SCJP題庫第157題

Given that c is a reference to a valid java.io.Console object, and:

11. String pw = c.readPassword("%s", "pw: ");

12. System.out.println("got " + pw);

13. String name = c.readLine("%s", "name: ");

14. System.out.println(" got", name);

If the user types fido when prompted

for a password, and then responds

bob when prompted for a name,

what is the result?

A. pw:

got fido

name: bob

got bob

B. pw: fido

got fido

name: bob

got bob

C. pw:

got fido

name: bob got bob

D. pw: fido

got lido

name: bob got bob

E. Compilation fails.

F. An exception is thrown at runtime.

 

Ans: E

 

解說:

此程式片段有二個錯誤

String pw = c.readPassword(“%s”, “pw: ”); 改：

char[] pw = c.readPassword("%s", "pw: ");

System.out.println(“ got”, name); 改 System.out.println(" got“ + name);