这是《core java》里面的一个按钮测试的程序
import java.awt.*;
import java.awt.event.*;
import javax.swing.*;
public class ButtonTest {
public static void main(String[] agrs)
{
ButtonFrame frame = new ButtonFrame();
frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
frame.show();
}
}
class ButtonFrame extends JFrame
{
public ButtonFrame()
{
setTitle( "ButtonTest ");
setSize(300, 200);
ButtonPanel panel = new ButtonPanel();
Container contentPane = getContentPane();
contentPane.add(panel);
}
}
class ButtonPanel extends JPanel
{
public ButtonPanel()
{
JButton yellowButton = new JButton( "Yellow ");
JButton blueButton = new JButton( "Blue ");
JButton redButton = new JButton( "Red ");
add(yellowButton);
add(redButton);
add(blueButton);
ColorAction yellowAction = new ColorAction(Color.YELLOW);
ColorAction blueAction = new ColorAction(Color.BLUE);
ColorAction redAction = new ColorAction(Color.RED);
yellowButton.addActionListener(yellowAction);
blueButton.addActionListener(blueAction);
redButton.addActionListener(redAction);
}
private class ColorAction implements ActionListener
{
public ColorAction(Color c)
{
backgroundColor = c;
}
public void actionPerformed(ActionEvent event)
{
setBackground(backgroundColor);
}
private Color backgroundColor;
}
}
请问下按钮的位置可不可以自定义的啊？
谢谢！
------解决方案--------------------
Panel的布局方式默认是FlowLayout(没记错的话),就是说加上去的按钮是挨个往上放的,位置自己不能设定,要想自己设置位置,那么这样改
class ButtonPanel extends JPanel
{
public ButtonPanel()
{
this.setLayout(null);
JButton yellowButton = new JButton( "Yellow ");
JButton blueButton = new JButton( "Blue ");
JButton redButton = new JButton( "Red ");
yellowButton.setBounds(左上角坐标X，左上角坐标Y，按钮宽度，按钮高度);
redButton.setBounds(左上角坐标X，左上角坐标Y，按钮宽度，按钮高度);
blueButton.setBounds(左上角坐标X，左上角坐标Y，按钮宽度，按钮高度);
add(yellowButton);
add(redButton);
add(blueButton);
ColorAction yellowAction = new ColorAction(Color.YELLOW);
ColorAction blueAction = new ColorAction(Color.BLUE);
ColorAction redAction = new ColorAction(Color.RED);
yellowButton.addActionListener(yellowAction);
blueButton.addActionListener(blueAction);
redButton.addActionListener(redAction);
}
private class ColorAction implements ActionListener
{
public ColorAction(Color c)