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Java program to remove all elements of HashSet collection
Java example to remove all elements of HashSet collection.
Submitted by Nidhi, on May 08, 2022
Problem Solution:
In this program, we will create a set using the HashSet collection to store integer elements. Then we will remove all elements of HashSet using the clear() method.
Program/Source Code:
The source code to remove all elements of the HashSet collection is given below. The given program is compiled and executed successfully.
// Java program to remove all elements of
// HashSet collection
import java.util.*;
public class Main {
public static void main(String[] args) {
HashSet < Integer > nums = new HashSet();
nums.add(1);
nums.add(2);
nums.add(3);
nums.add(4);
System.out.println("Set items: ");
Iterator < Integer > itr = nums.iterator();
while (itr.hasNext()) {
System.out.println(" " + itr.next());
}
nums.clear();
System.out.println("Set items: ");
Iterator < Integer > itr1 = nums.iterator();
while (itr1.hasNext()) {
System.out.println(" " + itr1.next());
}
}
}
Output:
Set items:
1
2
3
4
Set items:
Explanation:
In the above program, we imported the "java.util.*" package to use the HashSet collection. Here, we created a public class Main that contains a main() method.
The main() method is the entry point for the program. And, we created a set nums to store integer data elements using HashSet collection. Then we removed all elements from the nums HashSet. After that, we printed the updated collection.
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