Error With Java Code - Developers

I'm not sure what's wrong with it. It's saying 4 errors found: File: J:\Java\Java Acces\bookClasses\craps.java [line: 11] Error: J:\Java\Java Acces\bookClasses\craps.java:11: craps is not abstract and does not override abstract method actionPerformed(java.awt.event.ActionEvent) in java.awt.event.ActionListener File: J:\Java\Java Acces\bookClasses\craps.java [line: 24] Error: J:\Java\Java Acces\bookClasses\craps.java:24: cannot find symbol symbol : class JLabe1 location: class craps File: J:\Java\Java Acces\bookClasses\craps.java [line: 54] Error: J:\Java\Java Acces\bookClasses\craps.java:54: cannot find symbol symbol : variable sumLabel location: class craps File: J:\Java\Java Acces\bookClasses\craps.java [line: 55] Error: J:\Java\Java Acces\bookClasses\craps.java:55: cannot find symbol symbol : variable sumLabel location: class craps And it's weird, because I have ALL of the required packages. I'm fairly new at this, but I really enjoy it. Any help would be greatly appreciated. Here is the code [code]//Craps //import java core packages import java.awt.*; import java.awt.event.*; //java extension packages import javax.swing.*; public class craps extends JApplet implements ActionListener { //constant variables for game status final int WON = 0, LOST = 1, CONTINUE = 2; //other variables used boolean firstRoll = true; int sumOfDice = 0; int myPoint = 0; int gameStatus = CONTINUE; //graffic UI components JLabe1 die1Label, die2Label, sumlabel, pointLabel; JTextField die1Field, die2Field, sumField, pointField; JButton rollButton; //set up GUI components public void init () { //open content pane and change its layout to a FlowLayout Container container = getContentPane(); container.setLayout ( new FlowLayout () ); //create label and text field for die 1 die1Label = new JLabel ( "Die 1" ); container.add ( die1Label ); die1Field = new JTextField( 10 ); die1Field.setEditable ( false ); container.add ( die1Field ); //create label and text field for die 2 die2Label = new JLabel ( "Die 2" ); container.add ( die1Label ); die2Field = new JTextField( 10 ); die2Field.setEditable ( false ); container.add ( die2Field ); //create label and text field for sum sumLabel = new JLabel ( "Sum is" ); container.add ( sumLabel ); sumField = new JTextField( 10 ); sumField.setEditable ( false ); container.add ( sumField ); //create label and text field for point pointLabel = new JLabel ( "Point is" ); container.add ( pointLabel ); pointField = new JTextField( 10 ); pointField.setEditable ( false ); container.add ( pointField ); //create button use clicks to roll the die rollButton = new JButton ( "Roll die" ); rollButton.addActionListener ( this); container.add ( rollButton ); } //process one roll of dice public void actionPreformed ( ActionEvent actionEvent ) { //first roll of dice if ( firstRoll ) { sumOfDice = rollDice(); switch ( sumOfDice) { //win on the first roll case 7: case 11: gameStatus = WON; pointField.setText( " " ); //clear point field break; //lose on the first roll case 2: case 3: case 12: gameStatus = LOST; pointField.setText( " "); break; //remember point default: gameStatus = CONTINUE; myPoint = sumOfDice; pointField.setText ( Integer.toString ( myPoint ) ); firstRoll = false; break; } } //subsequent roll of dice else { sumOfDice = rollDice(); //determines game status if ( sumOfDice == myPoint ) gameStatus =WON; else if (sumOfDice == 7 ) gameStatus = LOST; } displayMessage(); } public int rollDice() { int die1, die2, sum; die1= 1 + (int ) (Math.random() * 6 ); die2= 2 + ( int ) (Math.random() * 6) ; sum = die1 + die2; die1Field.setText ( Integer.toString ( die1 ) ); die2Field.setText ( Integer.toString (die2 ) ); sumField.setText ( Integer.toString ( sum ) ); return sum; } public void displayMessage () { //if the game were to continue if (gameStatus == CONTINUE ) showStatus ( " Roll Again. " ); else { if (gameStatus ==WON ) showStatus ( "Player Wins!! :D " + "Click Roll Dice to play again." ); else showStatus( "Player Loses. " + "Click Roll Dice to play again." ); firstRoll = true; } } } [/code]

