object, as far as that object is concerned, no one else needs to know the details of it - without asking nicely. This is where you should set up some getters and setters, which are methods that allow fields in a class to reveal themselves or allow their states to be changed in a orderly fashion.
There are a number of fields that never need to be known outside of the class. Then there are some fields you would like to let people know about, but don't want them to have the ability to change them. In the example below, there are to getter methods allow return of the necessary fields. If you made these public, there is a possibility that someone utilizing this field may change it outside of its intended use, or access them without them being ready for public consumption.
Class test {
//These private variables are only visible from the class
private int grade1 = 0;
private int grade2 = 0;
private int grade3 = 0;
private float average = 0;
private int gradeboost = 0;
//This method sets the gradeboost field to one desired by the instructor
void setboost(int boost) {
gradeboost = boost;
//These methods accept test scores and compute the average for three test
//Notice that the calculated average may not be the true average of the three test scores
//because of the possibility of gradeboost calculation being greater than 1
void test1(int score) {
         grade1 = score;
         average = (grade1 + grade2 + grade3 + gradeboost)/3;
void test2(int score) {
         grade2 = score;
         average = (grade1 + grade2 + grade3 + gradeboost)/3;
void test3(int score) {
         grade3 = score;
         average = (grade1 + grade2 + grade3 + gradeboost)/3;
//This is a getter method, which provides read access to the private variable average
//If someone just had public access to the grades and wanted to take their own average
//They would miss how the gradeboost field affects the final outcome.
float getAverage() {
    return average;
//Here is a getter method, which accepts an argument to determine which test score to return
//Notice that this isn't the true testscore, but it has been modified by the gradeboost field.
//If the user had public access to the true testscore, it wouldn't take into account the gradeboost calculation!!
//This is how a getter can control exactly what a user has access to.
float get testScore(int test) {
float testresult = 0;
if (test = 1) {
       testresult = (grade1+ gradeboost) / 3;
if (test = 2) {
       testresult = (grade2+ gradeboost) / 3;
if (test = 3) {
       testresult = (grade3+ gradeboost) / 3;
return testresult;
}

How can I call a variable from another class

hi
If I have two classes : one and two
In class two I have a variable called : action
In class one I want to check what is the value of action.
How can I call action?

Thank you scorbett
what you told me worked fine, but my problem is that MyClass2 is an application by itself that I don't want to be executed.
Creating myClass2 as in the following:
MyClass2 myClass2 = new MyClass2();
[/code]
executes myClass2.
Can I prevent the exectuion of MyClass2, or is there another way to call the variable (action)?

Accessing variable from another class

Say I want to access String ABC from class XYZ from my main class. I have already created the object for the class I just don't know the syntax for accessing the variable.
This is just an example. I figured this is just a problem of finding the right syntax so I didn't bother creating a compiling code.
public class test{
public static void main(String[]args){
     XYZ xyz = new XYZ ();
     String a = abc.XYZ(); // this is where i want to directly access the variable abc. i know this isn't correct and it's what im trying to find out how to do.
public class XYZ{
     String abc = "hi";
}Edited by: aznprdgy on Nov 3, 2009 2:13 PM

No, that isn't possible.
abc is said to be a local variable. And it's only useable within method().
It's part of the job of the class Xyz to control the access to its state. As an example:
public class Test {
    public static void main(String[] args) {
        Xyz xyz = new Xyz()
        String a = xyz.getSpecialValue();
public class Xyz {
    private String a;
    public String getSpecialValue() {
        return a;
    public void method() {
        a = "hi";
}Note that a won't be reference to the string "hi" until after method() has been called.

How to call a variable from another class?

Greetings
I�m designing a program that is called Senior.java, and I want to design it�s menus, for simplicity in reading the code, I want to write a separate java file for each menu. For example I want a file.java, edit.java etc�.
Since I�m not a professional I�m having problems in calling the variable �bar�, that I created in senior.java,
In Senior.java I have :
JMenuBar bar = new JMenuBar();
setJMenuBar( bar );
In fileMenu.java I want to add file menu to the menu bar �bar�:
bar.add( fileMenu );
When I compile the fileMenu.java I got a �cannot resolve symbol � message, where symbol is the variable bar.
Can you please help me, knowing that i'm using SDK1.4.1?

