java反射机制入门01

package com.rainmer.bean;

public class Book {
    private int id;
    protected String name;
    public String type;
    public int getId() {
        return id;
    }
    public void setId(int id) {
        this.id = id;
    }
    public String getName() {
        System.out.println("调用了getName方法");
        return name;
    }
    public void setName(String name) {
        System.out.println("调用了setName方法");
        this.name = name;
    }
    public String getType() {
        return type;
    }
    public void setType(String type) {
        this.type = type;
    }
    
    public void test(String name, int a){
        System.out.println("调用了多参数的方法");
    }
}

package com.rainmer.main;

import com.rainmer.bean.Book;

public class Test1 {
    public static void main(String[] args) {
        Class demo1 = null;
        Class demo2 = null;
        Class demo3 = null;
        
        //创建类对象的3种方式
        //第一种方式
        try {
            demo1 = Class.forName("com.rainmer.bean.Book");
        } catch (Exception e) {
            e.printStackTrace();
        }
        System.out.println(demo1);
        
        //第二种方式
        Book bo = new Book();
        Object ob = bo;
        System.out.println(ob.getClass());
        System.out.println(bo.getClass());
        
        //第三种方式
        demo3 = Book.class;
        System.out.println(demo3);
        
        //实例化类对象
        try {
            Book bo1 = (Book) demo1.newInstance();//newInstance方法默认返回Object对象
            System.out.println(bo1);//@后面的是分配的内存地址
        } catch (InstantiationException | IllegalAccessException e) {
            // TODO Auto-generated catch block
            e.printStackTrace();
        }
    }
}