Discussion
Which line contains the error?
public class Sample54
{
public static void main(String[] args)
{
assert -0.0 == 0.0;
assert Double.valueOf(-0.0).equals(Double.valueOf(0.0));
System.out.println("both");
}
}
Answer: B
The primitive comparison is true: == treats negative and positive zero as equal. Double.equals does not, because it compares the underlying bit patterns so that collections behave consistently. So the first assertion passes and the second fails, on values that look identical.
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