Sun has recommendations for naming conventions. Class names should start with a capital letter. You should avoid using class names that are the same as classes provided in the SDK. Following these conventions will make it easier for people to help you. For example, you should not use file, nor should you use File. It's better to use MyFile, replacing My with something that makes sense to your application (SeniorFile?).
Also, check the Formatting Help link when posting for a desciption on how to use the code tags for posting code.
1. You need to establish references between your classes. One way is to have a constructor that has a JMenuBar argument.
2. You can not add a file to a JMenuBar because a JMenuBar adds a JMenu. I don't think you want file to extend JMenu. It may be better for file to have a JMenu.
I haven't tried to compile this code so no guarantees - just trying to show you an approach.
public class Senior extends JFrame {
   public Senior() {
      JMenuBar bar = new JMenuBar();
      MyFile file = new MyFile(bar);
//whatever else you need
public class MyFile {
   public MyFile(JMenuBar mbar) {
      JMenu menu = new JMenu();
      mbar.add(menu);

Getting a variable value from another class

Is there any way to get the value of a variable from another class? I have a file that calls another that does some checking then gives a true or false. The place the checking is done is inside an ActionListener I want to use that value in the file that calls the second. Any help would be great.

in 'another class', implement a method,
public boolean isCheckedOutOK( Object obj )
do the comparison in that method (use a suitable argument)

Accessing public variables from other classes

Probably a simple questions, but how can I access a variable from another class. My exact situation is as follows.
A class called WorldCalender has a variable which is defined: public int hour; (the value is given to it elsewhere).
I want to access this variable and increase it by one in a subroutine in the class Hour. In this class I have put: WorldCalender.hour++; but it doesn't seem to work. How should I do it?

don't expose the hour variable at all.
have a method eg addToHourBy( int hrs )
Probably a simple questions, but how can I access a
variable from another class. My exact situation is as
follows.
A class called WorldCalender has a variable which is
defined: public int hour; (the value is given to it
elsewhere).
I want to access this variable and increase it by one
in a subroutine in the class Hour. In this class I
have put: WorldCalender.hour++; but it doesn't seem to
work. How should I do it?

How to pass a variable from one class to another class?

Hi,
Is it possible to pass a variable from one class to another? For e.g., I need the value of int a for calculation purpose in method doB() but I get an error <identifier> expected. What does the error mean? I know, it's a very, very simple question but once I learn this, I promise to remember it forever. Thank you.
class A {
int a;
int doA() {
      a = a + 1;
      return a;
class B {
int b;
A r = new A();
r.a; // error: <identifier> expected. What does that mean ?
int doB() {
     int c = b/a; // error: operator / cannot be applied to a
}Thank you!

elaine_g wrote:
I am wondering why does (r.a) give an error outside the method? What's the reason it only works when used inside the (b/r.a) maths function? This is illegal syntax:
class B {
int b;
A r = new A();
r.a; //syntax error
}Why? Class definition restricts what you can define within a class to a few things:
class X {
    Y y = new Y(); //defining a field -- okay
    public X() { //defining a constructor -- okay
    void f() { //defining a method -- okay
}... and a few other things, but you can't just write "r.a" there. It also makes no sense -- that expression by itself just accesses a field and does nothing with it -- why bother?
This is also illegal syntax:
int doB() {
      A r = new A();
      r.a; // error: not a statement
}Again, all "r.a" does on its own is access a field and do nothing with it -- a "noop". Since it has no effect, writing this indicates confusion on the part of the coder, so it classified as a syntax error. There is no reason to write that.

Accessing a variable defined in one class from another class..

