如何调用另外一个方法里的变量！谢谢

[xiaomantoubaba]

import java.awt.*;
import java.awt.event.*;
import javax.swing.*;

public class A
{
public static void main(String[] args)
{
B b=new B();
b.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
b.show();
}
}
class B extends JFrame
{
public B()
{
setTitle("Ò»´íÔÙ´í");
setSize(W,H);

C c=new C();
Container content=getContentPane();
content.add(c);
}
public static final int W=300;
public static final int H=200;
}
class C extends JPanel
{
public C()
{
JButton button1=new JButton("bule");
JButton button2=new JButton("white");

add(button1);
add(button2);

button1.addActionListener(
new ActionListener(){
public void d()
{
background=Color.blue;
}
//How to transfer the variable of another function
public void actionPerformed(ActionEvent event)
{

setBackground(background);
repaint();
}
private Color background;
});

button2.addActionListener(
new ActionListener(){

public void actionPerformed(ActionEvent event)
{
background=Color.white;
setBackground(background);
repaint();
}
private Color background;
});
}
}
麻烦大家看看这个代码啊！

public void d()
{
background=Color.blue;
}
//How to transfer the variable of another function
public void actionPerformed(ActionEvent event)
{

setBackground(background);
repaint();
}
这段有点问题（这段代码好象是没有实现调用功能的）。我想知道actionPerformed这样可以调用到public void d()里的
background呢？
我不详改成
public void actionPerformed(ActionEvent event)
{
background=Color.white;
setBackground(background);
repaint();
}
这样，我主要想知道调用别的方法里的变量是怎样作到的！谢谢大家了！

[LoveRose]

如果background这个变量时全局的，肯定试可以访问的

但是如果是函数d()的局部变量，肯定是不能访问的

因为生命周期在函数d(){}之后就结束了

[xiaomantoubaba]

public void d()
{
background=Color.blue;
}
//How to transfer the variable of another function
public void actionPerformed(ActionEvent event)
{

setBackground(background);
repaint();
}
private Color background;
});


这个private Color background;不是正是说明background是全局变量吗？

[ppopopp]

class C extends JPanel
{
private Color background;
public C()
{
JButton button1=new JButton("bule");
JButton button2=new JButton("white");

add(button1);
add(button2);

button1.addActionListener(
new ActionListener(){
public void d()
{
background=Color.blue;
}
//How to transfer the variable of another function
public void actionPerformed(ActionEvent event)
{

setBackground(background);
repaint();
}
private Color background;
});

button2.addActionListener(
new ActionListener(){

public void actionPerformed(ActionEvent event)
{
background=Color.white;
setBackground(background);
repaint();
}

});
}
}

[xiaomantoubaba]

ppopopp(虫虫1228) 大哥说的行不通咯！
这样还是局部变量啊！

[Mars_wx]

setBackground(background);如果你在调这个方法的之前没有调d()，background的值是NULL，所以你setBackground(background)之前必须调d();