在Java中调用私有方法时除了在调用之前需要设置setAccessible(true)之前，还需要注意getMethod和getDeclaredMethod
调用实例：
package com.jason.test; //测试类 class MyTest { private void testCall() { System.out.println("test"); } }
TestReflect.java
package com.jason.test; import java.lang.reflect.Method; public class TestReflect { public static void main(String[] args) { try { Class<?> classInstance = Class.forName("com.jason.test.MyTest"); // Method method = classInstance.getMethod("testCall"); Method method = classInstance.getDeclaredMethod("testCall"); method.setAccessible(true); method.invoke(classInstance.newInstance()); } catch (Exception e) { // TODO Auto-generated catch block e.printStackTrace(); } } } 在调用私有方法时 必须用getDeclaredMethod，getDeclaredMethod和getMethod区别如下：getMethod：Returns a object that reflects the specified public member method of the class or interface represented by this object.（只能获取public的方法）
getDeclaredMethod：Returns a object that reflects the specified declared method of the class or interface represented by this object. （能获取类中所有方法）
