java.lang.String类运算符重载

Given:

What is the output?

A

B

C

D

E Compilation fails

F An exception is thrown at runtime

Answer: D

解析本题主要考察String类的+运算符使用String在java中定义时修饰符为final且对+运算符进行了重载+操作相当于字符串的连接