【通过反射获取私有构造方法并使用】

package com.yjf.esupplier.common.test;


import java.lang.reflect.Constructor;

/**
 * @author shusheng
 * @description 通过反射获取私有构造方法并使用
 * @Email shusheng@yiji.com
 * @date 2019/1/5 16:30
 */
public class ReflectDemo1 {

    public static void main(String[] args) throws Exception {

        // 获取字节码文件对象
        Class c = Class.forName("com.yjf.esupplier.common.test.Person");

        Constructor con = c.getDeclaredConstructor(String.class);
        //暴力访问,值为true则指示反射的对象在使用时应该取消Java语言访问检查
        con.setAccessible(true);
        Object obj = con.newInstance("张三");

        System.out.println(obj);
    }

}

package com.yjf.esupplier.common.test;

/**
 * @author shusheng
 * @description
 * @Email shusheng@yiji.com
 * @date 2018/12/29 13:42
 */
public class Person {

        private String name;
        int age;
        public String address;

        public Person() {
        }

        private Person(String name) {
            this.name = name;
        }

        Person(String name, int age) {
            this.name = name;
            this.age = age;
        }

        public Person(String name, int age, String address) {
            this.name = name;
            this.age = age;
            this.address = address;
        }

        public void show() {
            System.out.println("show方法的输出");
        }

        public void method(String s) {
            System.out.println("method方法的输出： " + s);
        }

        public String getString(String s, int i) {
            return s + "---" + i;
        }

        private void function() {
            System.out.println("function方法的输出");
        }

        @Override
        public String toString() {
            return "Person [name=" + name + ", age=" + age + ", address="
                    + address
                    + "]";
        }

}