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Check for an element in a HashSet in Java
To check whether an element is in a HashSet or not in Java, use the contains() method.
Create a HashSet −
HashSet hs = new HashSet();
Add elements to it −
hs.add("R");
hs.add("S");
hs.add("T");
hs.add("V");
hs.add("W");
hs.add("Y");
hs.add("Z");To check for an element, for example, S here, use the contains() −
hs.contains("S")The following is an example to check for an element in a HashSet −
Example
import java.util.*;
public class Demo {
public static void main(String args[]) {
HashSet hs = new HashSet();
// add elements to the HashSet
hs.add("R");
hs.add("S");
hs.add("T");
hs.add("V");
hs.add("W");
hs.add("Y");
hs.add("Z");
System.out.println("Set = "+hs);
System.out.println("Is character S part of the set? "+hs.contains("S"));
System.out.println("Is character B part of the set? "+hs.contains("B"));
}
}Output
Set = [R, S, T, V, W, Y, Z] Is character S part of the set? true Is character B part of the set? false
Updated on: 30-Jul-2019
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