Different ways to Iterate Set
Learn how to iterate over collections in Java, performing basic operations like accessing and modifying data in sets or lists at rrtutors.com
In Java, a set is used to build collections that use hash tables to store data. Sets store information through a mechanism known as hashing. As a result of hashing, the informational content of a key determines its unique value, called its hash code.
There are two common ways you can use to iterate over a hash set in Java:
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Using an Iterator method
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Without using the Iterator method
Using Iterator method
In this example, we are going to create a Set using the HashSet class and use the iterator() method to iterate over the set.
Example
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import java.util.HashSet; import java.util.Iterator; public class Iterate_set_using_iterators {
public static void main(String[] args) { HashSet<String> hashmanset = new HashSet<String>(); hashmanset.add("Python"); hashmanset.add("Kotlin"); hashmanset.add("Java"); Iterator<String> a = hashmanset.iterator(); while(a.hasNext()){ System.out.println(a.next()); } } } |
Output
Java
Python
Kotlin
Without Using the Iterator method
In this example, we have not used an iterator, however, we have used the for-each method to iterate each element of a set
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import java.util.HashSet; import java.util.Set; public class Iterate_set_Without_Using_Iterator_method { public static void main(String[] args) { Set<String> hset = new HashSet<String>(); hset.add("Python"); hset.add("java"); hset.add("Kotlin");
for (String temp : hset) { System.out.println(temp); } } } |
Output
java
Python
Kotlin
Keyword: How to Iterate over a Set , List Iterator, Set Iterator