ProgressBar使用小例子
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package com.xhm.test;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;
import javax.swing.BorderFactory;
import javax.swing.JButton;
import javax.swing.JFrame;
import javax.swing.JLabel;
import javax.swing.JProgressBar;
import javax.swing.Timer;
public class ProgressBarTest extends JFrame {
??? private JProgressBar bar;
??? private JButton bt;
??? private JLabel lab;
??? private Timer timer;
??? public ProgressBarTest() {
??? ??? init();
??? ??? setTitle("ProgressBarTest");
??? ??? setSize(400, 300);
??? ??? setLocationRelativeTo(null);
??? }
??? private void init() {
??? ??? setLayout(null);
??? ??? bt = new JButton();
??? ??? bt.setSize(100, 30);
??? ??? bt.setLocation(100, 50);
??? ??? bt.setText("Start");
??? ??? bt.addActionListener(new ActionListener() {
??? ??? ??? public void actionPerformed(ActionEvent e) {
??? ??? ??? ??? bt_click(e);
??? ??? ??? }
??? ??? });
??? ??? add(bt);
??? ??? bar = new JProgressBar();
??? ??? bar.setBorder(BorderFactory.createEtchedBorder());
??? ??? bar.setLocation(50, 100);
??? ??? bar.setSize(200, 15);
??? ??? bar.setMinimum(0);
??? ??? bar.setMaximum(100);
??? ??? bar.setStringPainted(true);
??? ??? add(bar);
??? ??? lab = new JLabel();
??? ??? lab.setSize(100, 30);
??? ??? lab.setLocation(100, 150);
??? ??? lab.setText("");
??? ??? add(lab);
??? ??? timer = new Timer(50, bt.getActionListeners()[0]);
??? ??? timer.addActionListener(new ActionListener() {
??? ??? ??? public void actionPerformed(ActionEvent e) {
??? ??? ??? ??? timer_action(e);
??? ??? ??? }
??? ??? });
??? }
??? private void bt_click(ActionEvent e) {
??? ??? try {
??? ??? ??? timer.start();
??? ??? } catch (Exception ee) {
??? ??? ??? ee.printStackTrace();
??? ??? }
??? }
??? private void timer_action(ActionEvent e) {
??? ??? try {
??? ??? ??? int i = bar.getValue();
??? ??? ??? if (i < 100) {
??? ??? ??? ??? i++;
??? ??? ??? ??? bar.setValue(i);
??? ??? ??? ??? lab.setText(bar.getValue() + "%");
??? ??? ??? }else
??? ??? ??? {
??? ??? ??? ??? timer.stop();
??? ??? ??? }
??? ??? } catch (Exception ee) {
??? ??? ??? ee.printStackTrace();
??? ??? }
??? }
??? public static void main(String[] args) {
??? ??? new ProgressBarTest().setVisible(true);
??? }
}
