不用构造器实例化一个对象
package com.example.demo.controller;
import sun.reflect.ReflectionFactory;
import java.lang.reflect.Constructor;
public class Test {
private String id;
private String name;
private Test() {
System.out.println("test 1");
}
private Test(String id, String name) {
this.id = id;
this.name = name;
System.out.println("test 2");
}
public static void main(String[] args) throws Exception {
ReflectionFactory reflectionFactory = ReflectionFactory.getReflectionFactory();
Constructor<?> constructor = reflectionFactory.newConstructorForSerialization(Test.class, Object.class.getDeclaredConstructor());
constructor.setAccessible(true);
Object instance = constructor.newInstance();
System.out.println(instance.getClass().getName());
}
}
运行结果
com.example.demo.controller.Test
可以看到并没有输出 “test 1” or “test 2”，说明其并不是通过构造器创建的对象。 实现原理暂时不清楚
