1.
Given:
1. public class returnIt {
2. returnType methodA(byte x, double y){
3. return (short) x/y * 2;
4. }
5. }
What is the valid returnType for methodA in line 2?
A. int
B. byte
C. long
D. short
E. float
F. double
Answer F
注释:short 类型的 x，除以 double 类型的 y，再乘 int 的 2，所以结果是 double 类型的。
注意第三行的强制转换，只是转换了 x。
2.
1) class Super{
2) public float getNum(){return 3.0f;}
3) }
4)
5) public class Sub extends Super{
6)
7) }
which method, placed at line 6, will cause a compiler error?
A. public float getNum(){return 4.0f;}
B. public void getNum(){}
C. public void getNum(double d){}
D. public double getNum(float d){return 4.0d;}
