Java开发网 - 实现，JFrame上一JButton，点击JBtton来放大JFrame

Topic: 实现，JFrame上一JButton，点击JBtton来放大JFrame

1.实现，JFrame上一JButton，点击JBtton来放大JFrame

Posted by: 234aini
Posted on: 2004-11-06 11:59

我要实现标题所说的功能，但是参数去却没有办法传递，
请问，怎么样才可以将事件处理程序中的参数传出来呢？


import javax.swing.*;
import java.awt.event.*;
import java.awt.*;
public class jframe {

  public static void main(String[] args) {
    JFrame jj=new JFrame("adjust");
     int size=200;
    JButton big=new JButton("BIG");
    JButton small=new JButton("SMALL");
    big.addActionListener(new ActionListener(){
      protected int i=1;
      public void actionPerformed(ActionEvent e)
      {
        
        System.out.println(i++);
      }
    });
    small.addActionListener(new ActionListener(){
      protected int j=20;
      public void actionPerformed(ActionEvent e)
      {
        
        System.out.println(j++);
      }
    });
    jj.addWindowListener(new WindowAdapter()
    {
      public void WindowClosing(WindowEvent e)
      {
        System.exit(0);
          }
      });  
    jj.getContentPane().add(big,"North");
    jj.getContentPane().add(small,"South");
    jj.setSize(size,size);
    jj.setVisible(true);
  }
}

2.Re:实现，JFrame上一JButton，点击JBtton来放大JFrame [Re: 234aini]	Copy to clipboard
Posted by: kavinwang Posted on: 2004-11-06 12:04 你想怎样传参数呢，举个例子或说明白。

3.Re:实现，JFrame上一JButton，点击JBtton来放大JFrame [Re: 234aini]	Copy to clipboard
Posted by: 234aini Posted on: 2004-11-06 12:04 我想用i，j来作为方法jj.setsize（）的参数，怎么样传递呢？

4.Re:实现，JFrame上一JButton，点击JBtton来放大JFrame [Re: 234aini]	Copy to clipboard
Posted by: kavinwang Posted on: 2004-11-06 12:14 你把 i、j 提到内部类的外面，比如放在main的开头。 public void static main(String[] args){ int i,j; .... ... }

5.Re:实现，JFrame上一JButton，点击JBtton来放大JFrame [Re: 234aini]

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Posted by: 234aini
Posted on: 2004-11-06 12:16

C:\eclipse\workspace\net\jframe.java:36: local variable i is accessed from within inner class; needs to be declared final
System.out.println(i++);
^
C:\eclipse\workspace\net\jframe.java:45: local variable i is accessed from within inner class; needs to be declared final
System.out.println(i--);
^
2 errors

Process completed.

实验了。报错。上面是错误

6.Re:实现，JFrame上一JButton，点击JBtton来放大JFrame [Re: 234aini]

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Posted by: 234aini
Posted on: 2004-11-06 12:17

修改后的代码：

import javax.swing.*;
import java.awt.event.*;
import java.awt.*;
public class jframe {

  public static void main(String[] args) {
    JFrame jj=new JFrame("adjust");

     int i=200;

    JButton big=new JButton("BIG");
    JButton small=new JButton("SMALL");
    big.addActionListener(new ActionListener(){

      public void actionPerformed(ActionEvent e)
      {

        System.out.println(i++);

        }
    });
    small.addActionListener(new ActionListener(){

      public void actionPerformed(ActionEvent e)
      {

        System.out.println(i--);
      }
    });
    jj.addWindowListener(new WindowAdapter()
    {
      public void WindowClosing(WindowEvent e)
      {
        System.exit(0);
   }
   });
    jj.getContentPane().add(big,"North");
    jj.getContentPane().add(small,"South");
    jj.setSize(i,i);
    jj.setVisible(true);
  }
}