exam6_4test.java

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class A1
{
    int x = 2;    
    public void setx(int i){    
       x = i;
    }
    void printa()
    {
       System.out.println(x);
    }  
}

class B1 extends A1
{
    int x=100;
    void printb() 
    {
        super.x = super.x +10 ;
        System.out.println
          ("super.x= " + super.x + 
                "  x= " + x);
    }  
}

public class Exam6_4Test 
{
    public static void main(String[] args)
    {
      A1 a1 = new A1();  
      a1.setx(4);   
      a1.printa();

      B1 b1 = new B1();     
      b1.printb();     
      b1.printa();  
  
      b1.setx(6);  // 将继承来的x值设置为6
      b1.printb();     
      b1.printa();
      a1.printa();
    }  
}