trainapp.java

JAVA数据库编程实例随书源码 JAVA数据库编程实例随书源码

package train_table;

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

public class trainApp {
  private boolean packFrame = false;   //是否显示Frame
  public trainApp() {                  //trainApp的构造函数
  admin_frm frame = new admin_frm();     //将admin_frm实例化

    if (packFrame) {
      frame.pack();
    }
    else {
      frame.validate();
    }

    Dimension screenSize = Toolkit.getDefaultToolkit().getScreenSize();//获得屏幕尺寸
    Dimension frameSize = frame.getSize();              //获得frame尺寸
    if (frameSize.height > screenSize.height) {         //frame最大高度不超过屏幕
      frameSize.height = screenSize.height;
    }
    if (frameSize.width > screenSize.width) {           //frame最大宽度不超过屏幕
      frameSize.width = screenSize.width;
    }
    //获得frame显示位置
    frame.setLocation((screenSize.width - frameSize.width) / 2, (screenSize.height - frameSize.height) / 2);
    frame.setVisible(true);      //显示frame
  }
      //程序入口，即主方法
  public static void main(String[] args) {
    try {
      UIManager.setLookAndFeel(UIManager.getSystemLookAndFeelClassName());
    }
    catch(Exception e) {
      e.printStackTrace();
    }
    new trainApp();
  }
}