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Checking if a HashSet contains certain value in Java
Let’s say the following is our Integer array −
Integer arr[] = { 50, 100, 150, 200, 250, 300 };Set the above integer array in HashSet −
Set<Integer>set = new HashSet<Integer>(Arrays.asList(arr));
Now, let us check whether the HashSet contains certain value or not −
set.contains(150)
TRUE is returned if the value is in the List, else FALSE is the return value.
Example
import java.util.Arrays;
import java.util.HashSet;
import java.util.Set;
public class Demo {
public static void main(String[] a) {
Integer arr[] = { 50, 100, 150, 200, 250, 300 };
Set<Integer>set = new HashSet<Integer>(Arrays.asList(arr));
System.out.println(set.contains(200));
System.out.println(set.contains(150));
System.out.println(set.contains(100));
System.out.println(set.contains(10));
}
}Output
true true true false
Updated on: 30-Jul-2019
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