Скачать или смотреть java set hashset

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sure! in java, a `hashset` is a part of the java collections framework and implements the `set` interface. it is used to store a collection of unique elements, meaning it does not allow duplicate values. `hashset` is backed by a hash table, which provides constant time performance for basic operations such as add, remove, and contains, under typical circumstances.

key features of hashset

1. **unique elements**: hashset does not allow duplicate values.
2. **unordered**: the elements in a hashset are not stored in any particular order. the order can change over time.
3. **null values**: hashset allows one null element.
4. **performance**: it offers o(1) time complexity for basic operations like add, remove, and contains (on average).
5. **thread safety**: hashset is not synchronized, which means it's not thread-safe. if multiple threads access a hashset concurrently, and at least one of the threads modifies it, you must synchronize it externally.

how to use hashset

1. **import the hashset class**: you need to import `java.util.hashset`.
2. **create a hashset**: you can create a hashset using the default constructor or a constructor that takes a collection.
3. **add elements**: use the `add()` method to add elements.
4. **remove elements**: use the `remove()` method to remove elements.
5. **check for elements**: use the `contains()` method to check if an element exists.
6. **iterate over elements**: you can use an iterator, for-each loop, or java streams to iterate over elements.

example code

here is a simple example demonstrating the usage of `hashset` in java:



explanation of the code

1. **creating hashset**: we create a new `hashset` named `hashset` that will store `string` elements.
2. **adding elements**: we add several fruits to the hashset. notice that adding "apple" twice doesn’t create a duplicate.
3. **checking existence**: we check if "banana" exists in the set using the `contains()` method.
4. **removing an element**: we remove "man ...

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