Java 进度条 JProgressBar 简单

《Java 进度条 JProgressBar 简单》由会员上传分享，免费在线阅读，更多相关内容在教育资源-天天文库。

1、考虑在某个应用中使用JProgressBar进行文件下载进度的描述，先用一个小程序测试一下该控件的效果。 将上图所示的代码记录如下：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 java.ut

2、il.logging.Level;import java.util.logging.Logger; 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.UIManager;import javax.s

3、wing.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()

4、{       frame = new JFrame("进度条简单示例");       frame.setBounds(100,100,400,130);       frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);       frame.setResizable(false);       ContainercontentPanel= frame.getContentPane();       label = new JLabel("点击运行

5、按钮开始",JLabel.CENTER);       progressbar = new JProgressBar();       progressbar.setOrientation(JProgressBar.HORIZONTAL);       progressbar.setMinimum(0);       progressbar.setMaximum(100);       progressbar.setValue(0);       progressbar.setStringPainted(

6、true);       progressbar.addChangeListener(this);       progressbar.setPreferredSize(new Dimension(300,20));       progressbar.setBorderPainted(true);       progressbar.setBackground(Color.pink);        JPanelpanel= new JPanel();       b = new JButton("运行

7、");       b.setForeground(Color.blue);       b.addActionListener(this);       panel.add(b);       timer = new Timer(100, this);       contentPanel.add(panel,BorderLayout.NORTH);       contentPanel.add(label,BorderLayout.CENTER);       contentPanel.add(pro

8、gressbar,BorderLayout.SOUTH);       //frame.pack();       frame.setVisible(true);    }     public void actionPerformed(ActionEvente){       if (e.getSource()== b){           timer.start();       }       if (e.getSou