wbuser.java

java网络编程 包含全书所有代码编程以及实例

package whiteboard;

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

public class WBUser {
  boolean packFrame = false;

  //Construct the application
  public WBUser() {
    WBFrame frame = new WBFrame();
    //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);
    boolean flag = true;
    while (flag)
    {
      flag = frame.waitforpackets();             //一直监听端口以接收组播组传来的信息
    }
  }
  //Main method
  public static void main(String[] args) {
    try {
      UIManager.setLookAndFeel(UIManager.getSystemLookAndFeelClassName());
    }
    catch(Exception e) {
      e.printStackTrace();
    }
    new WBUser();
  }
}