I am completealy new at java. HELP!!!!
K, hi, well, i am experienced in HTML and Macromedia Flash, and Game Maker 5, a shit game maker prog. Ne ways, i admire games like RuneScape and would like to know how i would get around to making one. I know that i can't just jut out and make a rs type game. But i would like to know where to start? Are there programs i need to buy or DL, or are there books? And btw, is Java like HTML where u sit in front of a notepad prog, and type? or is it like u type and see whats happening? or do u add objects and give them properties..... Its a whole lot to ask! lol, Help me out.......try to answer it all.
Resources for Beginners
Sun's basic Java tutorial
Sun's New To Java Center. Includes an overview of what Java is, instructions for setting up Java, an intro to programming (that includes links to the above tutorial or to parts of it), quizzes, a list of resources, and info on certification and courses.
http://javaalmanac.com. A couple dozen code examples that supplement The Java Developers Almanac.
jGuru. A general Java resource site. Includes FAQs, forums, courses, more.
JavaRanch. To quote the tagline on their homepage: "a friendly place for Java greenhorns." FAQs, forums (moderated, I believe), sample code, all kinds of goodies for newbies. From what I've heard, they live up to the "friendly" claim.
Bruce Eckel's Thinking in Java (Available online.)
Joshua Bloch's Effective Java
Bert Bates and Kathy Sierra's Head First Java. This one has been getting a lot of very positive comments lately.
But i would like to know where to start? With reading the "New To Java" tutorials.
Are there programs i need to buy or DLTo start with you only need Notepad, and the JDK (AKA the Java SDK), downloadable from http://java.sun.com/j2ee/1.4/download-sdk.html
Later on, you might also want an IDE, or maybe just a better text editor. But for now, just stick with Notepad.
And btw, is Java like HTML where u sit in front of a notepad prog, and type?Mostly, after writing something (in Notepad), then compile it, then run it. And extra step than HTML has.
or is it like u type and see whats happening?You can also get interactive shells for it, but for now, do not worry about them.
r do u add objects and give them propertiesYou can get IDEs which let you work this way, but for now, do not worry about them.
Similar Messages
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Convert C++ prog into Java( I m new in java)help urgent
hi all,
i am very new in java. i have code of C++.i have to convert it in to Java.please help me on urgent basis.plz provide me solution.
I am looking for positive response.code is below:
#include <stdio.h>
#include <string.h>
#include <stdlib.h>
#include <sys/stat.h>
#include <fstream.h>
#include <iostream.h>
//#include <sha.h> //24112003
//#include<wincrypt.h>
char ntc(unsigned char n){
if (n<26) return 'A'+n;
if (n<52) return 'a'-26+n;
if (n<62) return '0'-52+n;
if (n==62) return '+';
if (n==63)return '/';
unsigned char ctn(char c){
if (c=='/') return 63;
if (c=='+') return 62;
if ((c>='A')&&(c<='Z')) return c-'A';
if ((c>='a')&&(c<='z')) return c-'a'+26;
if ((c>='0')&&(c<='9')) return c-'0'+52;
if (c=='~') return 80;
return 100;
int b64decode(char from,char to,int length){
unsigned char c,d,e,f;
char A,B,C;
int i;
int add;
char *tot=to;
for (i=0;i+3<length;){
add=0;
A=B=C=0;
c=d=e=f=100;
while ((c==100)&&(i<length)) c=ctn(from[i++]);
while ((d==100)&&(i<length)) d=ctn(from[i++]);
while ((e==100)&&(i<length)) e=ctn(from[i++]);
while ((f==100)&&(i<length)) f=ctn(from[i++]);
//if (f==100) return -1; /* Not valid end */
if (c<64) {
A+=c*4;
if (d<64) {
A+=d/16;
B+=d*16;
if (e<64) {
B+=e/4;
C+=e*64;
if (f<64) {
C+=f;
to[2]=C;
add+=1;
to[1]=B;
add+=1;
to[0]=A;
add+=1;
to+=add;
if (f==80) return to-tot; /* end because '=' encountered */
return to-tot;
int b64get_encode_buffer_size(int l,int q){
int ret;
ret = (l/3)*4;
if (l%3!=0) ret +=4;
if (q!=0){
ret += (ret/(q*4));
/* if (ret%(q/4)!=0) ret ++; */ /* Add space for trailing \n */
return ret;
int b64strip_encoded_buffer(char *buf,int length){
int i;
int ret=0;
for (i=0;i<length;i++) if (ctn(buf)!=100) buf[ret++] = buf [i];
return ret;
int b64encode(char from,char to,int length,int quads){
// 3 8bit numbers become four characters
int i =0;
char *tot=to;
int qc=0; // Quadcount
unsigned char c;
unsigned char d;
while(i<length){
c=from[i];
*to++=ntc(c/4);
c=c*64;
i++;
if (i>=length) {
*to++=ntc(c/4);
*to++='~';
*to++='~';
break;
d=from[i];
*to++=ntc(c/4+d/16);
d=d*16;
i++;
if (i>=length) {
*to++=ntc(d/4);
*to++='~';
break;
c=from[i];
*to++=ntc(d/4+c/64);
c=c*4;
i++;
*to++=ntc(c/4);
qc++; /* qz will never be zero, quads = 0 means no linebreaks */
if (qc==quads){
*to++='\n';
qc=0;
/* if ((quads!=0)&&(qc!=0)) to++='\n'; / /* Insert last linebreak */
return to-tot;
char* mEncryptPassword(char* mPassword)
char mEncryptedPassword[200]; // To hold encrypted password.
