Java |类和对象|问题4

class demo
{
    int a, b;
      
    demo()
    {
        a = 10;
        b = 20;
    }
      
    public void print()
    {
        System.out.println ("a = " + a + " b = " + b + "\n");
    }
}
  
class Test
{
  
    public static void main(String[] args)
    {
        demo obj1 = new demo();
        demo obj2 = obj1;
  
        obj1.a += 1;
        obj1.b += 1;
  
        System.out.println ("values of obj1 : ");
        obj1.print();
        System.out.println ("values of obj2 : ");
        obj2.print();
  
    }
}

(一)编译错误
(B)

values of obj1: 
a = 11 b = 21
values of obj2: 
a = 11 b = 21

(C)

values of obj1: 
a = 11 b = 21
values of obj2: 
a = 10 b = 20

(D)

values of obj1: 
a = 11 b = 20
values of obj2: 
a = 10 b = 21

(E)运行时错误答案： (B)
说明：将obj2分配给obj1会使obj2成为对obj1的引用。因此，obj1中的任何更改也将反映在obj2中。
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