progress.java

这是一个java程序

//GUI-Swing组件：演示进度条的使用。
import java.awt.*;
import java.awt.event.*;
import javax.swing.*;
import javax.swing.event.*;
public class Progress extends JFrame{
	private JProgressBar bar;
	private JButton but;
	private Container c;
	private JLabel labe;
	public Progress(){
		super("进度条演示");
		c=getContentPane();
		c.setLayout(new FlowLayout());
		bar=new JProgressBar();
		but=new JButton("执行演示");
		c.add(but);
		bar.setForeground(Color.blue);
		c.add(bar);
		labe=new JLabel();
		c.add(labe);
		but.addActionListener( new ActionListener(){
			public void actionPerformed(ActionEvent e){
				if(bar.getValue()!=bar.getMaximum())
					bar.setValue(bar.getValue()+10);
				else
					bar.setValue(bar.getMinimum());
			}
		});
		bar.addChangeListener(new ChangeListener(){
			public void stateChanged(ChangeEvent e){
				labe.setText("Progressbar mininum:"+bar.getMinimum()+"Maxnum"+bar.getMaximum()+bar.getValue());
			}
		});
		setSize(350,150);
		show();
	}
	public static void main(String args[]){
		Progress app=new Progress();
		app.addWindowListener(new WindowAdapter(){
			public void windowClosing(WindowEvent e){
				System.exit(0);
			}
		}
		);
	}
	
}