centerframe.java

来自「此源码为机械工业出版社出版的《Java语言程序设计》第三版所配套的书中所有源代码」· Java 代码 · 共 30 行

// CenterFrame.java: Display a frame
import javax.swing.*;
import java.awt.*;

public class CenterFrame
{
  public static void main(String[] args)
  {
    JFrame frame = new JFrame("Centered Frame");
    frame.setSize(400, 300);

    // New in JDK 1.3 to exit the program upon closing
    frame.setDefaultCloseOperation
      (JFrame.EXIT_ON_CLOSE);

    // Get the dimension of the screen
    Dimension screenSize = Toolkit.getDefaultToolkit().getScreenSize();
    int screenWidth = screenSize.width;
    int screenHeight = screenSize.height;

    // Get the dimension of the frame
    Dimension frameSize = frame.getSize();
    int x = (screenWidth - frameSize.width)/2;
    int y = (screenHeight - frameSize.height)/2;

    frame.setLocation(x, y);
    frame.setVisible(true);
  }
}