在循环中创建对象的新实例以添加到列表中 [英] Creating new instance of object in loop to add in list

问题描述

我正在尝试将对象(JavaBean)添加到列表中.

I am trying to add the object (JavaBean) into the list.

     MyWebServiceRequest mywebService = new MyWebServiceRequest();
     MyRequestType type= new MyRequestType ();

       for(int i=0; i< 9; i++){
           type.setA(someDynamicValue);
           type.setB(someDynamicValue);
           mywebService.add(type);
       }

这只会创建一个(类型)对象，因此它会向同一对象添加9次具有相同数据的数据.

This creates only one object of (type), so it add same object 9 times with same data.

 MyWebServiceRequest mywebService = new MyWebServiceRequest();
   for(int i=0; i< 9; i++){
           MyRequestType type= new MyRequestType ();
           type.setA(someDynamicValue);
           type.setB(someDynamicValue);
           mywebService.add(type);
       }

这将创建多个对象，并使用diff值添加9个diff对象.

This creates multiple objects, add 9 diff object with diff values .

如果(for循环)每次创建一个请求时都创建数百个对象而不是9个，该怎么办?那么它在内存中的转储对吗?

What if (for loop) create hundreds of objects instead of 9 in single loop , each and every time a request is made? So its dump in memory right?

如何避免这种情况?

在此先感谢.

推荐答案

执行此操作

 MyWebServiceRequest mywebService = new MyWebServiceRequest();
   MyRequestType type= new MyRequestType ();

   for(int i=0; i< 9; i++){
       type.setA(1);
       type.setB(2);
       mywebService.add(type);
   }

mywebService.add(type); 行将对象添加到列表中，无论其状态是否更改或相同.因为它是列表，而不是不允许重复的地图.

The line mywebService.add(type); adds the object into list , no matter its state is changed or not or it is the same object. Because its a list and not a Map which do not allow duplicates.

现在，当您这样做时，计数就增加到10

So the count goes to 10 , now when you do

 MyWebServiceRequest mywebService = new MyWebServiceRequest();


   for(int i=0; i< 9; i++){
       MyRequestType type= new MyRequestType ();
       type.setA(1);
       type.setB(2);
       mywebService.add(type);
   }

现在，代码创建了一个新对象并将其添加到列表中，但是每个对象都不相同.两个片段中唯一的区别是，第二个片段中的对象不相同，但第一个片段中的对象相同，但相加了10倍.

The code now makes a new object and add to list , but every object is different . The only difference in two snippets is , the Objects in the second snippet are not same , but in the first snippet its same but added 10 times.

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