수다닷컴

3.
which statement is true?
A.Assertion can be enabled or disabled on a class-by-class basis.
B.Conditional compilation is used to allow tested classes to run at full speed.
C.Assertion are appropriate for checking the validity of arguments in a method.
D.The programmer can choose to execute a return statement or to throw an

exception if an assertion fails.
정답A 라는데 저게 무슨 뜻인가요.
4.

public class Test{
public void foo(){
assert false;
assert false;
}
public void bar(){
which(true){
assert true;
}
assert false; /////
}
이 주석 부분에서 에러가 난데요..당췌 이해가 안가네요.

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