Question

JAVA动态显示两个JPanel

我有三个JPanel， jpanelLogin，jpanelSetting，jpanelMain;，jpanelMain用来存放前两个，在jpanelLogin上有个“设置”按钮，如下图，当我单击按钮时，我想把jpanelMain里的jpanelSetting设置为可见的，我该怎么弄呢？
我这样做的话，又会出现异常。
jbtSetting.addActionListener(new ActionListener(){
public void actionPerformed(ActionEvent e){
jpanelSetting.setVisible(true);
}
});

Answer 1

应该是没什么问题的，注意你声明的jpanelSetting的位置。
具体参考这个：

import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;
import java.awt.event.WindowAdapter;
import java.awt.event.WindowEvent;
import javax.swing.*;

public class test1 extends JFrame{
JPanel jp1 = new JPanel();
JPanel jp2= new JPanel();
public void init(){

JPanel jp = new JPanel();

this.setLocation(300,300);
this.add(jp);
this.addWindowListener(new WindowAdapter()
{
public void windowClosing(WindowEvent e) {
System.exit(-1);
}

});

JButton jb1 = new JButton("Ok1");
jb1.addActionListener(new ActionListener()
{

public void actionPerformed(ActionEvent e) {
jp1.setVisible(false);
jp2.setVisible(true);
}
});
jp1.add(jb1);

JButton jb2 = new JButton("OK2");
jb2.addActionListener(new ActionListener()
{
public void actionPerformed(ActionEvent e) {
jp2.setVisible(false);
jp1.setVisible(true);
}
});
jp2.add(jb2);

jp.add(jp1);
jp.add(jp2);
jp2.setVisible(false);
pack();
this.setVisible(true);
}

public static void main(String[] args) {
test1 t = new test1();
t.init();
}
}

Answer 2

以前试过把jpanel 放在frame生成