java面试题

sun201200204

　　1. class A {　　2. protected int method1(int a, int b) { return 0; }　　3. }　　Which two are valid in a class that extends class A? (Choose two)　　A. public int method1(int a, int b) { return 0; }　　B. private int method1(int a, int b) { return 0; }　　C. private int method1(int a, long b) { return 0; }　　D. public short method1(int a, int b) { return 0; }　　E. static protected int method1(int a, int b) { return 0; } 答案：A,C
B：Cannot reduce the visibility of the inherited method from A
D：Multiple markers at this line
    - The return type is incompatible with
     A.method1(int, int)
E：This static method cannot hide the instance method from A