  public class Student
     {
       String name;
       String getName()
       {
          return name;
       }
       void setName(String str)
       {
          name = str;         
       }       
       public static void main(String[] args)
       {
           Student str1,str2;                    //
           //System.out.println(str1);             //δʼ           
           str1 = new Student();                //󣬲ֵ
           str1.setName("С");               //ͨ޸Ķʵ
           str2 = str1;                        //ʵ帳ֵһ
           System.out.println("ѧ "+str1.getName());  
           System.out.println("ѧ "+str2.getName()); 
           //ͨøıʵ
           str2.setName("Сǿ");
           System.out.println("ѧ "+str1.getName());  
           System.out.println("ѧ "+str2.getName()); 
           //ֱʹöʵ
           System.out.println(new Student().getName());   
       }
     }
