Question

JAVA边界布局管理器BorderLayout程序问题

从网上找了一些关于java.awt包的程序，用myeclipse敲出来以后，有些地方会提示报错，仔细对照了一下，代码也没有抄错，麻烦大神帮忙看一下，告知报错原因。完整代码如下：
package com.awtstudy;

import java.awt.*;
import java.awt.event.*;

public class BorderLayoutDemo {
private final String[] names = { "Hide North", "Hide South", "Hide East",
"Hide West", "Hide Center" };
private final String[] locations = { BorderLayout.NORTH,
BorderLayout.SOUTH, BorderLayout.EAST, BorderLayout.EAST,
BorderLayout.WEST, BorderLayout.CENTER };
private Button[] buttons = new Button[5];
// 构造函数
public BorderLayoutDemo(String title){
super(title);
final BorderLayout layout = (BorderLayout)this.getLayout();
ActionListener listener = new ActionListener() {
public void actionPerformed(ActionEvent event) {
for (int i = 0; i < buttons.length; i++) {
if (event.getSource() == buttons[i]) {
buttons[i].setVisible(false);
} else {
buttons[i].setVisible(true);
}
}
layout.layoutContainer(BorderLayoutDemo.this);
}
};
for (int i = 0; i < buttons.length; i++) {
buttons[i] = new Button(names[i]);
buttons[i].addActionListener(listener);
add(buttons[i], locations[i]);
}
setSize(250, 250);
setVisible(true);
}
public static void main(String[] args) {
new BorderLayoutDemo("HELLO");
}
}
具体报错提示如下：





Answer 1

public class BorderLayoutDemo extends JFrame{
这行这样改 请采纳

Answer 2

类 继承下 JFrame 或者 Frame

追问

具体怎么修改能告知一下嘛，小白想学习一下。

追答

public class BorderLayoutDemo extends JFrame