//char* mEncryptedPassword = new char[200];
char mPrimEncryptedPassword[200];
char * temp = new char[200];
//unsigned char* md; // 19122003
//md = new unsigned char[100]; // 19122003
memset(mEncryptedPassword, '\0', sizeof(mEncryptedPassword));
memset(mPrimEncryptedPassword, '\0', sizeof(mPrimEncryptedPassword));
strcpy(mPrimEncryptedPassword, mPassword);
//strcpy(mPrimEncryptedPassword, (char*) SHA1((unsigned char*) mPassword, strlen(mPassword), NULL));
//strcpy(mEncryptedPassword, (char*) SHA((unsigned char*) mPassword, strlen(mPassword), md)); // 19122003
//strcpy(mEncryptedPassword, (char*) SHA((unsigned char*) mPassword, strlen(mPassword), md)); //19122003
b64encode(mPrimEncryptedPassword, mEncryptedPassword, strlen(mPrimEncryptedPassword), 0);
// If successfully encrypts..
if (mEncryptedPassword != NULL)
//char * temp = new char[strlen(mEncryptedPassword)+1];
strcpy(temp,mEncryptedPassword);
// strcpy(mRetVal,mEncryptedPassword);
return (char*)temp;
//return (mEncryptedPassword);
//return (char*) md; // 19122003
else
return ("Error");
char* mDecryptPassword(char* mPassword)
char mDecryptedPassword[200]; // To hold decrypted password.
char mPrimDecryptedPassword[200];
char * temp = new char[200];
// 02032007
memset(mDecryptedPassword, '\0', sizeof(mDecryptedPassword));
memset(mPrimDecryptedPassword, '\0', 200);
strcpy(mPrimDecryptedPassword, mPassword);
b64decode(mPrimDecryptedPassword, mDecryptedPassword, strlen(mPrimDecryptedPassword));
// If successfully decrypts..
if (mDecryptedPassword != NULL)
//char * temp = new char[strlen(mEncryptedPassword)+1];
strcpy(temp,mDecryptedPassword);
// strcpy(mRetVal,mDecryptedPassword);
return (char*)temp;
//return (mEncryptedPassword);
//return (char*) md; // 19122003
else
return ("Error");
void main(int argc, char* argv[])
cout << mEncryptPassword(argv[1])<<endl<<flush;
cout << mDecryptPassword(mEncryptPassword(argv[1]))<<endl<<flush;
Anubhavendasil wrote:
I just thought of how ridiculous this would sound in any other profession:
Surgeons:
plz plz help I have patient dying need to insert new kidney into 90yr old patient plz someone come do itLawyers:
Help client guilty need good defense (I m new in law)help urgentHow come we get stuck with the lazy low-lifes?Because there's no legal requirement that a software developer must be licensed -
New to java,,,help needed urgently
I am geeting a compile error..."cannot resolve symbol" in my main class. The program is supposed to prompt the user for five sets of data, and calculate the tax and total of the entered products and print it back to the screen, it is also supposed to calculate the cheapest and most expensive item and print them back. can someone pls shed some light on this error msg, as I cant seem to get my head around it.
import java .io.*;
import java.util.StringTokenizer;
import java.text.NumberFormat;
import java.util.Locale;
//set up a class to call on the constructors from the catalogueitem class
public class Myassg4
private static final int MAX = 2;//sets the length to 2
private static CatalogueItem[] prodlist ;//sets array for product list
NumberFormat cash = NumberFormat.getCurrencyInstance(new Locale("en","AU"));
private static void main(String[] args) throws IOException
{//declare the variables and initialize
double preTotal = 0.00;
String inString;
double maximum, lowest;
double sum = 0.00;
BufferedReader stdin = new BufferedReader (new
InputStreamReader(System.in));
prodlist = new CatalogueItem[];//sets the length (THIS IS WHERE THE PROBLEM OCCURS!!!!)
System.out.println("Enter 5 sets of data");
//loop through the array and read the data in
for(int i = 0;i <prodlist.length;i++)
inString = stdin.readLine();
//create a String Tokenizer to read the data separately
StringTokenizer tok = new StringTokenizer(inString, ":");
prodlist[i] = new CatalogueItem(tok.nextToken(), tok.nextToken(),
Double.parseDouble(tok.nextToken()));
}//end of loop
//create a header and print the data back to the screen
System.out.println();
System.out.println("LISTING OF ALL GOODS");
System.out.println();
System.out.println("Cat\tDescription\tExTax\tTax\tIncTax");
System.out.println("___\t___________\t_____\t___\t______");
System.out.println();
for(int j = 0;j <prodlist.length;j++){
System.out.println(prodlist[j].getCatno()+"\t"+prodlist[j].getDesc()+
"\t"+prodlist[j].getPrice()+"\t"+prodlist[j].getTax()
+"\t"+prodlist[j].getIncTax());
I have errors every where the prodlist is used, I know I am not initializing it correctly but dont know what the alternatives are.daniel here is the entire code if you do get a chance can you pls have a look at it for me thanks.
