如何在变量类上调用静态方法？

public class Example {
    public static void main(String[] args) {
        // 调用静态方法
        int result = add(5, 3);
        System.out.println("结果是: " + result);
    }

    public static int add(int a, int b) {
        return a + b;
    }
}

public class Example {
    public static void main(String[] args) {
        // 使用类名调用静态方法
        int result1 = Example.add(5, 3);
        System.out.println("结果是: " + result1);

        // 通过变量类调用静态方法
        Class<Example> clazz = Example.class;
        int result2 = callStaticMethod(clazz, "add", 5, 3);
        System.out.println("结果是: " + result2);
    }

    public static int add(int a, int b) {
        return a + b;
    }

    public static int callStaticMethod(Class<?> clazz, String methodName, Object... args) {
        try {
            Method method = clazz.getDeclaredMethod(methodName, getParameterTypes(args));
            return (int) method.invoke(null, args);
        } catch (Exception e) {
            e.printStackTrace();
            return -1;
        }
    }

    private static Class<?>[] getParameterTypes(Object... args) {
        Class<?>[] parameterTypes = new Class<?>[args.length];
        for (int i = 0; i< args.length; i++) {
            parameterTypes[i] = args[i].getClass();
        }
        return parameterTypes;
    }
}