How to check if a Specific Item is present in the Set in Java - Step by Step Examples

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How to check if a Specific Item is present in the Set in Java ?

Answer

To check if a specific item is present in a Set in Java, you can use the contains method.

✐ Examples

1 Check if Item is Present

In this example,

We define a Set object named mySet containing elements of a specific type.
We use the contains method of the Set to check if a specific item is present.
The contains method returns true if the item is present in the Set, otherwise it returns false.
Finally, we print the result to standard output.

Java Program

import java.util.HashSet;
import java.util.Set;

public class Main {
    public static void main(String[] args) {
        // Define Set with items
        Set<String> mySet = new HashSet<>();
        mySet.add("apple");
        mySet.add("banana");
        mySet.add("orange");
        mySet.add("grape");
        mySet.add("melon");

        // Check if item is present
        String item = "banana";
        boolean isPresent = mySet.contains(item);

        // Print result
        System.out.println("Is " + item + " present in the Set? " + isPresent);
    }
}

Output

Is banana present in the Set? true

2 Check if Item is Not Present

In this example,

We define a Set object named mySet containing elements of a specific type.
We use the contains method of the Set to check if a specific item is not present.
The contains method returns false if the item is not present in the Set.
Finally, we print the result to standard output.

Java Program

import java.util.HashSet;
import java.util.Set;

public class Main {
    public static void main(String[] args) {
        // Define Set with items
        Set<String> mySet = new HashSet<>();
        mySet.add("apple");
        mySet.add("banana");
        mySet.add("orange");
        mySet.add("grape");
        mySet.add("melon");

        // Check if item is not present
        String item = "peach";
        boolean isNotPresent = !mySet.contains(item);

        // Print result
        System.out.println("Is " + item + " not present in the Set? " + isNotPresent);
    }
}

Output

Is peach not present in the Set? true

Summary

In this tutorial, we learned How to check if a Specific Item is present in the Set in Java language with well detailed examples.

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How to check if a Specific Item is present in the Set in Java - Step by Step Examples

How to check if a Specific Item is present in the Set in Java ?

Answer

✐ Examples

1 Check if Item is Present

Java Program

Output

2 Check if Item is Not Present

Java Program

Output

Summary

More Java Sets Tutorials