import java .io.*;
import java.util.StringTokenizer;
import java.text.NumberFormat;
import java.util.Locale;
//set up a class to call on the constructors from the catalogueitem class
public class Myassg4
private static final int MAX = 2; //sets the length to 2
private static CatalogueItem[] prodlist; //sets array for product list
NumberFormat cash = NumberFormat.getCurrencyInstance(new Locale("en","AU"));
private static void main(String[] args) throws IOException
{//declare the variables and initialize
double preTotal = 0.00;
String inString;
double maximum, lowest;
double sum = 0.00;
BufferedReader stdin = new BufferedReader (new
InputStreamReader(System.in));
prodlist = new CatalogueItem[5];//sets the length
System.out.println("Enter 5 sets of data");
//loop through the array and read the data in
for(int i = 0;i <prodlist.length;i++)
inString = stdin.readLine();
//create a String Tokenizer to read the data separately
StringTokenizer tok = new StringTokenizer(inString, ":");
prodlist[i] = new CatalogueItem(tok.nextToken(), tok.nextToken(),
Double.parseDouble(tok.nextToken()));
}//end of loop
//create a header and print the data back to the screen
System.out.println();
System.out.println("LISTING OF ALL GOODS");
System.out.println();
System.out.println("Cat\tDescription\tExTax\tTax\tIncTax");
System.out.println("___\t___________\t_____\t___\t______");
System.out.println();
for(int j = 0;j <prodlist.length;j++){
System.out.println(prodlist[j].getCatno()+"\t"+prodlist[j].getDesc()+
"\t"+prodlist[j].getPrice()+"\t"+prodlist[j].getTax()
+"\t"+prodlist[j].getIncTax());
//use this data and call the cheapest method to print
//the cheapest goods in the catalogue
System.out.println();
System.out.println("CHEAPEST GOODS IN THE CATALOGUE");
System.out.println();
lowest = cheapest(prodlist, MAX);
System.out.println("Cat\tDescription\tExTax\tTax\tIncTax");
System.out.println("___\t___________\t_____\t___\t______");
System.out.println();
for(int k = 0;k <prodlist.length;k++){
if(prodlist[k].getTaxInc == lowest)
System.out.println(prodlist[k].Catno()+"\t"+prodlist[k].getDesc()+
"\t"+prodlist[k].getPrice()+"\t"+prodlist[k].getTax()
+"\t"+prodlist[k].getIncTax());
//use the listing of all goods and call the most expensive method
//to calculate and display back on screen
System.out.println();//create two lines of space in between
System.out.println();
System.out.println("MOST EXPENSIVE GOODS IN THE CATALOGUE");
System.out.println();
maximun = expensive(prodlist, MAX);
System.out.println("Cat\tDescription\tExTax\tTax\tIncTax");
System.out.println("___\t___________\t_____\t___\t______");
System.out.println();
for(int l = 0;l < prodlist.length;l++){
if(prodlist[l].getTaxInc == maximum)
System.out.println(prodlist[l].Catno()+"\t"+prodlist[l].getDesc()+
"\t"+prodlist[l].getPrice()+"\t"+prodlist[l].getTax()
+"\t"+prodlist[l].getIncTax());
//print the pretax worth of goods by calling the method and display
System.out.println();//create a two lines of space in between
System.out.println();
System.out.println("TOTAL OF PRE-TAX WORTH OF CATALOGUE ITEMS: "+preTaxWorth
(prodlist));
//print the avg tax payable per item
System.out.println();
System.out.println("AVERAGE AMOUNT OF TAX PAYABLE PER ITEM:"+avgTax
(prodlist));
//declare the other methods within the scope of the main class
public static double cheapest(CatalogueItem[] prodlist, int size)
double lowest = prodlist[0].getIncTac();
for(int i = 0; i < size;i++)
if(prodlist.getIncTax() < lowest)
lowest = prodlist[i].getIncTax();
return lowest;
public static double expensive(CatalogueItem[] prodlist, int size)
double maximum = prodlist[0].getTaxInc();
for(int i = 0; i < size; i++)
if(prodlist[i].getIncTax() > maximum)
maximum = prodlist[i].getIncTax();
return maximum;
public static double preTaxWorth(CatalogueItem[] prodlist)
{//add all the getPrice's in together
double preTax = 0; //prodlist[0].getPrice();
for(int i =0; i <prodlist.length; i++)
preTax += prodlist[i].getPrice();
return preTax;
public static double avgTax(CatalogueItem[] prodlist)
{//run through the array and add all the getTax amounts up.
double sum = 0;
for(int i = 0; i < prodlist.length; i++)
sum = sum + prodlist[i].getTax();
//to get the avg we divide the sum by the MAX number of entries
double Total = sum / MAX;
return Total;
}//end of main class
//CatalogueItem class
//catalogue item class
//ensure that the accesors and mutators
//are visible and cannot be overridden
class CatalogueItem
//declare the data types
private String catno;
private String desc;
private double price;
//declare the taxation rate constant
//but make it visible
public CatalogueItem(){
catno = " ";
desc = " ";
double price;
//declare the full constructor
CatalogueItem (String inCatno, String inDesc, double Price)
inCatno = catno;
inDesc = desc;
Price = price;
//name accessor---not overidable
public final String getCatno()
return catno;
//name product description accessor--not overidable
public final String getDesc()
return desc;
//name the extax method
public double getPrice()
return price;
//tax utility method
public double Tax()
double Tax;
Tax = 00.15 * getPrice();
return Tax;
//Including Tax method
public double IncTax()
double IncTax;
IncTax = Tax() + getPrice();
return IncTax; -
Writting Tools for Java (Very new to java HELP!!!!)
It's hard to write a java applet using a windows notepad, because I must to save as a *.java files, open a msdos prompt type (javac *.java), and run it (very inefficinet :( ).
Doesn't like Vb, notepad didn't alert me if I make a mistake like this :.
--System.out.println("good")
--Sistem.out.println(":( wrong)
HELP ME PLEASEEEEE!!!!Forte, where can I download it from?Link to Forte (now called Sun One Studio 4):
http://wwws.sun.com/software/sundev/jde/index.html
Link to JCreator (a text editor):
http://www.jcreator.com/
Link to search results on Google.com:
http://www.google.com/search?hl=en&ie=UTF-8&oe=UTF-8&q=java+ide%2Ceditor -
Hi,
I am writing a utility to monitor all the objects created by my application. I want to be able to get not only values of class variables(for which the reflection package seems pretty useful), but also instance variables.
For example.
public class myClass {
//Constructor
public myClass(int i) {
// another class instantiates this one
myClass mc = new myClass(10);
myClass mc1 = new myClass(20);
I need to keep track of the the handles mc and mc1 and the
other initializations they do based on the value passed at runtime.
Is there a way to to this. Or even better, is there someplace in Java which stores all the objects instantiated and their handles?
Any suggestions would be greatly appreciated.
Thnx
cvsanHow do I access private and proteced variables. By default only the public variables are accessible via the reflect class as in the example below.
Class c = rc.getClass();
String s = c.getName();
System.out.println(s);
try { abcField = c.getField("abc");
where abc is a public instance variable. If abc is a private instance variable, the above example fails.
Is there any way to override the data hiding feature of Java?
Thanks
cvsan -
Hello-
I have to allow the user to enter 2 numbers until they enter the provided break. Then using recursion I have to perform the operation a times b and a to the power of b. The trick is I have to use addition. Then print out the results for each pair of numbers.
