Question

class A { public int a = 100; } // End of class A
class B extends A { public int a = 80; } // End of class B
class C extends B { public int a = 60; } // End of class C
class D extends C { public int a = 40; } // End of class D

class E extends D{
    public int a =10;

    public void show(){
        int a =0; 
        // Write Java statements to display the values of
        // all a’s used in this file on System.out
    } // End of show() Method
}// End of class E

我正在尝试从E访问超类A，B，C的变量a，但我不知道该怎么做。我尝试过这样的事情

System.out.println(super.a+" "+super.super.a+" "+super.super.super.a+" "+
                   super.super.super.super.a);

Answer 1

由于A，B，C，D是E的超类，我们可以将E强制转换为超类型并访问该字段。

System.out.println(((A) this).a); //Prints 100
System.out.println(((B) this).a); //Prints 80
System.out.println(((C) this).a); //Prints 60
System.out.println(((D) this).a); //Prints 40

多级继承，尝试访问超类

1 个答案: