Java 反射获取构造方法并使用,练习

反射获取构造方法并使用

package com.reflection;

import java.lang.reflect.Constructor;


public class Ref3 {
    public static void main(String[] args) {
        try {
            Class c = Class.forName("com.stream.Student9");
            Constructor con = c.getConstructor(String.class,int.class,String.class);
            Object o = con.newInstance("徐凤年",22,"北凉");
            System.out.println(o);
        } catch (Exception e) {
            e.printStackTrace();
        }
    }
    
}

package com.reflection;

import java.lang.reflect.Constructor;


public class Ref4 {
    public static void main(String[] args) {
        try{
            Class c = Class.forName("com.stream.Student9");
            Constructor cons = c.getDeclaredConstructor(String.class);
            cons.setAccessible(true);
            Object o = cons.newInstance("徐凤年");
            System.out.println(o);
        }catch (Exception e){
           e.printStackTrace();
        }
    }
    
}