Exception in thread "main"

[russellty]

When i run my program, it gives me this error:

Exception in thread "main" java.lang.Error: Unresolved compilation problem: 

	at main.Start.main(Start.java:31)

my entire class is here:

package main;

import java.awt.*;
import javax.swing.*;

import java.awt.event.*;


@SuppressWarnings("serial")
public class Start extends JFrame {
	

	
	ImageIcon redSquare = new ImageIcon(Start.class.getResource("/main/red.jpg")), 
			blackSquare = new ImageIcon(Start.class.getResource("/main/black.jpg")), 
			redChecker = new ImageIcon(Start.class.getResource("/main/redChecker.jpg")), 
			whiteChecker = new ImageIcon(Start.class.getResource("/main/whiteChecker.jpg")), 
			redCheckerKing = new ImageIcon(Start.class.getResource("/main/redCheckerKing.jpg")), 
			whiteCheckerKing = new ImageIcon(Start.class.getResource("/main/whiteCheckerKing.jpg")), 
			selectedRedChecker =  new ImageIcon(Start.class.getResource("/main/selectedRedChecker.jpg")), 
			selectedWhiteChecker =  new ImageIcon(Start.class.getResource("/main/selectedWhiteChecker.jpg")), 
			selectedRedCheckerKing =  new ImageIcon(Start.class.getResource("/main/selectedRedCheckerKing.jpg")),
			selectedWhiteCheckerKing =  new ImageIcon(Start.class.getResource("/main/selectedWhiteCheckerKing.jpg"));
	
	GridBagConstraints c = new GridBagConstraints();
	GridBagLayout layout = new GridBagLayout();
	
	JLabel[][] loacation = new JLabel[8][8];
	
	
	public static void main(String[] args){
		new Start();
	}
	
	public Start(){
		
		for(int counter0 = 0; counter0 <= 7; counter0 ++){
			for(int counter1 = 0; counter1 <= 7; counter1 ++){
				if(counter0 % 2 == 0){
					if(counter1%2 == 0){
						loacation[counter0][counter1] = new JLabel(new ImageIcon(Start.class.getResource("/main/red.jpg")));
					}else{
						loacation[counter0][counter1] = new JLabel(new ImageIcon(Start.class.getResource("/main/black.jpg")));
					}
				}else{
					if(counter1 % 2 == 0){
						loacation[counter0][counter1] = new JLabel(new ImageIcon(Start.class.getResource("/main/black.jpg")));
					}else{
						loacation[counter0][counter1] = new JLabel(new ImageIcon(Start.class.getResource("/main/red.jpg")));
					}
				}
			}
		}
		setResizable(false);
		setBounds(10, 10, 600, 600);
		
		setLayout(layout);
		
		for (int counter0 = 0; counter0 <= 7; counter0++){
			c.gridy = counter0;
			for (int counter1 = 0; counter1 <=7; counter1++){
				c.gridx = counter1;
				add(loacation[counter0][counter1], c);
			}
		}
		
		setTitle("Checkers");
		
		setVisible(true);
		
		for(int counter = 1; counter <= 7; counter += 2)
			loacation[0][counter].setIcon(redChecker);
		
		for(int counter = 0; counter <= 7; counter += 2)
			loacation[1][counter].setIcon(redChecker);
		
		for(int counter = 1; counter <= 7; counter += 2)
			loacation[2][counter].setIcon(redChecker);
		
		
		for(int counter = 0; counter <= 7; counter += 2)
			loacation[5][counter].setIcon(whiteChecker);
		
		for(int counter = 1; counter <= 7; counter += 2)
			loacation[6][counter].setIcon(whiteChecker);
		
		for(int counter = 0; counter <= 7; counter += 2)
			loacation[7][counter].setIcon(whiteChecker);
		
		
		
		
		
		for(int counter = 0; counter <= 7; counter++){
			for(int counter1 = 0; counter1 <= 7; counter1++){
				
				loacation[counter][counter1].addMouseListener(new MouseAdapter() {
					@Override
					public void mouseClicked(MouseEvent e) {
							
							
							if(((JLabel) e.getSource()).getIcon() == redChecker){
								unCheck();
								((JLabel) e.getSource()).setIcon(selectedRedChecker);
							}else if(((JLabel) e.getSource()).getIcon() == whiteChecker){
								unCheck();
								((JLabel) e.getSource()).setIcon(selectedWhiteChecker);
							}else if(((JLabel) e.getSource()).getIcon() == redCheckerKing){
								unCheck();
								((JLabel) e.getSource()).setIcon(selectedRedCheckerKing);
							}else if(((JLabel) e.getSource()).getIcon() == whiteCheckerKing){
								unCheck();
								((JLabel) e.getSource()).setIcon(selectedWhiteCheckerKing);
							}else if(((JLabel) e.getSource()).getIcon() == blackSquare ){
								move(((JLabel) e.getSource()));
								System.out.println("J");
							}
						
						}
				});
				
			}
		}
		
		
	}
	
	public void move(JLabel destination){
		
		System.out.println(getSelectedSquare());
		
	}
	
	
	public void unCheck(){
		
		for(int counter2 = 0; counter2 <= 7; counter2++){
			for(int counter3 = 0; counter3 <= 7; counter3++){
				if(loacation[counter2][counter3].getIcon() == selectedRedChecker){
					loacation[counter2][counter3].setIcon(redChecker);
				}else if(loacation[counter2][counter3].getIcon() == selectedWhiteChecker){
					loacation[counter2][counter3].setIcon(whiteChecker);
				}else if(loacation[counter2][counter3].getIcon() == selectedRedCheckerKing){
					loacation[counter2][counter3].setIcon(redCheckerKing);
				}else if(loacation[counter2][counter3].getIcon() == selectedWhiteCheckerKing){
					loacation[counter2][counter3].setIcon(whiteCheckerKing);
				}
			}
		}
		
	}
	
		
	public JLabel getSelectedSquare(){
		
		
		
		for(int counter2 = 0; counter2 <= 7; counter2 ++){
			for(int counter3 = 0; counter3 <= 7; counter3++){

				if(loacation[counter2][counter3].getIcon() == selectedRedChecker ||
						loacation[counter2][counter3].getIcon() == selectedWhiteChecker ||
						loacation[counter2][counter3].getIcon() == selectedRedCheckerKing ||
						loacation[counter2][counter3].getIcon() == selectedWhiteCheckerKing){
					return loacation[counter2][counter3];
					
				}	
			}
		}
		
		return null;
		
	}

Thanks in advance

[Norm]

Can you compile the program with the javac command and get the error messages from the compiler?
The javac compiler gives better error messages than your IDE.

[russellty]

How do I use the Javac compiler again? I never really used it...

[Norm]

Open a command prompt window, change to the directory(use CD command) with the .java source file and enter the javac command:
javac <SOURCEFILENAME>.java

[russellty]

it just says "javac is not a recognized internal or external command, operable program or batch file

[DarrylBurke]

Lesson: Common Problems (and Their Solutions) (The Java™ Tutorials > Getting Started)
JDK Installation for Microsoft Windows

db

[russellty]

wierd. i just tryed running it in eclipse and it worked fine. thanks all!