package xFTest;

public class TestSingleton {  
	
        private TestSingleton() {  
    }  
  
    private static volatile TestSingleton instance = null;  
  
    public static TestSingleton getInstance() {  
           if (instance == null) {    
               instance = new TestSingleton();   
           }   
           return instance;  
    }  
  
   
  

	public void printInfo() { 
		 int X = 0;
		 int Y = 1;
		 X = X^Y;
		 Y = Y^X;
		 X = X^Y;
		 System.out.println("您要的值为X="+X+"----Y="+Y); 
    }  
  
}