5 Different Ways To Copy List To Another In Java

When starting on working with Java more frequently because of a change of stuff to work on, I am starting to notice the little details that Java provides. One of them is about Java Collections. To be more precise, List, Set, and Map really caught my attention. Well, although Map is not really part of Collections, I found myself using them quite a lot of times.

You will definitely find yourself deal with them a lot when you are writing the program logic to handle values or data. However, unlike normal programmer who might just brush it off as they learn about them very early on, these things actually piqued my interest further causing me to wanting to actually think more about them. However, the one thing that I am particularly interested in is copying of List as List is probably one of the most commonly used Collections out there.

So, in this article, I will be talking about List, especially how to copy one List to another List. What is a List? A List is an ordered collection of objects in which duplicate values are allowed to be stored. It also preserves insertion order. There are multiple ways on how to copy a list to another list. In order to copy a list to another list, there are about 5 ways of doing it:

The ways are not limited to the mentioned 5 only as there might be some more new ways coming up in the future with newer Java version releases. However, they are what I know for now.

So let’s get started!

Use the List constructor that takes in a collection as its argument. Just pass it another List object to create a new copy out of it.

Syntax:

In this case, we are using a simple ArrayList class which implements the List interface. If you follow the syntax, it will be something like this example:

Related posts:

Social distancing is not always an option. In an LAist investigation, Yingjie Wang uncovers an epidemic of overcrowding in Chinese “boarding houses” with “toothless oversight.” Workers living in…

The first time I learned Redux… I didn’t like it. My projects were getting bigger and I could see the advantage of having a place to store data globally, but setting it all up felt a bit tedious and…

If you went to Christchurch, New Zealand after September 2010, you would be struck by the amount of change and anticipation felt amongst local residence. After going through a number of devastating…