applicationproxy.java

java实现的版画图程序

package drawfigure;

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

public class ApplicationProxy{
  Application app;
  Login login;
  boolean started=false;
  public void startApplication(){
    if(started){
    	if(login!=null){
    	  login.setVisible(false);
    	  login.dispose();
    	  System.out.println("Login has disposed.");
    	}else{
    	  System.out.println("Login is null...");
    	}
    }else{
      login=new Login();
      //系统在另外一个线程被加载
      synchronized(this){
	      	SwingUtilities.invokeLater(new Runnable(){
	      	public void run(){
	      		try{	      		       		 
	      		  Thread.currentThread().sleep(5000);	      		
		      	  new Application();
		      	  started=true;
		      	  startApplication();
	      	    }catch(InterruptedException ex){
	      	      ex.printStackTrace();
	      	    }
	      	} 
	      });
      }//end synchronized
    }
  }
  
  class Login extends JWindow{
    private JLabel messageLabel=new JLabel("正在启动...");
    public Login(){
      setSize(200,50);
      getContentPane().add(messageLabel,BorderLayout.CENTER);
      init();
    }
    public void init(){
    	Dimension screenSize = Toolkit.getDefaultToolkit().getScreenSize();
	    Dimension frameSize = this.getSize();
	    if (frameSize.height > screenSize.height) {
	      frameSize.height = screenSize.height;
	    }
	    if (frameSize.width > screenSize.width) {
	      frameSize.width = screenSize.width;
	    }
	    this.setLocation((screenSize.width - frameSize.width) / 2, (screenSize.height - frameSize.height) / 2);
	    this.setVisible(true);
    }
  }
}