Greetings,
I've only been programming in as3 for a couple months, and so far I've written several compositional classes that take MovieClips as inputs to handle behaviors and interactions in a simple game I'm creating. One problem I keep coming upon is that I'd love to access the custom variables I define within one class from another class. In the game I'm creating, Main.as is my document class, from which I invoke a class called 'Level1.as' which invokes all the other classes I've written.
Below I've pasted my class 'DieLikeThePhishes'. For example, I would love to know the syntax for accessing the boolean variable 'phish1BeenHit' (line 31) from another class. I've tried the dot syntax you would use to access a MovieClip inside another MovieClip and it doesn't seem to be working for me. Any ideas would be appreciated. Thanks,
- Jeremy
package jab.enemy
import flash.display.MovieClip;
import flash.events.Event;
import jab.enemy.MissleDisappear;
public class DieLikeThePhishes
private var _clip2:MovieClip; // player
private var _clip3:MovieClip; //phish1
private var _clip4:MovieClip; //phish2
private var _clip5:MovieClip; //phish3
private var _clip6:MovieClip; //phish4
private var _clip10:MovieClip; // background
private var _clip11:MovieClip // missle1
private var _clip12:MovieClip // missle2
private var _clip13:MovieClip // missle3
private var _clip14:MovieClip // missle4
private var _clip15:MovieClip // missle5
private var _clip16:MovieClip // missle6
private var _clip17:MovieClip // missle7
private var _clip18:MovieClip // missle8
private var _clip19:MovieClip // missle9
private var _clip20:MovieClip // missle10
private var _clip21:MovieClip // missle11
private var _clip22:MovieClip // missle12
var ay1 = 0;var ay2 = 0;var ay3 = 0;var ay4 = 0;
var vy1 = 0;var vy2 = 0;var vy3 = 0;var vy4 = 0;
var phish1BeenHit:Boolean = false;var phish2BeenHit:Boolean = false;
var phish3BeenHit:Boolean = false;var phish4BeenHit:Boolean = false;
public function DieLikeThePhishes(clip2:MovieClip,clip3:MovieClip,clip4:MovieClip,clip5:MovieClip,clip6:M ovieClip,clip10:MovieClip,clip11:MovieClip,clip12:MovieClip,clip13:MovieClip,clip14:MovieC lip,clip15:MovieClip,clip16:MovieClip,clip17:MovieClip,clip18:MovieClip,clip19:MovieClip,c lip20:MovieClip,clip21:MovieClip,clip22:MovieClip)
_clip2 = clip2;_clip3 = clip3;_clip4 = clip4;_clip5 = clip5;_clip6 = clip6;
_clip10 = clip10;_clip11 = clip11;_clip12 = clip12;_clip13 = clip13;_clip14 = clip14;
_clip15 = clip15;_clip16 = clip16;_clip17 = clip17;_clip18 = clip18;_clip19 = clip19;
_clip20 = clip20;_clip21 = clip21;_clip22= clip22;
_clip3.stage.addEventListener(Event.ENTER_FRAME, onEnterFrame)
function onEnterFrame(event:Event):void
vy1+= ay1;_clip3.y += vy1; vy2+= ay2;_clip4.y += vy2;
vy3+= ay3;_clip5.y += vy3; vy4+= ay4;_clip6.y += vy4;
if (phish1BeenHit ==false)
if(_clip3.y >620)
{_clip3.y = 620;}
if (phish2BeenHit ==false)
if(_clip4.y >620)
{_clip4.y = 620;}
if (phish3BeenHit ==false)
if(_clip5.y >620)
{_clip5.y = 620;}
if (phish4BeenHit ==false)
if(_clip6.y >620)
{_clip6.y = 620;}
if (_clip11.hitTestObject(_clip3) ||_clip12.hitTestObject(_clip3)||_clip13.hitTestObject(_clip3)||_clip14.hitTestObject(_cl ip3)||_clip15.hitTestObject(_clip3)||_clip16.hitTestObject(_clip3)||_clip17.hitTestObject( _clip3)||_clip18.hitTestObject(_clip3)||_clip19.hitTestObject(_clip3)||_clip20.hitTestObje ct(_clip3)||_clip21.hitTestObject(_clip3)||_clip22.hitTestObject(_clip3))
