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;
}
}

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);
}
}

package com.java.test;

public class PrivateField
{

private String name="zhangsan";

public String getName()
{

return this.name;
}
}

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());
}
}