driver.java

Java程序设计(美) David D. Riley著 机械工业出版社 书籍配套 代码

import javax.swing.JFrame;
import java.awt.TextArea;

/** powerOfTwo Program (Figure 10.5)
 *  Author: David Riley
 *  Date: January, 2005
 */
public class Driver  {
	private JFrame window;
	private TextArea outPane;

	/**	post:	A window is created containing a text area
	 *			and the text area contains the powers of 2 less than 100 
	 */
	public Driver()   {
		int  powerOfTwo;
		window = new JFrame("Powers of 2"); 
		window.setBounds(10, 10, 200, 140);
		window.setVisible(true);
		window.setLayout(null);
		outPane = new TextArea();
		outPane.setBounds(20, 20, 150, 80);
		window.add(outPane, 0);
		powerOfTwo = 2;
		while ( powerOfTwo < 100 )   {
			outPane.append("Next power: " + powerOfTwo + "\n");
			powerOfTwo = powerOfTwo * 2;
		}
		window.repaint();
	}
}