Thank you!http://forum.java.sun.com/thread.jspa?threadID=713853&tstart=10
One thread per question please. -
Gettin variable amount have not been initialised error new to java help plz
hey guys im doin this as an hw assignment for class keep gettin error Variable amount has not been initialised can some please tell me wut my error is n wut is wrong with my code please thankyou:
/*Objective
import javax.swing.JOptionPane;
public class Scholarships {
static final double MAX1 = 1000;
static final double MAX2 = 200;
static final double MAX3 = 5000;
static final double MAX4 = 1000;
public static void main(String [] args)
String major;
double gpa, sat, amount;
major = JOptionPane.showInputDialog(null, "What is your major?");
gpa = Double.parseDouble(JOptionPane.showInputDialog("What is your final high school GPA?"));
sat = Double.parseDouble(JOptionPane.showInputDialog("What is your combined (verbal and math only) SAT score?"));
//comment
if (gpa >= 3.2 & sat >= 1100)
JOptionPane.showMessageDialog(null, "Congratulations, you have been accepted into the program.");
else
JOptionPane.showMessageDialog(null, "Sorry, you are not accepted into the program.");
//comment
if (gpa < 3.5)
JOptionPane.showMessageDialog(null, "Sorry, but you are not eligible for a scholarship.");
else if (gpa >= 3.5 && gpa <= 3.6) amount = MAX1;
else if (gpa > 3.6) amount = MAX3;
if (gpa >= 3.5 && gpa <= 3.6 && sat > 1200) amount = MAX1 + MAX2;
if (gpa > 3.6 && sat >= 1400) amount = MAX3 + MAX4;
JOptionPane.showMessageDialog(null, "You have been accepted into the program and have been awarded $ "+amount+" as a scholarship.");
Edited by: raikien on Sep 22, 2010 7:28 PM
Edited by: raikien on Sep 22, 2010 7:47 PMsorry here is the code with the code button i think i figured out the error but here is the original code that i used taht gave me the problem:
/*Objective
import javax.swing.JOptionPane;
public class Scholarships {
static final double MAX1 = 1000;
static final double MAX2 = 200;
static final double MAX3 = 5000;
static final double MAX4 = 1000;
public static void main(String [] args)
String major;
double gpa, sat, amount;
major = JOptionPane.showInputDialog(null, "What is your major?");
gpa = Double.parseDouble(JOptionPane.showInputDialog("What is your final high school GPA?"));
sat = Double.parseDouble(JOptionPane.showInputDialog("What is your combined (verbal and math only) SAT score?"));
//comment
if (gpa >= 3.2 & sat >= 1100)
JOptionPane.showMessageDialog(null, "Congratulations, you have been accepted into the program.");
else
JOptionPane.showMessageDialog(null, "Sorry, you are not accepted into the program.");
//comment
if (gpa < 3.5)
JOptionPane.showMessageDialog(null, "Sorry, but you are not eligible for a scholarship.");
else if (gpa >= 3.5 && gpa <= 3.6) amount = MAX1;
else if (gpa > 3.6) amount = MAX3;
if (gpa >= 3.5 && gpa <= 3.6 && sat > 1200) amount = MAX1 + MAX2;
if (gpa > 3.6 && sat >= 1400) amount = MAX3 + MAX4;
JOptionPane.showMessageDialog(null, "You have been accepted into the program and have been awarded $ "+amount+" as a scholarship.");
} -
How can I open help file (HTML or .chm) from Java Web Start (new to JAVA)
Hi All,
Im trying to open the help file of my application.
When trying to access the help file from the GUI (pressing F1 for launching the help file), I'm geting the an error, something like:
"Can't show help URL: jar:file:C:\Documents and Settings\%USER%\Application Data\Sun\Java\Deployment\javaws\cache\http\Dlocalhost\P7001\DMwebstart\RMjar-name!/com/resources/helpFiles/MyHelpFile.html"
It seems that the file which is packed in a jar, was downloaded to the Java Web Start cache directory:
C:\Documents and Settings\%USER%\Application Data\Sun\Java\Deployment\javaws\cache\http\Dlocalhost\P7001\DMwebstart
The code which is activated when launching the help file is:
try
ResourceBundle resourceBundle = DoubleResourceBundle.getBundle("Resource", "ResourceImpl");
RuntimeUtil.launchFile(new File(resourceBundle.getString("help.file")));
} catch (IOException e)
// TODO Auto-generated catch block
e.printStackTrace();
}where the property "help.file" is in some property file in the resource bundle named "Resource", and looks like this :
help.file="com/trax/docs/help/global/MyHelpFile.html"
The function "RuntimeUtil.launchFile" knows how to launch any file in its default application, and indeed it does launches the html, when giving it an absolute path to the file on my PC, as "C:\Helpfiles\MyHelpFile.html" as such:
RuntimeUtil.launchFile("C:\Helpfiles\MyHelpFile.html");My question is :
The application is going to be deployed on a Customer PC. How can I access the html file from the code, with a relative path and not its absolute path on the customer pc, which I can't know?
I found these restrictions regarding web start:
(copied from "http://rachel.sourceforge.net/"):
*Rule 1: Java Archives only. No loose files.* All your resources have to be packaged in Java Archives (jar) if you want to have
them delivered to the user's machine and kept up-to-date automatically by Java Web Start.
*Rule 2: No file paths.* You can't use absolute or relative file paths to locate your
jars holding your resources (e.g. <code>jar:file:///c:/java/jws/.cache/resources.jar</code>).
Absolute file paths won't work because you never know where Java Web Start
will put your jar on the user's machine. Relative file paths won't work because Java Web Start
mangles the names of your jars (e.g. <code>venus.jar</code> becomes <code>RMvenus.jar</code>)
and every JNLP client implementation has the right to mangle your names
in a different way and you, therefore, can't predict the name with
which your jar will be rechristend and end up on the user's machine in
the application cache.Seems complex or impossible, to perform a simple task like opening a file.
Please advise (I'm new to Java and Web Start).
