使用Swing绘制Java网格

Question

我想提请使用Java网格（10×10），但我们必须使用来实现它drawRectMethod的JFrame，这是我的计划至今

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

public class Grid extends JFrame {

    public Grid() {
        setSize(500, 500);
        setVisible(true);
    }

    // draw grid
    public void paint(Graphics g) {
        for (int x = 30; x <= 300; x += 30)
            for (int y = 30; y <= 300; y += 30)
                g.drawRect(x, y, 30, 30);
    }

    public static void main(String args[]) {
        Grid application = new Grid();
        application.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
    }
}

Answer 1

该代码有效。

只需删除25

import java.awt.*;
 import javax.swing.*;
 public class Grid extends JFrame {

 public Grid()    {       
 setSize( 500, 500 );
 setVisible( true );   
 } 
public void paint( Graphics g )    
 {  
 for ( int x = 30; x <= 300; x += 30 )
 for ( int y = 30; y <= 300; y += 30 ) 
 g.drawRect( x, y, 30, 30 );

 } 
 public static void main( String args[] ) 
 {
     Grid application = new Grid();
 application.setDefaultCloseOperation( JFrame.EXIT_ON_CLOSE );   }  }