java对象拷贝

骑猪看日落 2023-06-27 05:42 3阅读 0赞

对于属性名一样的对象，把对象A的属性值拷贝给对象B

public static void main(String[] args) throws ParseException {
             demo1 d=new demo1();
             d.setName("zy");
             d.setAge(20);
             d.setMsg("zy");
             demo2 d2=new demo2();
    
             System.out.println("拷贝前：");
             System.out.println(d.toString());
             System.out.println(d2.toString());
             change(d,d2);
             System.out.println("拷贝后：");
             System.out.println(d.toString());
             System.out.println(d2.toString());
    	 }
    
         /**
          * 对象1的属性值拷贝给对象2
          * @param o1
          * @param o2
          */
    	 public static void change(Object o1,Object o2){
             try {
                 Class<?> o1Class = o1.getClass();
                 Class<?> o2Class = o2.getClass();
                 Field[] o1f = o1Class.getDeclaredFields();
                 Field[] o2f = o2Class.getDeclaredFields();
    
                 for (int i = 0; i < o1f.length; i++) {
                     String o1name = o1f[i].getName();
                     for (int j = 0; j < o2f.length; j++) {
                         String o2name = o2f[j].getName();
                         if(o1name.equals(o2name)){
                             o2f[j].setAccessible(true);
                             o2f[j].set(o2,o1f[i].get(o1));
                         }
                     }
                 }
             } catch (Exception e) {
                 e.printStackTrace();
             }
         }
    
    }
    
    @Data
    class demo1{
        String name;
        Integer age;
        String msg;
    }
    @Data
    class demo2{
        String name;
        Integer age;
        String msg2;
    }

![watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3FxXzM5NjQ4MDI5_size_16_color_FFFFFF_t_70][]

只有name和age字段名字一样，才拷贝。最基础的demo,还未做类型判断

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