usehelloframe.java

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package hello;

import java.awt.Dimension;
import java.awt.Toolkit;
//引入C1项目的HelloFrame类
import hello.HelloFrame;

public class UseHelloFrame {
    
    public static void main(String[] args) {
        HelloFrame frame = new HelloFrame();
        //取得屏幕大小    
        Dimension screenSize = Toolkit.getDefaultToolkit().getScreenSize();
        //取得窗口大小    
        Dimension frameSize = frame.getSize();
        //使窗口居中对齐
        frame.setLocation( (screenSize.width - frameSize.width) / 2,
                          (screenSize.height - frameSize.height) / 2);
        frame.setVisible(true);
    }
}