java200选择题已做.docVIP

一. 选择题（234） 1.下面中哪两个可以在A的子类中使用：（ A,C） class A { protected int method1 (int a, int b) { return 0; } } A. public int method 1 (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; } 2.Abstract method cannot be static. True or False ? (A) A .True B.False 3.What will be the output when you compile and execute the following program. class Base { void test() { System.out.println(Base.test()); } } public class Child extends Base { void test() { System.out.println(Child.test()); } static public void main(String[] a) { Child anObj = new Child(); Base baseObj = (Base)anObj; baseObj.test(); } } Select most appropriate answer. A A. Child.test() Base.test() B. Base.test() Child.test() C. Base.test() D. Child.test() 4.What will be the output when you compile and execute the following program. class Base { static void test() { System.out.println(Base.test()); } } public class Child extends Base { void test() { System.out.println(Child.test()); Base.test(); //Call the parent method } static public void main(String[] a) { new Child().test(); } } Select most appropriate answer. C A. Child.test() Base.test() B. Child.test() Child.test() C. Compilation error. Cannot override a static method by an instance method D. Runtime error. Cannot override a static method by an instance method What will be the output when you compile and execute the following program. public class Base{ private void test() { System.out.println(6 + 6 + (Result)); } static public void main(String[] a) { new Base().test(); } } Select most appropriate answer. B A. 66(Result) B. 12(Result) C. Runtime Error.Incompatible type for +. Cant convert an int to a string. D. C