BTW, I'm working with IntelliJ IDEA 5.0.
Thanks,
Zedik.
{font:Tahoma}{size:26pt}
{size}{font}the follwing method i have used to open html file ...
so to access html file i am shipping resources folder with jar file ..
private void openHtmlPages(String pageName) {
String cmd[] = new String[2];
String browser = null;
File file = null;
if(System.getProperty("os.name").indexOf("Linux")>-1) {
file = new File("/usr/bin/mozilla");
if(!file.exists() ) {
}else {
browser = "mozilla";
}else {
browser = "<path of iexplore>";
cmd[0] = browser;
File files = new File("");
String metaData = "/resources/Help/Files/"+pageName+".html"; // folder inside jar file
java.net.URL url = this.getClass().getResource(metaData);
String fileName = url.getFile();
fileName = fileName.replaceAll("file:/","");
fileName = fileName.replaceAll("%2520"," ");
fileName = fileName.replaceAll("%20"," ");
fileName = fileName.replaceAll("jarfilename.jar!"," ").trim();
cmd[1] = fileName;
try{
Process p = Runtime.getRuntime().exec(cmd);
}catch(java.io.IOException io){
//Ignore
can anyone give me the solution..???
Regards
Ganesan S -
New to Java and need help with this program..please!
I'd really appreciate any helpful comments about this program assignment that I have to turn in a week from Friday. I'm taking a class one night a week and completely new to Java. I'd ask my professor for help, but we can't call him during the week and he never answers e-mails. He didn't tell us how to call from other classes yet, and I just can't get the darn thing to do what I want it to do!
The assignment requirements are:
1. Change a card game application that draws two cards
and the higher card wins, to a Blackjack application
2. Include a new class called Hand
3. The Hand class should record the number of draws
4. The application should prompt for a number of draws
5. The game is played against the Dealer
6. The dealer always draws a card if the dealer's hand total is <= 17
7. Prompt the player after each hand if he wants to quit
8. Display the total games won by the dealer and total and the total games wond by the player after each hand
9. Display all of the dealer's and player's cards at the
end of each hand
10. Player has the option of drawing an additional card after the first two cards
11. The Ace can have a value of 11 or 1
(Even though it's not called for in the requirements, I would like to be able to let the Ace have a value of 1 or an 11)
The following is my code with some comments about a few things that are driving me nuts:
import java.util.*;
import javax.swing.*;
import java.text.*;
public class CardDeck
public CardDeck()
deck = new Card[52];
fill();
shuffle();
public void fill()
int i;
int j;
for (i = 1; i <= 13; i++)
for (j = 1; j <= 4; j++)
deck[4 * (i - 1) + j - 1] = new Card(i, j);
cards = 52;
public void shuffle()
int next;
for (next = 0; next < cards - 1; next++)
int rand = (int)(Math.random()*(next+1));
Card temp = deck[next];
deck[next] = deck[rand];
deck[rand] = temp;
public final Card draw()
if (cards == 0)
return null;
cards--;
return deck[cards];
public int changeValue()
int val = 0;
boolean ace = false;
int cds;
for (int i = 0; i < cards; i++)
if (cardValue > 10)
cardValue = 10;
if (cardValue ==1) {
ace = true;
val = val + cardValue;
if ( ace = true && val + 10 <= 21 )
val = val + 10;
return val;
public static void main(String[] args)
CardDeck d = new CardDeck();
int x = 3;
int i;
int wins = 1;
int playerTotal = 1;
do {
Card dealer = (d.draw());
/**I've tried everything I can think of to call the ChangeValue() method after I draw the card, but nothing is working for me.**/
System.out.println("Dealer draws: " + dealer);
do {
dealer = (d.draw());
System.out.println(" " + dealer);
}while (dealer.rank() <= 17);
Card mine = d.draw();
System.out.println("\t\t\t\t Player draws: "
+ mine);
mine = d.draw();
System.out.println("\t\t\t\t\t\t" + mine);
do{
String input = JOptionPane.showInputDialog
("Would you like a card? ");
if(input.equalsIgnoreCase("yes"))
mine = d.draw();
System.out.println("\t\t\t\t\t\t" + mine);
playerTotal++;
else if(input.equalsIgnoreCase("no"))
System.out.println("\t\t\t\t Player stands");
else
System.out.println("\t\tInvalid input.
Please try again.");
I don't know how to go about making and calling a method or class that will combine the total cards delt to the player and the total cards delt to the dealer. The rank() method only seems to give me the last cards drawn to compare with when I try to do the tests.**/
if ((dealer.rank() > mine.rank())
&& (dealer.rank() <= 21)
|| (mine.rank() > 21)
&& (dealer.rank() < 22)
|| ((dealer.rank() == 21)
&& (mine.rank() == 21))
|| ((mine.rank() > 21)
&& (dealer.rank() <= 21)))
System.out.println("Dealer wins");
wins++;
else
System.out.println("I win!");
break;
} while (playerTotal <= 1);
String stop = JOptionPane.showInputDialog
("Would you like to play again? ");
if (stop.equalsIgnoreCase("no"))
break;
if (rounds == 5)
System.out.println("Player wins " +
(CardDeck.rounds - wins) + "rounds");
} while (rounds <= 5);
private Card[] deck;
private int cards;
public static int rounds = 1;
public int cardValue;
/**When I try to compile this nested class, I get an error message saying I need a brace here and at the end of the program. I don't know if any of this code would work because I've tried adding braces and still can't compile it.**/
class Hand()
static int r = 1;
public Hand() { CardDeck.rounds = r; }
public int getRounds() { return r++; }
final class Card
public static final int ACE = 1;
public static final int JACK = 11;
public static final int QUEEN = 12;
public static final int KING = 13;
public static final int CLUBS = 1;
public static final int DIAMONDS = 2;
public static final int HEARTS = 3;
public static final int SPADES = 4;
public Card(int v, int s)
value = v;
suit = s;
public int getValue() { return value; }
public int getSuit() { return suit; }
public int rank()
if (value == 1)
return 4 * 13 + suit;
else
return 4 * (value - 1) + suit;
/**This works, but I'm confused. How is this method called? Does it call itself?**/
public String toString()
String v;
String s;
if (value == ACE)
v = "Ace";
else if (value == JACK)
v = "Jack";
else if (value == QUEEN)
v = "Queen";
else if (value == KING)
v = "King";
else
v = String.valueOf(value);
if (suit == DIAMONDS)
s = "Diamonds";
else if (suit == HEARTS)
s = "Hearts";
else if (suit == SPADES)
s = "Spades";
else
s = "Clubs";
return v + " of " + s;
private int value; //Value is an integer, so how can a
private int suit; //string be assigned to an integer?
