calc.java~11~

JAVA做的计算器 十分和WINDOWS自带的相似

package calc;

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

public class Calc {
  boolean packFrame = false;

  /*java默认风格
*************/
private static String Metal =
"javax.swing.plaf.metal.MetalLookAndFeel";

/*motif风格
**********/
private static String Motif =
"com.sun.java.swing.plaf.motif.MotifLookAndFeel";

/*Windows风格
**************/
private static String Windows =
"com.sun.java.swing.plaf.windows.WindowsLookAndFeel";

/*Borland风格
  **************/
private static String Borland =
  "com.borland.plaf.borland.BorlandLookAndFeel";


/*当前系统风格
****************/
//UIManager.getSystemLookAndFeelClassName()

  //Construct the application
  public Calc() {
    MFrame frame = new MFrame();
    //Validate frames that have preset sizes
    //Pack frames that have useful preferred size info, e.g. from their layout
    if (packFrame) {
      frame.pack();
    }
    else {
      frame.validate();
    }
    //Center the window
    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);
  }


  public static void main(String[] args) {
    try {
      UIManager.setLookAndFeel(Motif);
    }
    catch(Exception e) {
      e.printStackTrace();
    }
    new Calc();
  }
}