public static String getSimpleClassName(String qualifiedName) {
        if (null == qualifiedName) {
            return null;
        }
        int i = qualifiedName.lastIndexOf('.');
        return i < 0 ? qualifiedName : qualifiedName.substring(i + 1);
    }
@Test
    void testGetSimpleClassName() {
        Assertions.assertNull(ClassUtils.getSimpleClassName(null));
        Assertions.assertEquals("Map", ClassUtils.getSimpleClassName(Map.class.getName()));
        Assertions.assertEquals("Map", ClassUtils.getSimpleClassName(Map.class.getSimpleName()));
    }