为什么我点击标签，背景颜色不变化啊？请大吓帮忙碌！

Question

import java.awt.*;import java.awt.event.*;
import javax.swing.*;public class colorApp extends JFrame implements ActionListener{
private String[] color={"红","黄","蓝","绿","黑","白"};
JLabel picture;
JComboBox imgList;
public int count=0;
public colorApp(){

imgList=new JComboBox();
for(int i=1;i<7;i++)
imgList.addItem(color[count++]);
/* imgList.addActionListener(new ActionListener(){
public void actionPerformed(ActionEvent e){
String imgName=(String)imgList.getSelectedItem();
picture.setIcon(new ImageIcon("image/"+imgName));
}
});*/


imgList.addActionListener(this);
Container cp=getContentPane();
cp.add(imgList);

    

picture=new JLabel(new ImageIcon("image/"+imgList.getSelectedItem()));
picture.setOpaque(true); //JLabel默认是透明的,所以直接setBackground()没用.需加入此句
picture.setBackground(Color.red); picture.setBorder(BorderFactory.createEmptyBorder(10,0,0,0));
getContentPane().add(imgList,BorderLayout.NORTH);
getContentPane().add(picture,BorderLayout.CENTER);
setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
setSize(240,200);

}
public void actionPerformed(ActionEvent e){
if(e.getSource()=="红")
{picture.setOpaque(true);
picture.setBackground(Color.red);}
if(e.getSource()=="黄")
{picture.setOpaque(true);
picture.setBackground(Color.yellow);
}
if(e.getSource()=="蓝")
    {picture.setOpaque(true);
picture.setBackground(Color.blue);
    }
if(e.getSource()=="绿")
{picture.setOpaque(true);
picture.setBackground(Color.green);
}
    if(e.getSource()=="黑")
     {picture.setOpaque(true);
     picture.setBackground(Color.black);
     }
    if(e.getSource()=="白")
     {picture.setOpaque(true);
     picture.setBackground(Color.white);
     }


}
public static void main(String[] args){
colorApp frame=new colorApp();
    frame.setVisible(true);

}
}

Answer 1

package test;import java.awt.BorderLayout;
import java.awt.Color;
import java.awt.Container;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;import javax.swing.BorderFactory;
import javax.swing.ImageIcon;
import javax.swing.JComboBox;
import javax.swing.JFrame;
import javax.swing.JLabel;public class colorApp extends JFrame implements ActionListener {
private String[] color = { "红", "黄", "蓝", "绿", "黑", "白" };
JLabel picture;
JComboBox imgList;
public int count = 0; public colorApp() { imgList = new JComboBox();
for (int i = 1; i < 7; i++)
imgList.addItem(color[count++]); imgList.addActionListener(this);
Container cp = getContentPane();
cp.add(imgList); picture = new JLabel(
new ImageIcon("image/" + imgList.getSelectedItem()));
picture.setOpaque(true); // JLabel默认是透明的,所以直接setBackground()没用.需加入此句 picture.setBackground(Color.red); picture.setBorder(BorderFactory.createEmptyBorder(10, 0, 0, 0));
getContentPane().add(imgList, BorderLayout.NORTH);
getContentPane().add(picture, BorderLayout.CENTER);
setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
setSize(240, 200); } public void actionPerformed(ActionEvent e) {
JComboBox jb =  (JComboBox) e.getSource();
String s = jb.getSelectedItem().toString();
if (s == "红") {
picture.setOpaque(true);
picture.setBackground(Color.red);
}
if (s == "黄") {
picture.setOpaque(true);
picture.setBackground(Color.yellow);
}
if (s == "蓝") {
picture.setOpaque(true);
picture.setBackground(Color.blue);
}
if (s == "绿") {
picture.setOpaque(true);
picture.setBackground(Color.green);
}
if (s == "黑") {
picture.setOpaque(true);
picture.setBackground(Color.black);
}
if (s == "白") {
picture.setOpaque(true);
picture.setBackground(Color.white);
} } public static void main(String[] args) {
colorApp frame = new colorApp();
frame.setVisible(true); }
}楼主可以结贴了。