@Test public void isNullOrEmpty_ShouldReturnTrueIfEmpty() { boolean result = StringUtil.isNullOrEmpty(""); assertTrue(result); }
public static boolean isNullOrEmpty(@Nullable String s) { return s == null || s.trim().length() == 0; }
StringUtil { public static boolean isNullOrEmpty(@Nullable String s) { return s == null || s.trim().length() == 0; } }
StringUtil { public static boolean isNullOrEmpty(@Nullable String s) { return s == null || s.trim().length() == 0; }  }
StringUtil { public static boolean isNullOrEmpty(@Nullable String s) { return s == null || s.trim().length() == 0; }  static boolean isNullOrEmpty(@Nullable String s); @NonNull static String controlToSpace(@Nullable String val); static boolean isValid(@Nullable String value); }
StringUtil { public static boolean isNullOrEmpty(@Nullable String s) { return s == null || s.trim().length() == 0; }  static boolean isNullOrEmpty(@Nullable String s); @NonNull static String controlToSpace(@Nullable String val); static boolean isValid(@Nullable String value); static final char SPACE_CHAR; }