请问JAVA Jframe加了panint方法后就显示为黑色了是为什么？

Question

public class MyGameFrame extends JFrame {public void paint(Graphics g) {g.drawLine(100,100,300,300);}/* * 初始化窗口 */public void launchFrame() {this.setTitle("打飞机小游戏");this.setVisible(true);//设置为可见this.setSize(500,500);//设置窗口的长度、宽度this.setLocation(300,300);//设置窗口的位置/** 设置关闭窗口功能*/this.addWindowListener(new WindowAdapter(){public void windowClosing(WindowEvent e) {System.exit(0);}});}public static void main(String[] args){MyGameFrame f = new MyGameFrame();f.launchFrame();f.setVisible(true);}}

Answer 1

直接把 this.Visible(true);

放到

this.addWindowListener(new WindowAdapter()

{

public void windowClosing(WindowEvent e) {

System.exit(0);

}

});

的后边就解决了