Java HashSet - contains() Method
The java.util.HashSet.contains() method is used to check whether the set contains the specified element or not. It returns true if the set contains the specified element, else returns false.
Syntax
public boolean contains(Object obj)
Parameters
obj |
Specify element whose presence in the set need to be tested. |
Return Value
Returns true if the set contains the specified element, else returns false.
Exception
NA
Example:
In the example below, the java.util.HashSet.contains() method is used to check the presence of specified element in the given set.
import java.util.*;
public class MyClass {
public static void main(String[] args) {
//creating hash set
HashSet<Integer> MySet = new HashSet<Integer>();
//populating hash set
MySet.add(10);
MySet.add(20);
MySet.add(30);
MySet.add(40);
//checking the presence of elements
for(int i = 5; i <= 20; i += 5) {
if(MySet.contains(i))
System.out.println(i +" is present in MySet.");
else
System.out.println(i +" is NOT present in MySet.");
}
}
}
The output of the above code will be:
5 is NOT present in MySet. 10 is present in MySet. 15 is NOT present in MySet. 20 is present in MySet.
❮ Java.util - HashSet
