application1.java

JAVA程序设计与实践.rar

/*
 *文件名:Application1.java
 *说  明:calculator包的入口类
 */
//打包到calculator
package calculator;

import javax.swing.UIManager;
import java.awt.*;

public class Application1 {
  boolean packFrame = false;

  //构造方法
  public Application1() {
    calculatorFrame frame = new calculatorFrame();
    if (packFrame) {
      frame.pack();
    }
    else {
      frame.validate();
    }
    //使窗口居中显示
    Dimension screenSize = Toolkit.getDefaultToolkit().getScreenSize();
    Dimension frameSize = frame.getSize();
    if (frameSize.height > screenSize.height) {
      frameSize.height = screenSize.height;
    }
    if (frameSize.width > screenSize.width) {
      frameSize.width = screenSize.width;
    }
    frame.setLocation((screenSize.width - frameSize.width) / 2, (screenSize.height - frameSize.height) / 2);
    frame.setVisible(true);
  }
  //入口方法
  public static void main(String[] args) {
    try {
      // 选择默认的LookAndFeel
      UIManager.setLookAndFeel(UIManager.getSystemLookAndFeelClassName());
    }
    catch(Exception e) {
      e.printStackTrace();
    }
    new Application1();
  }
}