如何在没有powermock的情况下将私有方法存根

public class MyClass {
    private String privateMethod(String arg) {
        // 私有方法的实现
        return "Private method result: " + arg;
    }
}

public class TestClass {
    public static void main(String[] args) throws Exception {
        MyClass myObject = new MyClass();

        // 获取私有方法的Class对象
        Class<?> clazz = myObject.getClass();
        Method privateMethod = clazz.getDeclaredMethod("privateMethod", String.class);

        // 设置私有方法为可访问
        privateMethod.setAccessible(true);

        // 调用私有方法
        String result = (String) privateMethod.invoke(myObject, "input");

        System.out.println(result);
    }
}