如何在 Java 中备份 ArrayList? [英] How to backup ArrayList in Java?

问题描述

我将一些数据存储为 ArrayList.当我想备份这些数据时，java 永远绑定了两个对象.这意味着当我更改数据 ArrayList 中的值时，此更改会备份.我尝试将数据中的值分别复制到循环中的备份，尝试使用方法 data.clone() — 没有任何帮助.

I have some data stored as ArrayList. And when I want to backup this data,java bounds two objects forever. Which means when I change values in data ArrayList this changes come to backup. I tried to copy values from data separately to backup in the loop, tried to use method data.clone() — nothing helps.

推荐答案

我认为您需要 .clone() 单个对象.克隆 ArrayList 并不深"；它只会克隆对对象的引用.

I think you need to .clone() the individual objects. Cloning the ArrayList is not "deep"; it will only clone the references to the object.

这篇关于如何在 Java 中备份 ArrayList?的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持IT屋！