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LinkedHashSet contains() method in Java with Examples

  • Last Updated : 12 Oct, 2018

The contains() method of java.util.LinkedHashSet class is used to return true if this set contains the specified element otherwise false.

Syntax:

public boolean contains(Object o)

Parameters: This method takes element o as parameter whose presence in this set is to be tested.

Return Value: This method returns true if this set contains the specified element.

Below are the examples to illustrate the contains() method.



Example 1:




// Java program to demonstrate
// contains() method
// for String value
  
import java.util.*;
  
public class GFG1 {
    public static void main(String[] argv) throws Exception
    {
        try {
  
            // Create the object of LinkedHashSet<String>
            LinkedHashSet<String>
                linkset = new LinkedHashSet<String>();
  
            // populate hash set
            linkset.add("A");
            linkset.add("B");
            linkset.add("C");
  
            // print the LinkedHashSet
            System.out.println("LinkedHashSet: "
                               + linkset);
  
            // check the existence of element
            // using method contains()
            boolean exist = linkset.contains("C");
  
            // print the result
            System.out.println("Is the element"
                               + " 'C' present: "
                               + exist);
        }
  
        catch (NullPointerException e) {
            System.out.println("Exception thrown : " + e);
        }
    }
}
Output:
LinkedHashSet: [A, B, C]
Is the element 'C' present: true

Example 2:




// Java program to demonstrate
// contains() method
// for Integer value
  
import java.util.*;
  
public class GFG1 {
    public static void main(String[] argv) throws Exception
    {
        try {
  
            // Create the object of LinkedHashSet<Integer>
            LinkedHashSet<Integer>
                linkset = new LinkedHashSet<Integer>();
  
            // populate hash set
            linkset.add(10);
            linkset.add(20);
            linkset.add(30);
  
            // print the LinkedHashSet
            System.out.println("LinkedHashSet: "
                               + linkset);
  
            // check the existence of element
            // using method contains()
            boolean exist = linkset.contains(25);
  
            // print the result
            System.out.println("Is the element"
                               + " '25' present: "
                               + exist);
        }
  
        catch (NullPointerException e) {
            System.out.println("Exception thrown : " + e);
        }
    }
}
Output:
LinkedHashSet: [10, 20, 30]
Is the element '25' present: false

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