}Thank you so much for offering to help me with this Jamie! When I tried to call change value using:
Card dealer = (d.changeValue());
I get an error message saying:
Incompatible types found: int
required: Card
I had my weekly class last night and the professor cleared up a few things for me, but I've not had time to make all of the necessary changes. I did find out how toString worked, so that's one question out of the way, and he gave us a lot of information for adding another class to generate random numbers.
Again, thank you so much. I really want to learn this but I'm feeling so stupid right now. Any help you can give me about the above error message would be appreciated. -
Hey im brand new to java and i just downloaded and installed jdk-1_5_0_01-windows-i586-p now im tryin to set up the PATH permanently but i have no clue how to i went to the install notes and typed in C:\Program Files\Java\jdk1.5.0_<windows>\bin in the command.com but everytime i do it says access is denied. i have no clue how to set up the path permanently beside what i tried plz help!!!
You didn't which OS you are running, but it's fairly similar for all windows.
Start->settings->control panel->system->advanced->environment variables
Go to System variables, click on path, click edit button and add a semicolon and the path at the end. DO NOT REPLACE EVERYTHING THAT'S THERE NOW.
I don't have 1.5 installed on this computer, but I'm willing to bet the real path doesn't have '<windows>' in it. Use Windows Explorer to find out where java.exe actually exists on the hard disk and use that path -
Im new to java and hope somebody can help me with my question
Hi!
Im quite new to java and I just have some simple questions..
can someone please tell what kinds of error are considered as language violation for java? where can I find more info about these errors?
can someone give me a simple example on a kind of error that cannot be caught in both compilation and runtime? I hope someone can help me out. Thanks in advance!!knightz211 wrote:
Im just asking about errors that might go against the language definition but cant be detected.. If it "goes against the language defintion," it will be detected by the compiler. That's half of the compiler's job is to tell you what you've done that violates the language spec.
because it confuses me when they say that such errors might occur so I just want to know what might these errors be.. sorry for that..Who's "they"? What exactly* did "they" say about "such errors"? It sounds to me like you're just confused, and you think there's something mysterious and inexplicable going on but you don't know what and don't even know what you're asking.
I would suggest not worrying about hypothetical problems that you can't even put into words and focussing on learning Java. Along the way, if you encounter real, specific, actual problems, ask about them, and you'll probably get answers about the problems themselves and the language or theory behind them. -
Hi, i'm new to java. need help setting the path in win XP
hi all,
i'm new to java technology. i've just downloaded the JDK and ran my first java program (hello world). i love it. java's gr8. i need help. i run win XP and how can i setup the path sothat i can execute my programs from the root dir??? any help in this direction will be greatly appreciated. please email me @ [email protected]
Best regards
MrinalGo to Start menu and select Control Panel. In the Control Panel, double click on System. In the System dialogue, choose the Advanced tab. Then click on Environmental Variables. Select Path and Edit. Put ;c:\j2sdk1.4.0\bin at the end of the Path (or c:\j2sdk1.4.0\bin;) at the start of the Path. That's it.
-
I've created simple data base in sql and a simple html page,here is the code:
<%@ page import="java.util.*" import="java.sql.*" %>
<%!
private String emp_code, emp_name, emp_dept, emp_title, emp_doj, emp_dob;
private String error, info, create;
private short age;
private Statement stmt;
%>
<%
//load the JDBC driver
Class.forName("sun.jdbc.odbc.JdbcOdbcDriver");
Connection conn = DriverManager.getConnection("jdbc:odbc:Master","","");
Statement s = conn.createStatement();
s.executeUpdate("insert into employee_info values('" + emp_code + "', '" + emp_name + "','" + emp_dept + "','" + emp_title + "', '" + emp_doj + "','" + emp_dob + "') ");
System.out.println ("It has been successfully added");
%>
<HTML>
<HEAD>
<TITLE> ---: New Employee Information :--- </TITLE>
</HEAD>
<BODY>
<DIV ALIGN="center">
<H2> New Employee Information </H2></DIV>
<DIV ALIGN="center">
<p> � </p></DIV>
<FORM METHOD = "POST" ACTION = "NewEmp.jsp">
<H4>Employee Code: <INPUT TYPE= "text" NAME = "first1" SIZE = "17">����
Name: <INPUT TYPE = "TEXT" NAME = "first" SIZE = "51">�������
<font size="3">Title:�<SELECT name="Grade">
<OPTION SELECTED> - Select -
<OPTION >Programmer
<OPTION >Technetion
<OPTION>System Analyst
<OPTION>Network Administrator
</SELECT>�</font>
</H4>
<H4><font size="3">�</font>
</H4>
<H4><font size="3">Department Code:�</font><select name="Dept">
<OPTION SELECTED> - Select -
<OPTION >IT
<OPTION >Admin
<OPTION>MGM
<OPTION>CSD
<OPTION>SM
<OPTION>FIN
</SELECT>
��������
<font size="3"><b>DOB: </b> </font> <INPUT TYPE = "TEXT" NAME = "first2" SIZE = "18">������
<b><font size="3">DOJ: </font></b><INPUT TYPE = "TEXT" NAME = "first3" SIZE = "18">
</H4>
<p>�
</p>
<P align="center">
<INPUT TYPE = "SUBMIT" VALUE = "Submit">
<INPUT TYPE = "RESET">
<input type="button" value="Cancel" name="Cancel" onClick='javascript:window.close();'> </FORM>
<p align="center">�</p>
</BODY>
</HTML>
But I couldn't complete it or make the connection to the database, I want to fill in the blanks and then add it to the data base.