_clip3.scaleY = -Math.abs(_clip3.scaleY);
_clip3.alpha = 0.4;
ay1 = 3
vy1= -2;
phish1BeenHit = true;
if (_clip11.hitTestObject(_clip4) ||_clip12.hitTestObject(_clip4)||_clip13.hitTestObject(_clip4)||_clip14.hitTestObject(_cl ip4)||_clip15.hitTestObject(_clip4)||_clip16.hitTestObject(_clip4)||_clip17.hitTestObject( _clip4)||_clip18.hitTestObject(_clip4)||_clip19.hitTestObject(_clip4)||_clip20.hitTestObje ct(_clip4)||_clip21.hitTestObject(_clip4)||_clip22.hitTestObject(_clip4))
_clip4.scaleY = -Math.abs(_clip4.scaleY);
_clip4.alpha = 0.4;
ay2 = 3
vy2= -2;
phish2BeenHit = true;
if (_clip11.hitTestObject(_clip5) ||_clip12.hitTestObject(_clip5)||_clip13.hitTestObject(_clip5)||_clip14.hitTestObject(_cl ip5)||_clip15.hitTestObject(_clip5)||_clip16.hitTestObject(_clip5)||_clip17.hitTestObject( _clip5)||_clip18.hitTestObject(_clip5)||_clip19.hitTestObject(_clip5)||_clip20.hitTestObje ct(_clip5)||_clip21.hitTestObject(_clip5)||_clip22.hitTestObject(_clip5))
_clip5.scaleY = -Math.abs(_clip5.scaleY);
_clip5.alpha = 0.4;
ay3 = 3
vy3= -2;
phish3BeenHit = true;
if (_clip11.hitTestObject(_clip6) ||_clip12.hitTestObject(_clip6)||_clip13.hitTestObject(_clip6)||_clip14.hitTestObject(_cl ip6)||_clip15.hitTestObject(_clip6)||_clip16.hitTestObject(_clip6)||_clip17.hitTestObject( _clip6)||_clip18.hitTestObject(_clip6)||_clip19.hitTestObject(_clip6)||_clip20.hitTestObje ct(_clip6)||_clip21.hitTestObject(_clip6)||_clip22.hitTestObject(_clip6))
_clip6.scaleY = -Math.abs(_clip6.scaleY);
_clip6.alpha = 0.4;
ay4 = 3
vy4= -2;
phish4BeenHit = true;
if (_clip3.y > 10000)
_clip3.x = 1000 +3000*Math.random()-_clip10.x;
_clip3.y = 300;
_clip3.alpha = 1;
_clip3.scaleY = Math.abs(_clip3.scaleY);
ay1 = vy1 = 0;
phish1BeenHit = false;
if (_clip4.y > 10000)
_clip4.x = 1000 +3000*Math.random()-_clip10.x;
_clip4.y = 300;
_clip4.alpha = 1;
_clip4.scaleY = Math.abs(_clip4.scaleY);
ay2 = vy2 = 0;
phish2BeenHit = false;
if (_clip5.y > 10000)
_clip5.x = 1000 +3000*Math.random()-_clip10.x;
_clip5.y = 300;
_clip5.alpha = 1;
_clip5.scaleY = Math.abs(_clip5.scaleY);
ay3 = vy3 = 0;
phish3BeenHit = false;
if (_clip6.y > 10000)
_clip6.x = 1000 +3000*Math.random()-_clip10.x;
_clip6.y = 300;
_clip6.alpha = 1;
_clip6.scaleY = Math.abs(_clip6.scaleY);
ay4 = vy4 = 0;
phish4BeenHit = false;
var missleDisappear1 = new MissleDisappear(_clip11,_clip3,_clip4,_clip5,_clip6,_clip10);
var missleDisappear2 = new MissleDisappear(_clip12,_clip3,_clip4,_clip5,_clip6,_clip10);
var missleDisappear3 = new MissleDisappear(_clip13,_clip3,_clip4,_clip5,_clip6,_clip10);
var missleDisappear4 = new MissleDisappear(_clip14,_clip3,_clip4,_clip5,_clip6,_clip10);
var missleDisappear5 = new MissleDisappear(_clip15,_clip3,_clip4,_clip5,_clip6,_clip10);
var missleDisappear6 = new MissleDisappear(_clip16,_clip3,_clip4,_clip5,_clip6,_clip10);
var missleDisappear7 = new MissleDisappear(_clip17,_clip3,_clip4,_clip5,_clip6,_clip10);
var missleDisappear8 = new MissleDisappear(_clip18,_clip3,_clip4,_clip5,_clip6,_clip10);
var missleDisappear9 = new MissleDisappear(_clip19,_clip3,_clip4,_clip5,_clip6,_clip10);
var missleDisappear10 = new MissleDisappear(_clip20,_clip3,_clip4,_clip5,_clip6,_clip10);
var missleDisappear11 = new MissleDisappear(_clip21,_clip3,_clip4,_clip5,_clip6,_clip10);
var missleDisappear12 = new MissleDisappear(_clip22,_clip3,_clip4,_clip5,_clip6,_clip10);