Well with my very limited Java experience so far, this error: [code]Error: J:\Java\Java Acces\bookClasses\craps.java:11: craps is not abstract and does not override abstract method actionPerformed(java.awt.event.ActionEvent) in java.awt.event.ActionListener[/code]Your craps class implements interface ActionListener, which is abstract and has a method actionPerformed that needs to be overridden. So you need a method called actionPerformed that returns the same data type (int, double) and accepts the same parameters as the interface. Like I said though, I don't have all that much experience, and in my Java class we just started on interfaces/classes. Which looking at your code again, you just misspelled actionPerformed, on line 74. The other errors, I don't know about.

Yes, make sure you have all functions that you're implementing from abstract classes and use [b]@Override[/b].

Thanks for the help! But how do I do an @Override? I don't necessarily want it done for me, I just need help/hints/examples.

You just put @Override on the line above the method that overrides the one in the interface. It isn't necessary though, it's just good to do so. [code] @Override public void actionPerformed ( ActionEvent actionEvent ) { //first roll of dice if ( firstRoll ) { sumOfDice = rollDice(); switch ( sumOfDice) { //win on the first roll case 7: case 11: gameStatus = WON; pointField.setText( " " ); //clear point field break; //lose on the first roll case 2: case 3: case 12: gameStatus = LOST; pointField.setText( " "); break; //remember point default: gameStatus = CONTINUE; myPoint = sumOfDice; pointField.setText ( Integer.toString ( myPoint ) ); firstRoll = false; break; } } [/code]

[QUOTE=GetBent;25547638]You just put @Override on the line above the method that overrides the one in the interface. It isn't necessary though, it's just good to do so.[/QUOTE] What does that do? I never learned about that when I was taught Java.

[QUOTE=Werem00se;25538307] File: J:\Java\Java Acces\bookClasses\craps.java [line: 11] Error: J:\Java\Java Acces\bookClasses\craps.java:11: craps is not abstract and does not override abstract method actionPerformed(java.awt.event.ActionEvent) in java.awt.event.ActionListener [B]Explanation: You're not overwriting actionPerformed Properly (explained before)[/B] File: J:\Java\Java Acces\bookClasses\craps.java [line: 24] Error: J:\Java\Java Acces\bookClasses\craps.java:24: cannot find symbol symbol : class JLabe1 location: class craps [B]Explanation: On line 24 you use an object named JLabel1. There are no labels in scope with that name[/B] File: J:\Java\Java Acces\bookClasses\craps.java [line: 54] Error: J:\Java\Java Acces\bookClasses\craps.java:54: cannot find symbol symbol : variable sumLabel location: class craps [B]Explanation: On line 54 you use an object named sumLabel. There are no labels in scope with that name[/B] File: J:\Java\Java Acces\bookClasses\craps.java [line: 55] Error: J:\Java\Java Acces\bookClasses\craps.java:55: cannot find symbol symbol : variable sumLabel location: class craps [B]Explanation: On line 55 you use an object named sumLabel. There are no labels in scope with that name[/B] [/QUOTE] The last three errors are here because you used the wrong name to refer to your labels. Just change the name to the right one. [editline]22nd October 2010[/editline] When posting code you should use (no spaces in the []) [code] [ cpp ]yourcodehere[/ cpp ] [/code] It will do C++ syntax highlighting and will show the line numbers. (I don't know if there's one for java)

[QUOTE=Larikang;25562229]What does that do? I never learned about that when I was taught Java.[/QUOTE] It's just a tool to help prevent misspelling a method name and make sure you are actually overriding a method. For example, you are trying to override a method called getSum from another class. In the child class you try to override that method like so: [code] @Override getSmu(){ ... } [/code]Because you have the @Override, and getSum is misspelled, it recognizes that it actually doesn't override anything and gives you an error.