Java反射访问私有成员

 field.setAccessible(true);

 

import java.lang.reflect.*;

public class Main
{
    class Test
    {
        private int id = 5;

    }

    public static void main(String[] args) throws SecurityException, NoSuchFieldException, IllegalArgumentException, IllegalAccessException, InstantiationException
    {

        Field field = Test.class.getDeclaredField("id");
        field.setAccessible(true);//suppress Java language access checking

        Main m = new Main();
        Test obj = m.new Test();
        int id = field.getInt(obj);

        System.out.println(id);
    }
}