boxlayoutdemo.java

本压缩文件中含有线程的控制

package gui;

import javax.swing.*;

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

public class BoxLayoutDemo extends JFrame implements ActionListener{
	
    public static final int WIDTH = 300;
    public static final int HEIGHT = 200;
    public static final int HORIZONTAL_STRUT_SIZE = 15;
    public static final int VERTICAL_STRUT_SIZE = 10;
    
    private JPanel colorPanel;
    
    public BoxLayoutDemo(){
    	  setSize(WIDTH, HEIGHT);
          this.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
          setTitle("Box Demonstration"); 
          Container content = getContentPane( ); 
          content.setLayout(new BorderLayout( ));

          colorPanel = new JPanel( );
          colorPanel.setBackground(Color.BLUE);
          content.add(colorPanel, BorderLayout.CENTER);
          
          //Horizontal buttons at bottom of frame
          JPanel horizontalPanel = new JPanel();
          horizontalPanel.setLayout(new BoxLayout(
        		  						horizontalPanel,BoxLayout.X_AXIS));
          Component horizontalStrut = Box.createHorizontalStrut(
        		  								HORIZONTAL_STRUT_SIZE);
          horizontalPanel.add(horizontalStrut);
          
          JButton hStopButton = new JButton("Red");
          hStopButton.addActionListener(this);
          horizontalPanel.add(hStopButton);
          
          Component horizontalStrut2 = Box.createHorizontalStrut(
												HORIZONTAL_STRUT_SIZE);
          horizontalPanel.add(horizontalStrut2);
          
          JButton hGoButton = new JButton("Green");
          hGoButton.addActionListener(this);
          horizontalPanel.add(hGoButton);
          
          content.add(horizontalPanel,BorderLayout.SOUTH);
          
          //vertical buttons on right side of frame
          
          JPanel verticalPanel = new JPanel();
          verticalPanel.setLayout(new BoxLayout(
        		  						verticalPanel,BoxLayout.Y_AXIS));
          
          Component verticalStrut = Box.createVerticalStrut(
        		  VERTICAL_STRUT_SIZE); 
          verticalPanel.add(verticalStrut);

          JButton vStopButton = new JButton("Red");
          vStopButton.addActionListener(this);
          verticalPanel.add(vStopButton);

          Component verticalStrut2 = Box.createVerticalStrut(VERTICAL_STRUT_SIZE); 
          verticalPanel.add(verticalStrut2);

          JButton vGoButton = new JButton("Green");
          vGoButton.addActionListener(this); 
          verticalPanel.add(vGoButton); 
          
          content.add(verticalPanel,BorderLayout.EAST);
          
          
    }
    
    public void actionPerformed(ActionEvent e){
        if (e.getActionCommand( ).equals("Red"))
             colorPanel.setBackground(Color.RED);
         else if (e.getActionCommand( ).equals("Green"))
            colorPanel.setBackground(Color.GREEN);
         else
             System.out.println("Error in button interface.");
     }

     public static void main(String[] args){
         BoxLayoutDemo gui = new BoxLayoutDemo( );
         gui.setVisible(true);
     }
    

}