为什么我的JPanel中加不进控件

Question

class JiePanel extends JPanel {
LittleJie littleJie = null;
public JiePanel() {
this.setLayout(new FlowLayout(FlowLayout.LEFT));
} public void template() throws Exception {

littleJie = new LittleJie(“101”,“你好”);
littleJie.addType(）
this.add(littleJie);
} }}class LittleJie extends JPanel { ImageIcon img = new ImageIcon("jie.jpg"); public LittleJie() {
this.setSize(77,100);
this.setLayout(new GridLayout(3,1)); }
@Override
public void paint(Graphics g) {
super.paint(g);
g.drawImage(img.getImage(), 0, 0,this);
}
public void addType(String id, String type) {
JLabel idJLabel = new JLabel(id);
this.add(idJLabel);
JLabel typeJLabel = new JLabel(type);
this.add(typeJLabel);
}
}我想在一个大的 JiePanel 里面画加一个小的LittleJie  ，LittleJie上面是一个图片img, 下面是两行字idJLabel和typeJLabel但是结果是显示那个小图片，却没有显示字，求大虾们帮助啊

Answer 1

如果你想自己绘制组件，组件边框，子组件，那就重写 paint(Graphics g)方法。否则重写 paintComponent(Graphics g).

Answer 2

两个标签肯定是可以显示出来的，图片没显示出来可能有以下几个原因
1.你的图片路径问题，没有找到
2.你写的程序调用有问题，this.setSize(77,100);本身给的显示大小也太小了，随便一个小头像就能遮住文字我下面给你的例子是一个能显示的，但是图片会遮盖到一部分文字，基本上你的重写JPanel的代码逻辑是正确的
package csdn.p6;import javax.swing.*;
import java.awt.*;class JiePanel extends JPanel {
    LittleJie littleJie = null;
    
    public JiePanel() {
        this.setLayout(new FlowLayout(FlowLayout.LEFT));
    }    public void template() throws Exception {        littleJie = new LittleJie();
        littleJie.addType("101","你好");
        this.add(littleJie);
        this.validate();
    }    public static void main(String[] args)throws Exception{
        JFrame frame=new JFrame("demo");
        Container c=frame.getContentPane();
        JiePanel jp=new JiePanel();
        jp.template();
        c.add(jp);        frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
        frame.setLocationRelativeTo(null);
        frame.pack();
        frame.setVisible(true);
        
    }
}class LittleJie extends JPanel {    ImageIcon img = new ImageIcon("resources/images/thu.jpg");//改成小一些的图片地址    public LittleJie() {
        this.setSize(700,800);
        this.setLayout(new GridLayout(3,1));    }
    @Override
    public void paint(Graphics g) {
        super.paint(g);
        g.drawImage(img.getImage(), 0, 0,this);
        System.out.println("--------");
    }
    public void addType(String id, String type) {
        JLabel idJLabel = new JLabel(id);
        this.add(idJLabel);
        JLabel typeJLabel = new JLabel(type);
        this.add(typeJLabel);
        this.add(new JButton("test",img));
    }
}

Answer 3

import javax.swing.*;
import java.awt.*;public class JiePanel extends JPanel {
    LittleJie littleJie = null;
    public JiePanel() {
        super(new FlowLayout(FlowLayout.LEFT));
    }    public void template() {
        littleJie = new LittleJie();
        littleJie.addType("101","你好");
        add(littleJie);
    }    public static void main(String[] args) {
        java.awt.EventQueue.invokeLater(new Runnable(){
                @Override public void run(){
                    JFrame frame = new JFrame("demo");
                    Container c = frame.getContentPane();
                    JiePanel jp = new JiePanel();
                    jp.template();
                    c.add(jp);
                    frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
                    frame.setLocationRelativeTo(null);
                    frame.pack();
                    frame.setVisible(true);
                }
            });
    }
    class LittleJie extends JPanel {
        ImageIcon img = new ImageIcon("thu.jpg");
        public LittleJie(){
            super(new GridLayout(3,1));
            setPreferredSize(new Dimension(img.getIconWidth(),img.getIconHeight()));
        }        @Override public void paintComponent(Graphics g){
            super.paintComponent(g);
            g.drawImage(img.getImage(), 0, 0,this);
        }        public void addType(String id, String type) {
            JLabel idJLabel = new JLabel(id);
            add(idJLabel);
            JLabel typeJLabel = new JLabel(type);
            add(typeJLabel);
            add(new JButton("Hi"));
        }
    }
}

Answer 4

图片显示出来了，但是下面的两个Label没有显示来啊，这是怎么个情况