多选题 Given the proper import statement(s) and:
4. Console c = System. console();
5. char[] pw;
6. if(c == null) return;
7. pw = c.readPassword("%s", "pw: ");
8. System.out.println(c.readLine("%s", "input: "));
Which statements are true? (Choose all that apply.)

A、 An exception will be thrown on line 8.
B、 The variable pw must be a String, not a char[].
C、 No import statements are necessary for the code to compile.
D、 If the code compiles and is invoked, line 7 might never run.
E、 Without a third argument, the readPassword() method will echo the password the user types.
F、 If line 4 was replaced with the following code, the program would still compile: "Console c = new Console();".

【正确答案】 D

【答案解析】