hellorevisited.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.*;

/** This program adds a Hello World message to a filled green
 *  oval in the center of a JFrame. 
 */
public class HelloRevisited {

	public static void main( String[] args )  {
		JFrame window = new JFrame("Hello World");
		window.setBounds(10, 10, 400, 400);
		window.setVisible(true);
		window.setLayout(null);
		Oval dot = new Oval(100, 100, 200, 200);
		dot.setBackground(Color.green);
		dot.repaint();
     	window.add(dot, 0);
		Label helloMsg = new Label("Hello World!");
		helloMsg.setBounds(20, 85, 160, 30);
		helloMsg.setAlignment(Label.CENTER);
		helloMsg.repaint();
		dot.add(helloMsg, 0);
		window.repaint();
	}
}