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How to Find All Duplicates in a List in Java

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Need to find all the duplicates in a Java List? Maybe a Java ArrayList, a Vector or even just an array? There are a few different approaches you can take
- I prefer the use of the Java Streams API to find all duplicates in a List.
- The use of a HashSet to find all the duplicates was popular before the Streams API was released.
- A brute force comparison to dedupe a list using nested loops is a popular approach to help learn language syntax.
- A combined use of multiple Lists and HashSets is fun too!
In this video tutorial on how to find Java List duplicates, we demonstrate each of these approaches, including a way to use the Java Collections class to find the frequency of duplicates in a List as well.
If you want to find all the duplicates in a list, and eventually remove those duplicates, this quick Java tutorial on deduping is for you!
- I prefer the use of the Java Streams API to find all duplicates in a List.
- The use of a HashSet to find all the duplicates was popular before the Streams API was released.
- A brute force comparison to dedupe a list using nested loops is a popular approach to help learn language syntax.
- A combined use of multiple Lists and HashSets is fun too!
In this video tutorial on how to find Java List duplicates, we demonstrate each of these approaches, including a way to use the Java Collections class to find the frequency of duplicates in a List as well.
If you want to find all the duplicates in a list, and eventually remove those duplicates, this quick Java tutorial on deduping is for you!
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