public static Class findClassByName(String className) {
        try {
            return Class.forName(className);
        } catch (Exception e) {
            throw new RuntimeException("this class name not found");
        }
    }
@Test
    void testFindClassByName() {
        Class clazz = ClassUtils.findClassByName("java.lang.Integer");
        assertEquals("java.lang.Integer", clazz.getName());
    }