Nullpointer exception

Question

There is a possiblity that this may be a dupicate question. I initialize a String variable to null.I may or may not update it with a value.Now I want to check whether this v

Answer 1

String is immutable

@Test(expected = NullPointerException.class)
public void testStringEqualsNull() {
    String s = null;
    s.equals(null);
}

@Test
public void testStringEqualsNull2() {
    String s = null;
    TestCase.assertTrue(s == null);
}