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Remove all elements from a HashSet in Java
To remove all the elements from HashSet, use the clear() method.
Create a HashSet and initialize elements −
String strArr[] = { "P", "Q", "R", "S" };
Set s = new HashSet(Arrays.asList(strArr));Now, to remove all the above elements −
s.clear()
The following is an example to remove all elements from a HashSet −
Example
import java.util.Arrays;
import java.util.HashSet;
import java.util.Set;
public class Demo {
public static void main(String[] a) {
String strArr[] = { "P", "Q", "R", "S" };
Set s = new HashSet(Arrays.asList(strArr));
strArr = new String[] { "R", "S", "T", "U" };
s.addAll(Arrays.asList(strArr));
System.out.println("Elements = " +s);
// removing all elements
s.clear();
System.out.println("Set after removing all the elements = " +s);
}
}Output
Elements = [P, Q, R, S, T, U] Set after removing all the elements = []
Updated on: 25-Jun-2020
2K+ Views
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