Checking for a not null, not blank String in Java

Question

I am trying to check if a Java String is not null, not empty and not whitespace.

In my mind, this code should have been quite up for the job.

Answer 1

This simple code will do enough:

public static boolean isNullOrEmpty(String str) {
    return str == null || str.trim().equals("");
}

And the unit tests:

@Test
public void testIsNullOrEmpty() {
    assertEquals(true, AcdsUtils.isNullOrEmpty(""));
    assertEquals(true, AcdsUtils.isNullOrEmpty((String) null));
    assertEquals(false, AcdsUtils.isNullOrEmpty("lol    "));
    assertEquals(false, AcdsUtils.isNullOrEmpty("HallO"));
}