java反射调用私有方法和修改私有属性

//调用私有方法
package com.java.test;

public class PrivateMethod
{

	private String sayHello(String name)
	{
		return "hello "+name;
	}
}

测试：

package com.java.test;

import java.lang.reflect.Method;

public class PrivateMethodTest
{

	public static void main(String[] args)throws Exception
	{
		PrivateMethod  p = new PrivateMethod();

		Class<?> classType = p.getClass();

		Method method = classType.getDeclaredMethod("sayHello", new Class[]{String.class});

		method.setAccessible(true);//压制java的检查机制

		String str = (String)method.invoke(p, new Object[]{"lzyer"});

		System.out.println(str);
	}
}

修改私有属性：

package com.java.test;

public class PrivateField
{

	private String name="zhangsan";

	public String getName()
	{

		return this.name;
	}
}

测试：

package com.java.test;

import java.lang.reflect.Field;

public class PrivateFieldTest
{

	public static void main(String[] args)throws Exception
	{
		PrivateField p = new PrivateField();

		Class<?> clazz = p.getClass();

		Field field = clazz.getDeclaredField("name");

		field.setAccessible(true);//压制java检查机制

		field.set(p, "lisi");

		System.out.println(p.getName());
	}
}