请问这是怎么错了啊？

Question

import javax.swing.*;
import java.awt.event.*;
import java.awt.*;public class MyFlowLayoutDemo extends Frame{
// private final JPanel jpanel = new JPanel();
private final String name[] = {"left","center","right"};
private final Button jbutton[] = new Button[3];
private final FlowLayout flowLayout = new FlowLayout();
ActionListener listener = new ActionListener(){
public void actionPerformed(ActionEvent event){
if(((Button)event.getSource()).getLabel().equals("left")){
//// System.out.print("left");
flowLayout.setAlignment(FlowLayout.LEFT);
flowLayout.layoutContainer(this);
}
if(((Button)event.getSource()).getLabel().equals("right")){
flowLayout.setAlignment(FlowLayout.RIGHT);
// System.out.println("right");
}
else flowLayout.setAlignment(FlowLayout.CENTER);
 
}
};

public MyFlowLayoutDemo(){
super();
// add(jpanel,BorderLayout.CENTER);
setLayout(flowLayout);
for(int i=0;i<jbutton.length;i++){
jbutton[i] = new Button(name[i]);
add(jbutton[i]);
jbutton[i].addActionListener(listener);
}
setSize(500,250);
setVisible(true);

}
public static void main(String[] args){
new MyFlowLayoutDemo();
}
}
MyFlowLayoutDemo.java:15: 无法将 layoutContainer 中的 方法 应用于 java.awt.Cont
iner(<匿名 java.awt.event.ActionListener>)
                                flowLayout.layoutContainer(this);
                                          ^
1 错误
请问这是为什么呀？

Answer 1

import javax.swing.*;
import java.awt.event.*;
import java.awt.*;public class MyFlowLayoutDemo extends Frame{
//Frame f=new Frame();
// private final JPanel jpanel = new JPanel();
private final String name[] = {"left","center","right"};
private final Button jbutton[] = new Button[3];
private final FlowLayout flowLayout = new FlowLayout();
ActionListener listener = new ActionListener(){
public void actionPerformed(ActionEvent event){
if(((Button)event.getSource()).getLabel().equals("left")){
////  System.out.print("left");
flowLayout.setAlignment(FlowLayout.LEFT);
/*flowLayout.layoutContainer(this);*/
Container con=getParent();
con.setLayout(flowLayout);
}
if(((Button)event.getSource()).getLabel().equals("right")){
flowLayout.setAlignment(FlowLayout.RIGHT);
//  System.out.println("right");
}
else flowLayout.setAlignment(FlowLayout.CENTER);
  
}
};public MyFlowLayoutDemo(){
super();
//  add(jpanel,BorderLayout.CENTER);
setLayout(flowLayout);
for(int i=0;i<jbutton.length;i++){
jbutton[i] = new Button(name[i]);
add(jbutton[i]);
jbutton[i].addActionListener(listener);
}
setSize(500,250);
setVisible(true);}
public static void main(String[] args){
new MyFlowLayoutDemo();
}
}
提示很清楚  layoutContainer 中的 方法不能在你的程序  使用  你用Container ,但是你的代码有其他错误！你自己再看看

Answer 2

另外 把你的 if语句改为if(e.getActionCommand().equals("left")) 这样判断会好一些...

Answer 3

flowLayout.layoutContainer(this); //这里的this指的是内部类对象本身，而你要用的外部类的this，所以改成
flowLayout.layoutContainer(MyFlowLayoutDemo.this);