I would approach it in much the same way as you would in java, by making getters and setters for all of your class variables.
Getters being for returning the values, Setters being for setting them.
So you would make a get function for the variable you want to access ala:
function get1PhishBeenHit():boolean {
return this.phish1BeenHit;
Then to access the value of that variable from outwith the class:
var result:boolean = ClassInstanceName.get1PhishBeenHit();

Moving Variable from one class to another.

I need to get a Variable from one class to another how would I do this?

Well this is a very tipical scehario for every enterprise application. You always create logger classes that generate log files for your application, as that is the only way to track errors in your system when its in the production enviorment.
Just create a simple class that acts as the Logger, and have a method in it that accepts a variable of the type that you are are trying to pass; most commonly a String; but can be overloaded to accept constom classes. e.g.
class Logger
public void log(String message)
writeToFile("< " + new Date() + " > " + message);
public void log(CustomClass queueEvent)
log("queue message was: " + queueEvent.getMessage() + " at: " + queueEven.getEventTime());
}Hope this makes things clearer
Regards
Omer

Calling a method from another class... that requires variables?

I'm calling a method from another class to change the date (its a date object) in another class.
I keep getting the error 'setDate(int,int,int) in Date cannot be applied to ()'
My code is:
public int changeDate()
cycleDate.setDate();
}I'm guessing I need to pass 3 parameters (day, month, year), but I'm not sure how! I have tried, but then I get errors such as ')' expected?
Any ideas! :D

f1d wrote:
I'm calling a method from another class to change the date (its a date object) in another class.
I keep getting the error 'setDate(int,int,int) in Date cannot be applied to ()'
My code is:
public int changeDate()
cycleDate.setDate();
}I'm guessing I need to pass 3 parameters (day, month, year), seems that way from the error you posted
but I'm not sure how!
setDate(16, 6, 2008);
I have tried, but then I get errors such as ')' expected?
Any ideas! :Dyou need to post your code if you're getting specific errors like that.
but typically ')' expected means just that, you have too many or not enough parenthesis (or in the wrong place, etc.)
i.e. syntax error

Using a variable from another method within another method

I have a couple methods. In the beginning of the class I declared the double variables. Then I have a method1 that in that class that changes those double variables. Then the last method2 runs, and is suppose to print information to the screen with the changed variable information all being called from another class. How do I get those changed double variables to be read in method2?

