java swing中ProgressBar(進度條)的使用

/*

 * To change this template, choose Tools | Templates

 * and open the template in the editor.

 */

import java.awt.BorderLayout;

import java.awt.Color;

import java.awt.Container;

import java.awt.Dimension;

import java.awt.event.ActionEvent;

 

import java.awt.event.ActionListener;

 

import javax.swing.JButton;

import javax.swing.JFrame;

import javax.swing.JLabel;

import javax.swing.JPanel;

import javax.swing.JProgressBar;

import javax.swing.Timer;

import javax.swing.event.ChangeEvent;

import javax.swing.event.ChangeListener;

 

 

public class ProgressBar implements ActionListener,ChangeListener {

JFrame frame=null;

JProgressBar progressbar;

JLabel label;

Timer timer;

JButton b;

public ProgressBar(){

   frame=new JFrame("安裝");

   frame.setBounds(100, 100, 400, 130);

   frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);

   Container contentPanel=frame.getContentPane();

   label=new JLabel("",JLabel.CENTER);

   progressbar = new JProgressBar();

   progressbar.setOrientation(JProgressBar.HORIZONTAL);

   progressbar.setMinimum(0);

   progressbar.setMaximum(100);

   progressbar.setValue(0);

   progressbar.setStringPainted(true);

   progressbar.addChangeListener(this);

   progressbar.setPreferredSize(new Dimension(300,20));

   progressbar.setBorderPainted(true);

   progressbar.setBackground(Color.pink);

 

   JPanel panel=new JPanel();

   b=new JButton("安裝");

   b.setForeground(Color.blue);

   b.addActionListener(this);

   panel.add(b);

   timer=new Timer(100,this);

   contentPanel.add(panel,BorderLayout.NORTH);

   contentPanel.add(progressbar,BorderLayout.CENTER);

   contentPanel.add(label,BorderLayout.SOUTH);

   //frame.pack();

   frame.setVisible(true);

 

 

}

 

 

public void actionPerformed(ActionEvent e) {

   if(e.getSource()==b){

    timer.start();

   }

     if(e.getSource()==timer){

     int value=progressbar.getValue();

     if(value<100)

        progressbar.setValue(++value);

     else{

        timer.stop();

        frame.dispose();

     }

     }

 

}

 

public void stateChanged(ChangeEvent e1) {

   int value=progressbar.getValue();

   if(e1.getSource()==progressbar){

    label.setText("目前已完成進度："+Integer.toString(value)+"%");

    label.setForeground(Color.blue);

   }

 

}

public static void main(String[] args) {

   ProgressBar app=new ProgressBar();

}

 

 

}