Java反射调用类的私有方法和内部类的私有方法

1.调用外部类的私有方法及获取属性值:

package org.example;
import java.lang.reflect.InvocationTargetException;
import java.lang.reflect.Method;
public class checkfeflect {
    public static void main(String[] args) throws ClassNotFoundException, NoSuchMethodException, IllegalAccessException, InvocationTargetException, InstantiationException, NoSuchFieldException {
        Class a = Class.forName("org.example.People");
        Object b = a.newInstance();
        Method c = a.getDeclaredMethod("man",String.class);
        c.setAccessible(true);
        System.out.println(c);
        System.out.println(c.invoke(b,"11"));
//       获取公有类的私有属性值
    }
}
class People{
    private String man (String b){
        return b;
    }
}

输出结果;

private java.lang.String org.example.People.man(java.lang.String)
11

1.调用内部类的私有方法及获取属性值:

package org.example;
import java.lang.reflect.Constructor;
import java.lang.reflect.InvocationTargetException;
import java.lang.reflect.Method;
public class checkfeflect {
    public static void main(String[] args) throws ClassNotFoundException, NoSuchMethodException, IllegalAccessException, InvocationTargetException, InstantiationException, NoSuchFieldException {
        Class p = Class.forName("org.example.People");
//        获取JAVA私有内部类反射类型
//        Class.forName(“外部类完整路径$内部私有类类名”);
        Class a = Class.forName("org.example.People$women");
//        获取构造方法
        Constructor constructor = a.getDeclaredConstructors()[0];
//        getDeclaredConstructors()[0]:是获取当前类和父类的所有方法
        constructor.setAccessible(true);
//         创建内部类的实例,需要先创建外部类的实例这里的实例是p
        Object f = constructor.newInstance(p.newInstance());
        Method g = f.getClass().getDeclaredMethod("get",String.class);
        g.setAccessible(true);
        System.out.println(g);
        System.out.println(g.invoke(f,"22"));
    }
}

输出结果:

private java.lang.String org.example.People$women.get(java.lang.String)
22