bitoperation.java

提供了常用的JAVA技术的示例

package bitoperation;

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

/**
 * <p>Title: </p>
 * <p>Description: </p>
 * <p>Copyright: Copyright (c) 2002</p>
 * <p>Company: </p>
 * @author unascribed
 * @version 1.0
 */

public class bitoperation {
  static final int FLAG1=1;
  static final int FLAG2=2;
  static final int FLAG3=4;
  static final int FLAG4=8;
  static final int FLAG5=16;

  boolean packFrame = false;

  //Construct the application
  public bitoperation() {
    Frame1 frame = new Frame1();
    //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);
  }
  //Main method
  public static void main(String[] args) {
    int flags=0;
    int flag1=flags &FLAG1;
    int flag2=(flags&FLAG2)>>>1;
    int flag3=(flags&FLAG3)>>>2;
    int flag4=(flags&FLAG4)>>>3;
    int flag5=(flags&FLAG5)>>>4;
    System.out.println("clear falg1...flag5 :");
    System.out.println("flag1="+flag1);
    System.out.println("flag2="+flag2);
    System.out.println("flag3="+flag3);
    System.out.println("flag4="+flag4);
    System.out.println("flag5="+flag5);
    System.out.println("Clear flags... flags="+flag5+flag4+flag3+flag2+flag1);
    flags=flags|FLAG1;
    flag1=flags&FLAG1;
    System.out.println("flag1="+flag1);
    System.out.println("set flag1...flags="+flag5+flag4+flag3+flag2+flag1);
    flags=flags^FLAG2;
    flag2=flags>>>1&1;
    System.out.println("flag2="+flag2);
    System.out.println("set flag2...flags="+flag5+flag4+flag3+flag2+flag1);
    flags=flags|FLAG3;
    flag3=flags>>>2&1;
    System.out.println("flag3="+flag3);
    System.out.println("set flag3...flags="+flag5+flag4+flag3+flag2+flag1);
    flags=~FLAG1&flag1;//clear flag1
    flag1=flags&FLAG1;
    System.out.println("clear flag1="+flag1);
    System.out.println("Clear flag1... flags="+flag5+flag4+flag3+flag2+flag1);
    flags=flags|FLAG4|FLAG5;
    flag4=flags>>>3&1;
    flag5=flags>>>4&1;
    System.out.println("set flag4 and flag5...flags="+flag5+flag4+flag3+flag2+flag1);
    flags=flags^FLAG5;
    flag5=flags>>>4;
    System.out.println("clear flag5...flags="+flag5+flag4+flag3+flag2+flag1);
    flag4=flags&1;
    System.out.println("clear flag4...flags="+flag5+flag4+flag3+flag2+flag1);
    try {
      UIManager.setLookAndFeel(UIManager.getSystemLookAndFeelClassName());
    }
    catch(Exception e) {
      e.printStackTrace();
    }
    new bitoperation();
  }
}