My database name is doctrak and the table name is employee_info and below the design of the table :
emp_code char 10
emp_name char 30
emp_dept char 15
emp_title char 10
emp_doj datetime 8
emp_dob datetime 8
I've installed the apatchi tomcat 401 and make the java environment.
So plz can any one help me in that?
ThanksBut I don't know how to handel the code, I didn't
study JSP or Java. I'm trying to learn it by doing
this, so please can you write the code for me in jsp
and how to put it in html then , how to do the
connection to my database?Iam sorry to disappoint you, but no.
If you are new to java and jsp taking up such a task to learn it is not ideal, nor
viable. I would suggest you learn the basics of the language first, then the basics
of jsp, then some jdbc and finally graduate to the example in question. There are
excellent tutorials avbl for all on the net.
Maybe someone else would even post the code here, but suggest you dont
waste time waiting on it.
All the best.
Cheers,
ram. -
i'm very new to java and i'm getting an error in my application. i took 4 applications that compiled and worked separatly and i tried to combine them into one application. i'm getting the error: unreported exception java.io.IOException; must be caught or declared to be thrown, in lines 73,78,83,88,120,146,149,152,155 in the and it points at the keyboard.readLine() but everything i've tried just gives me more errors. please help anything and everything will be greatly appreciated. here it is, sorry about format i dunno how to straighten it in here:
// ^ ^
// (0)(0) A Happy Piggy Application
// Problems: 2.6,2.8,2.9,2.12 (oo)
// An application finds the total number of hours, minutes, & seconds, finds the distance
// between two points, finds the volume and surface area of a sphere, and adds up the change
// in a jar. First, the total hours, minutes, and seconds problem.
import java.io.*;
import java.text.DecimalFormat;
import java.text.NumberFormat;
public class twoptsix
static BufferedReader keyboard = new BufferedReader(new InputStreamReader(System.in));
static PrintWriter screen = new PrintWriter(System.out, true);
public static void main (String[] args) throws IOException
double hoursa, minutesa, secondsa;
String hours;
System.out.print ("Please enter a number of hours: ");
hours = keyboard.readLine();
hoursa = Double.parseDouble(hours); //asks programmer friendly user to enter hours
String minutes;
System.out.print ("Please enter a number of minutes: ");
minutes=keyboard.readLine();
minutesa = Double.parseDouble(minutes); //asks programmer friendly user to enter minutes
String seconds;
System.out.print ("Pretty please enter a number of seconds: ");
seconds = keyboard.readLine();
secondsa = Double.parseDouble(seconds); //asks programmer friendly user to enter seconds
double allseconds;
allseconds = (hoursa * 3600) + (minutesa * 60) + secondsa; //adds up all the seconds of the time entered
System.out.println ("You have: " + hours + " hours..."); //displays hours
System.out.println ("" + minutes + " minutes..."); //displays minutes
System.out.println ("and " + seconds + " seconds..."); //displays seconds
System.out.println ("to get whatever you need to done!"); //witty attempt at humor
System.out.println ("The total amount of seconds is: " + allseconds + " seconds."); //displays total seconds
// An application that finds the distance between two points when the points
// are given by the user.
double x1, x2, y1, y2, total, distance;
String xa;
System.out.print ("Please enter the 'x' coordinate of first point: ");
xa = keyboard.readLine();
x1 = Double.parseDouble(xa); //asks programmer friendly user to enter first x value
String ya;
System.out.print ("...also need the 'y' coordinate of first point: ");
ya = keyboard.readLine();
y1= Double.parseDouble(ya); //asks programmer friendly user to enter first y value
String xb;
System.out.print ("...and the 'x' coordinate of the second point: ");
xb = keyboard.readLine();
x2 = Double.parseDouble(xb); //asks programmer friendly user to enter second x value
String yb;
System.out.print ("...don't forget the 'y' coordinate of the second point: ");
yb = keyboard.readLine();
y2 = Double.parseDouble(yb); //asks programmer friendly user to enter second y value
total = Math.pow(x2 - x1, 2.0) + Math.pow(y2 - y1, 2.0); //squares the differences of values
distance = Math.sqrt(total); //finds the square root of the sum of the differences of the values
System.out.print ("E=mc^2...oh and,");
System.out.print ("the distance between point (" + xa +"," + ya +") and point("+
xb + "," + yb + ") is : " + distance);
// An application that takes the radius of a sphere and finds and prints
// the spheres volume and surface area.
double radius,volume,area;
String rad;
System.out.print("Please enter the radius of a sphere: ");
rad = keyboard.readLine();
radius = Double.parseDouble(rad); //asks programmer friendly user to enter the radius of a sphere
DecimalFormat fmt = new DecimalFormat ("0.####");
volume = ((4 * Math.PI * Math.pow(radius,3.0)) / 3) ;
System.out.println (" The sphere has a volume of:" + fmt.format(volume)); //finds and displays volume
area = ( 4 * Math.PI * Math.pow(radius, 2.0)) ;
System.out.print (" The Surface Area of the sphere is: " + fmt.format(area)); //finds and displays surface area
// An application that finds the total, in dollars and cents, of a number of quarters,
// nickels, dimes, and pennies in your piggy bank.
