Question

Java swing Combobox里如何根据不同的选项，实时显示出不同的图片？

Answer 1

import java.awt.Container;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;

import javax.swing.ImageIcon;
import javax.swing.JComboBox;
import javax.swing.JFrame;
import javax.swing.JLabel;
import javax.swing.JPanel;

public class Test extends JFrame{
private JLabel label = null;
private JComboBox box = null;
private String img1 = "d://1.JPG";
private String img2 = "d://2.JPG";
public Test(){
setSize(500,500);
setLocation(100,50);
setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
setContentPane(getPanel());
setVisible(true);
}
private Container getPanel() {
JPanel panel = new JPanel();
panel.setLayout(null);
label = new JLabel();
//label 设置一张图片，
label.setIcon(new ImageIcon(img1));
box = new JComboBox(new String[]{"图片1","图片2"});
box.addActionListener(new ActionListener() {
@Override
public void actionPerformed(ActionEvent e) {
//获取当前选择项的下标
int i = box.getSelectedIndex();
if(i == 0){
label.setIcon(new ImageIcon(img1));
}else{
label.setIcon(new ImageIcon(img2));
}
}
});
label.setBounds(60, 10, 200, 200);
box.setBounds(60, 300, 100,40);
panel.add(label);
panel.add(box);
return panel;
}
public static void main(String[] args) {
new Test();
}
}

图片的地址自己改一下就能看到效果

Answer 2

设置监听器，有个ModifyListener监听器 给combox添加一个这个监听器的实体类，在实体类中combox选项一变就会触发这个监听器，所有你可在监听器中去设置图片