Question

So, for some reason when I try to use a for loop to initialize panels in chess board, it actually loops the loop itself. In other words, it doesn t go on forever, but it starts and completes again and again.

package chessgame;
import javax.swing.*;
import java.awt.*;
import java.awt.event.*;
public class ChessGame extends JFrame implements ActionListener{

    public static final int WIDTH=800;
    public static final int HEIGHT=800;

    public static void main(String[] args) {
        ChessGame gui = new ChessGame();
        gui.setVisible(true);
    }
    public ChessGame(){
        super("Chess Game Demo");
        setSize(WIDTH, HEIGHT);
        setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
        setLayout(new GridLayout(8,8));
        JPanel[] chessSquares = new JPanel[64];
        for (int a=0;a<64;a++){
            System.out.println(a);
        }
    }
}

我列入了所有可能相关的法典,因为我计划将ches块的指数用于黑白地。当我这样做时,我也看到了Null PointerException。我可以理解,鉴于以下错误,我为什么会忘记这一点,但我根本无法理解为什么要再印刷0、1.62、63份。我是新来的,对此我绝对没有任何想法。如果任何人能够解释这一点,将非常有益。感谢。

Answer 1

Don t put meaningful initialization in ChessGame s constructor, but instead override frameInit. When you do, also be sure to call super.frameInit(). See the javadoc or this tutorial.

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