Sorry about all that, when I paste it in from the compiler it's skews it some, but hopefully this should be more readable
* Project Filename: Lab1s2
* Program Filename: Lab1s2.java
* I/O Files used:
* Fuction:          This program will use interactive input to ask cost of a
*                   product in dollars and cents (eg. 17.50). If the product
*                   is not less than $100.00, an error message will be displayed
*                   and input will be requested again. Once a valid value is
*                   given, the program will calculate the fewest bills and change
*                   to be returned if the customer gives a $100.00 bill.
* Formulas:         (100 - amount = change)
* Algorithm:
* Purpose:          The main method calls other methods found in the MoneyXX class
*                   that will accomplish the function of the project.
public class Lab2sl
     public static void main( String[] args ) // main method begins program execution
     Money2sl myMoney2sl = new Money2sl(); // create myMoney2sl object and assign it to Money2sl
        myMoney2sl.inputSL();// calls input method and pass argument
        myMoney2sl.changeSL(); // calls change method
        System.out.println(); // output a blank line
     myMoney2sl.outputSL(); //calls outputSL to show results
* Project Filename: Money2SL.java
import java.util.Scanner;
import java.util.Calendar;
public class Money2sl
     Scanner input = new Scanner( System.in ); // create Scanner to obtain input from command window
    private double change,
                   amount; // instant variable, stores amount
    private double twentyD = 20.00;
    private double tenD = 10.0;
    private double fiveD = 5.0;
     private double dollar = 1.0;
     private double quarter = 0.25;
     private double dime = 0.10;
     private double nickel = 0.05;
     private double penny = 0.01;
     private double numTwentyD;
     private double numTenD;
     private double numFiveD;
     private double numDollar;
     private double numQuarter;
     private double numDime;
     private double numNickel;
     private double numPenny;
    // inputSL() method gets amount, checks to see if it is under $100, stores amount into variable
    public void inputSL() //input method
         Calendar dateTime = Calendar.getInstance(); // get current date and time
        //print date and time
        System.out.printf( "%s\n", "nothing" );
        System.out.printf( "%1$ta, %1$tB. %1$te, %1$tY %1$tr\n\n", dateTime );
         //print output
            System.out.println( "Please enter the amount of money (less than $100) that you will spend: "); // prompt
          amount = input.nextDouble();
          while ( amount > 100 )
              System.out.println( "error - enter amount less than $100");
            System.out.println( "Please enter the amount of money (less than $100) that you will spend: "); // prompt
              amount = input.nextDouble();
         } // end inputSL method
    // changeSL() calculates change from amount entered out of $100
     public void changeSL()
          change = 100 - amount; // calculate change
          while(change > 0)
        if ( change - fiveD >= 0 )
                    numFiveD ++;
                   change -= fiveD;
          if ( change - fiveD >= 0 )
                    numFiveD ++;
                   change -= fiveD;
          if ( change - dollar >= 0 )
                    numDollar++;
                   change -= dollar;
          if ( change - quarter >= 0 )
                    numQuarter ++;
                   change -= quarter;
          if ( change - dime >= 0 )
                    numDime ++;
                   change -= dime;
          if ( change - nickel >= 0 )
                   numNickel ++;
                   change -= nickel;
          if ( change - penny >= 0 )
                    numPenny ++;
                   change -= penny;
     } // end changeSL method
    //outputSL() displays original amount, change dollar amount, and change in individual bills and coins
    public void outputSL()
         System.out.printf( "$%.2f dollars will return $%.2f, which is: ",
                             amount, change );
        System.out.println(); // blank line
         System.out.println(); // blank line
        if ( numTwentyD > 0 )
             if ( numTwentyD > 1)
                  System.out.println( numTwentyD + " twenty dollar bills" );
             System.out.println( numTwentyD + " twenty dollar bill" );
        if ( numTenD > 0)
             if ( numTenD > 1 )
                  System.out.println( numTwentyD + " ten dollar bills" );
             System.out.println( numTwentyD + " ten dollar bill" );
        if ( numFiveD > 0)
             if ( numFiveD > 1 )
                  System.out.println( numFiveD + " five dollar bills" );
             System.out.println( numFiveD + " five dollar bill" );
        if ( numDollar > 0)
             if ( numDollar > 1 )
                  System.out.println( numDollar + " one dollar bills" );
             System.out.println( numDollar + " one dollar bill" );
          if ( numQuarter > 0)
             if ( numQuarter > 1 )
                  System.out.println( numQuarter + " quarters" );
             System.out.println( numDollar + " quarter" );
          if ( numDime > 0)
             if ( numDime > 1 )
                  System.out.println( numDime + " dimes" );
             System.out.println( numDime + " dime" );
          if ( numNickel > 0)
             if ( numNickel > 1 )
                  System.out.println( numNickel + " nickels" );
             System.out.println( numNickel + " nickel" );
          if (numPenny > 0)
             if ( numPenny > 1 )
                  System.out.println( numPenny + " pennies" );
             System.out.println( numPenny + " penny" );
}

Accessing a JTextField from another class

I 've got 2 classes I am trying to get the value of a JTextField that located in a second class see the code
class1 myClass = new class1();
String text = myClass.jTextField1.getText();
System.out.print(text);What happens is when i run the program and enter some text in the jTextFild1 and then click on my Jbutton it does not print anything
the JButton is in the caller class
Could anyone explains to me what is wrong

an example would help maybe....
if you want to access your jtextfield from another class then:
import javax.swing.*;
public class FieldHolderClass {
public JTextField jtf = null;
public FieldHolder() {
JFrame jf = new JFrame();
jtf = new JTextField();
jtf.setText("this is the text that is here when other callerclass seeks for text");
jf.getContentPane().add(jtf);
jf.setVisible(true);
public class CallerClass {
public static void main(String args[]) {
FieldHolderClass fHolder = new FieldHolderClass();
System.out.println((fHolder.jtf.getText());
}of course i have not written any swing app for a long time, so i might have forgotten everything... so, don't flame me when that code does not compile.
the thing that it's supposed to show, is that you make a <b>public</b> variabel (jtf) and you simply ask for it from another class by typing holderclass instances name dot and that variable name (in this case jtf) and dot and then call the method on that variable (or object...)
it might also be that you want your code to work the way that when you enter a text into jtextfield, then after pressing enter it would get printed on terminal...
in that case you should also register some Listeners... i remember that back when i was just getin' to know java then i had problems with it as well... but then again, i didn't read any manuals...
i hope i was somewhat help...

