反射1：给定类，构造一个对象

太过爱你忘了你带给我的痛 2022-08-09 01:51 131阅读 0赞

package cn.itcast.jdbc;
    
    import java.lang.reflect.Constructor;
    
    import cn.itcast.domain.User;
    
    public class ReflectTest { 
    
        public static void main(String[] args) throws Exception {
            User user=(User)create(User.class);
            System.out.println(user);
        }
    
        //给定一个类，构造出一个对象。
        static Object create(Class clazz) throws Exception{
            Constructor con = clazz.getConstructor(String.class);       //找到构造器
            Object obj=con.newInstance("test name");    //构造出对象
            return obj;
        }
    }

使用反射代码可读性很差，但是会很灵活

User.java

package cn.itcast.domain;
    
    import java.util.Date;
    
    public class User { 
    
        private int id;
        private String name;
        private Date birthday;
        private float money;
    
        public User() {
    
        }
    
        public User(String name) {
            this.name = name;
        }
    
        public User(float money) {
            this.money = money;
        }
    
        @Override
        public String toString() {
            return "id=" + this.id + " name=" + this.name + " birthday="
                    + this.birthday + " money=" + this.money;
        }
    
        public int getId() {
            return id;
        }
    
        public void setId(int id) {
            this.id = id;
        }
    
        public String getName() {
            return name;
        }
    
        public void setName(String name) {
            this.name = name;
        }
    
        public Date getBirthday() {
            return birthday;
        }
    
        public void setBirthday(Date birthday) {
            this.birthday = birthday;
        }
    
        public float getMoney() {
            return money;
        }
    
        public void setMoney(float money) {
            this.money = money;
        }
    
    }