居然在简单的代码上找不出异常,关于窗体显示._J2SE

居然在简单的代码上找不出错误,关于窗体显示....

Java code

import java.awt.*;import java.awt.event.*;import javax.swing.*;public class bu extends JFrame implements ActionListener{    private  JFrame jf;    private  JButton jb1;    private  JButton jb2;    bu()    {        jf=new JFrame();        jb1=new JButton("jb1");        jb2=new JButton("jb2");        jf.setLayout(new FlowLayout());        jf.setLocation(512,384);        jf.setBounds(10,10,200,400);        jb1.addActionListener(this);        jb2.addActionListener(this);        add(jb1);        add(jb2);        setVisible(true);    }    public void actionPerformed(ActionEvent e)    {        JButton temp;        temp=(JButton)e.getSource();        if(temp==jb1) System.out.println("jb1");        if(temp==jb2) System.out.println("jb2");    }    public static void main(String args[])    {        new bu();    }}

------解决方案--------------------
LZ既然已经继承了JFrame
为什么还要在构造方法中new JFrame()?
------解决方案--------------------
太乱了写的。
class bu 。。。。。
------解决方案--------------------
import java.awt.*;
import java.awt.event.*;
import javax.swing.*;

public class bu extends JFrame implements ActionListener
{
private JFrame jf;
private JButton jb1;
private JButton jb2;
bu()
{
jf=new JFrame();
jb1=new JButton("jb1");
jb2=new JButton("jb2");
jf.getContentPane().setLayout(new FlowLayout());
jf.setLocation(512,384);
jf.setBounds(10,10,200,400);
jb1.addActionListener(this);
jb2.addActionListener(this);
jf.getContentPane().add(jb1);
jf.getContentPane().add(jb2);
setVisible(true);
}
public void actionPerformed(ActionEvent e)
{
JButton temp;
temp=(JButton)e.getSource();
if(temp==jb1) System.out.println("jb1");
if(temp==jb2) System.out.println("jb2");
}
public static void main(String args[])
{
new bu();
}
}
------解决方案--------------------
class bu本身就是ＪＦｒａｍｅ的子类　．你在里面设置了半天ｊｆ这个成员　

Java code

package com.myapp.struts;import java.awt.FlowLayout;import java.awt.event.ActionEvent;import java.awt.event.ActionListener;import javax.swing.JButton;import javax.swing.JFrame;public class Main {    public static void main(String[] args) {        new Bu();    }}class Bu extends JFrame implements ActionListener {    private JButton jb1;    private JButton jb2;    public Bu() {        jb1 = new JButton("jb1");        jb2 = new JButton("jb2");        setLayout(new FlowLayout());        setLocation(512, 384);        setBounds(10, 10, 200, 400);        jb1.addActionListener(this);        jb2.addActionListener(this);        add(jb1);        add(jb2);        setVisible(true);    }    public void actionPerformed(ActionEvent e) {        JButton temp;        temp = (JButton) e.getSource();        if (temp == jb1) {            System.out.println("jb1");        }        if (temp == jb2) {            System.out.println("jb2");        }    }}
------解决方案--------------------
Do not use javax.swing.JFrame.setLayout() use javax.swing.JFrame.getContentPane().setLayout() instead。

jf.getContentPane().setLayout(new FlowLayout()); 
jf.getContentPane().add(jb1); 
jf.getContentPane().add(jb2);