int pennies, nickels, dimes, quarters;
double money1;
screen.println("Empty your piggy bank and count the change, how many quarters ya have?: ");
int q = (new Integer(keyboard.readLine())).intValue();//asks programmer friendly user to enter a number of quarters
screen.println("How many dimes?: ");
int d = (new Integer(keyboard.readLine())).intValue();//asks programmer friendly user to enter a number of dimes
screen.println("How many nickels?: ");
int n = (new Integer(keyboard.readLine())).intValue();//asks programmer friendly user to enter a number of nickels
screen.println("How many pennies?: ");
int p = (new Integer(keyboard.readLine())).intValue();//asks programmer friendly user to enter a number of pennies
NumberFormat money = NumberFormat.getCurrencyInstance();
money1 = (.25 * q) + (.1 * d) + (.05 * n) + (.01 * p);
screen.println("You're rich! Total, you've got: " + money.format(money1));//finds and displays total moneyOk here is the working code as one long function:
// ^ ^
// (0)(0) A Happy Piggy Application
// Problems: 2.6,2.8,2.9,2.12 (oo)
// An application finds the total number of hours, minutes, & seconds, finds the distance
// between two points, finds the volume and surface area of a sphere, and adds up the change
// in a jar. First, the total hours, minutes, and seconds problem.
import java.io.*;
import java.text.DecimalFormat;
import java.text.NumberFormat;
public class twoptsix
static BufferedReader keyboard = new BufferedReader(new InputStreamReader(System.in));
static PrintWriter screen = new PrintWriter(System.out, true);
public static void main (String[] args) throws IOException
double hoursa, minutesa, secondsa;
String hours;
System.out.print ("Please enter a number of hours: ");
hours = keyboard.readLine();
hoursa = Double.parseDouble(hours); //asks programmer friendly user to enter hours
String minutes;
System.out.print ("Please enter a number of minutes: ");
minutes=keyboard.readLine();
minutesa = Double.parseDouble(minutes); //asks programmer friendly user to enter minutes
String seconds;
System.out.print ("Pretty please enter a number of seconds: ");
seconds = keyboard.readLine();
secondsa = Double.parseDouble(seconds); //asks programmer friendly user to enter seconds
double allseconds;
allseconds = (hoursa * 3600) + (minutesa * 60) + secondsa; //adds up all the seconds of the time entered
System.out.println ("You have: " + hours + " hours..."); //displays hours
System.out.println ("" + minutes + " minutes..."); //displays minutes
System.out.println ("and " + seconds + " seconds..."); //displays seconds
System.out.println ("to get whatever you need to done!"); //witty attempt at humor
System.out.println ("The total amount of seconds is: " + allseconds + " seconds."); //displays total seconds
// } <----- MAIN FUNCTION USED TO END HERE!!!
//but we want to keep going so remove the bracket!
// An application that finds the distance between two points when the points
// are given by the user.
// { <-- other function used to start here, but now it continues
double x1, x2, y1, y2, total, distance;
String xa;
System.out.print ("Please enter the 'x' coordinate of first point: ");
xa = keyboard.readLine();
x1 = Double.parseDouble(xa); //asks programmer friendly user to enter first x value
String ya;
System.out.print ("...also need the 'y' coordinate of first point: ");
ya = keyboard.readLine();
y1= Double.parseDouble(ya); //asks programmer friendly user to enter first y value
String xb;
System.out.print ("...and the 'x' coordinate of the second point: ");
xb = keyboard.readLine();
x2 = Double.parseDouble(xb); //asks programmer friendly user to enter second x value
String yb;
System.out.print ("...don't forget the 'y' coordinate of the second point: ");
yb = keyboard.readLine();
y2 = Double.parseDouble(yb); //asks programmer friendly user to enter second y value
total = Math.pow(x2 - x1, 2.0) + Math.pow(y2 - y1, 2.0); //squares the differences of values
distance = Math.sqrt(total); //finds the square root of the sum of the differences of the values
System.out.print ("E=mc^2...oh and,");
System.out.print ("the distance between point (" + xa +"," + ya +") and point("+
xb + "," + yb + ") is : " + distance);
//second function used to end here...
//} <--- COMMENT OUT BRACKET SO WE CONTINUE
// An application that takes the radius of a sphere and finds and prints
// the spheres volume and surface area.
//{ <--- ANOTHER ONE TO COMMENT OUT
double radius,volume,area;
String rad;
System.out.print("Please enter the radius of a sphere: ");
rad = keyboard.readLine();
radius = Double.parseDouble(rad); //asks programmer friendly user to enter the radius of a sphere
DecimalFormat fmt = new DecimalFormat ("0.####");
volume = ((4 * Math.PI * Math.pow(radius,3.0)) / 3) ;
System.out.println (" The sphere has a volume of:" + fmt.format(volume)); //finds and displays volume
area = ( 4 * Math.PI * Math.pow(radius, 2.0)) ;
System.out.print (" The Surface Area of the sphere is: " + fmt.format(area)); //finds and displays surface area
// } <----- COMMENTED OUT FOR THE SAME REASON
// An application that finds the total, in dollars and cents, of a number of quarters,
// nickels, dimes, and pennies in your piggy bank.
//{ <----AND ANOTHER
int pennies, nickels, dimes, quarters;
double money1;
screen.println("Empty your piggy bank and count the change, how many quarters ya have?: ");
int q = (new Integer(keyboard.readLine())).intValue();//asks programmer friendly user to enter a number of quarters
screen.println("How many dimes?: ");
int d = (new Integer(keyboard.readLine())).intValue();//asks programmer friendly user to enter a number of dimes
screen.println("How many nickels?: ");
int n = (new Integer(keyboard.readLine())).intValue();//asks programmer friendly user to enter a number of nickels
screen.println("How many pennies?: ");
int p = (new Integer(keyboard.readLine())).intValue();//asks programmer friendly user to enter a number of pennies
NumberFormat money = NumberFormat.getCurrencyInstance();
money1 = (.25 * q) + (.1 * d) + (.05 * n) + (.01 * p);
screen.println("You're rich! Total, you've got: " + money.format(money1));//finds and displays total money
}P.S. To make the code formatted better put [ code ] before and [ /code ] after. It's not perfect, but a little better... -
New to java(need help on access specifier)
hi! i am new to java.plzzzzz help me i have to make a project on access specifier's i know all theroy.but
i am unable to understand how i can define all specifiers practicly.i mean in a program.
thanks.plzzzzzzzz help methe most common project i can think of is a payroll system..
you can have real implementation of all the access specifiers
good luck
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