Problem getting arraylist from another class

I am trying to call information about an arraylist from another class. I am using this code to call the size of an arraylist:
import java.io.*;
public class Test
    public static void main(String argv[]) throws IOException
Echo03 thing = new Echo03();
int y=thing.value();
System.out.println(y);
Echo03 thing2 = new Echo03();
int x=thing2.percent.size();
System.out.println(x);
}from another file which starts like this:
public class Echo03 extends DefaultHandler
static ArrayList<String> percent = new ArrayList<String>();
static ArrayList<String> text = new ArrayList<String>();
int a;
public int value(){
     return percent.size();
public static void main(String argv[]) throws IOException
    {The second file is based on an example piece of code from the Java website. I havent posted the whole thing, but if it is relevant then please ask.
Anyway when I run Echo03 by itself, the arraylist has a size of 2. But when I run it from the Test file, it says a size of 0. Is this because the data is not being transferred between the classes? Or is the Echo03 program not executing (and hence the arraylist is not filling up)?
How can I fix this? I have tried 2 ways of calling the data (As seen in my Test file). Neither work.

I didnt post the full bit of the code for the second one. Here it is:
import java.io.*;
import org.xml.sax.*;
import org.xml.sax.helpers.DefaultHandler;
import javax.xml.parsers.SAXParserFactory;
import javax.xml.parsers.ParserConfigurationException;
import javax.xml.parsers.SAXParser;
import java.util.ArrayList;
import java.awt.*;
import javax.swing.*;
public class Echo03 extends DefaultHandler
static ArrayList<String> percent = new ArrayList<String>();
static ArrayList<String> text = new ArrayList<String>();
int a;
public static void main(String argv[]) throws IOException
        if (argv.length != 1) {
            System.err.println("Usage: cmd filename");
            System.exit(1);
        // Use an instance of ourselves as the SAX event handler
        DefaultHandler handler = new Echo03();
        // Use the default (non-validating) parser
        SAXParserFactory factory = SAXParserFactory.newInstance();
        try {
            // Set up output stream
   out = new OutputStreamWriter(System.out, "UTF8");
            // Parse the input
            SAXParser saxParser = factory.newSAXParser();
            saxParser.parse( new File(argv[0]), handler);
for (int b=0; b<percent.size();b++){
     System.out.println(percent.get(b+1));
        } catch (Throwable t) {
        System.exit(0);
    static private Writer out;
    public void startElement(String namespaceURI,
                             String lName, // local name
                             String qName, // qualified name
                             Attributes attrs)
    throws SAXException
        if (attrs != null) {
StringBuffer sb = new StringBuffer (250);
for (int i = 0; i < attrs.getLength(); i++) {
                nl();
                emit(attrs.getValue(i));
          sb.append (attrs.getValue(i));
String sf = sb.toString ();
percent.add(sf);
System.out.println(" String: "+sf); a++;
    public void characters(char buf[], int offset, int len)
    throws SAXException
         emit(" ");
        String s = new String(buf, offset, len);
        if (!s.trim().equals("")) {text.add(s); emit(s);}
//===========================================================
    // Utility Methods ...
    //===========================================================
    // Wrap I/O exceptions in SAX exceptions, to
    // suit handler signature requirements
    private void emit(String s)
    throws SAXException
        try {
            out.write(s);
            out.flush();
        } catch (IOException e) {
            throw new SAXException("I/O error", e);
    // Start a new line
    private void nl()
    throws SAXException
        String lineEnd = System.getProperty("line.separator");
        try {
            out.write(lineEnd);
        } catch (IOException e) {
            throw new SAXException("I/O error", e);
}

Reading variable from another class

Similar Messages

Maybe you are looking for