当我将组件的大小设置为超出组件位置的x和y时,它们都会显示出来,否则它们就不会出现.

这是我的代码：

public class AdamakPogram{

public static void main(String[] args) {

PlayGround playGround = new PlayGround();

Adamak ad1 = new Adamak();

Adamak ad2 = new Adamak();

ad1.setLocation(100,100);

ad2.setLocation(150, 100);

ad1.addMouseListener(new FocusListener(ad1));

ad1.addKeyListener(new ArrowListener(ad1));

playGround.addPerson(ad1);

ad2.addMouseListener(new FocusListener(ad2));

ad2.addKeyListener(new ArrowListener(ad2));

playGround.addPerson(ad2);

}

}

我的PlayGround课程：

import javax.swing.JFrame;

import javax.swing.JPanel;

import javax.swing.border.EmptyBorder;

public class PlayGround extends JFrame{

private static final long serialVersionUID = 1L;

private JPanel zone;

public PlayGround() {

setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);

setBounds(100, 100, 800, 600);

setResizable(false);

zone = new JPanel();

zone.setBorder(new EmptyBorder(5, 5, 5, 5));

zone.setBounds(100, 100, 800, 600);

setContentPane(zone);

zone.setLayout(null);

setVisible(true);

}

public void addPerson(Adamak adamak){

zone.add(adamak);

revalidate();

repaint();

}

public JPanel getZone() {

return zone;

}

public void setZone(JPanel zone) {

this.zone = zone;

}

}

我的adamak(自定义组件)类：

import java.awt.Graphics;

import java.awt.Point;

import javax.swing.JComponent;

public class Adamak extends JComponent {

private static final long serialVersionUID = 1L;

@Override

protected void paintComponent(Graphics arg0) {

super.paintComponent(arg0);

Point point = getLocation();

arg0.drawRect(point.x-10, point.y-10, 20, 50);//drawing stomach

arg0.drawLine(point.x+10,point.y, point.x+20, point.y+50);//drawing right hand

arg0.drawLine(point.x-10, point.y, point.x-20, point.y+50);//drawing left hand

arg0.drawLine(point.x, point.y-10, point.x, point.y-20);//drawing neck

arg0.drawLine(point.x-5, point.y+40, point.x-5, point.y+100);//drawing left leg

arg0.drawLine(point.x+5, point.y+40, point.x+5, point.y+100);//drawing right leg

arg0.drawOval(point.x-10, point.y-40, 23, 20);//drawing head

arg0.drawRect(point.x-20, point.y-40, 40, 140);

}

public void moveRight(){

Point point = getLocation();

if((point.x+1-20) < 710){

setLocation(new Point(point.x+1, point.y));

setBounds(point.x-20,point.y-40,710-40,461-140);

repaint();

}

}

public void moveLeft(){

Point point = getLocation();

if((point.x-1-20) > 0){

setLocation(new Point(point.x-1,point.y));

setBounds(point.x-20,point.y-40,710-40,461-140);

repaint();

}

}

public void moveUp(){

Point point = getLocation();

if((point.y-1-40) > 0){

setLocation(new Point(point.x,point.y-1));

setBounds(point.x-20,point.y-40,710-40,461-140);

repaint();

}

}

public void moveDown(){

Point point = getLocation();

if((point.y+1-100) < 461){

setLocation(new Point(point.x,point.y+1));

setBounds(point.x-20,point.y-40,710-40,461-140);

repaint();

}

}

}

任何帮助,将不胜感激.