How to check if a Set is Not Empty in Java - Step by Step Examples

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How to check if a Set is Not Empty in Java ?

Answer

To check if a Set is not empty in Java, you can use the isEmpty method or compare the size to zero.

✐ Examples

1 Check if Set is Not Empty Using isEmpty Method

In this example,

We define a non-empty set named mySet containing elements of a specific type.
We use the isEmpty method to check if the set is not empty.
If the isEmpty method returns false, then the set is not empty; otherwise, it is empty.

Java Program

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

public class Main {
    public static void main(String[] args) {
        // Define non-empty set
        Set<String> mySet = new HashSet<>();
        mySet.add("apple");
        mySet.add("banana");
        mySet.add("orange");

        // Check if set is not empty using isEmpty method
        if (!mySet.isEmpty()) {
            System.out.println("Set is not empty");
        } else {
            System.out.println("Set is empty");
        }
    }
}

Output

Set is not empty

2 Check if Set is Not Empty Using size Method

In this example,

We define a non-empty set named mySet containing elements of a specific type.
We use the size method to get the number of elements in the set.
If the size is greater than zero, then the set is not empty; otherwise, it is empty.

Java Program

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

public class Main {
    public static void main(String[] args) {
        // Define non-empty set
        Set<String> mySet = new HashSet<>();
        mySet.add("apple");
        mySet.add("banana");
        mySet.add("orange");

        // Check if set is not empty using size method
        if (mySet.size() > 0) {
            System.out.println("Set is not empty");
        } else {
            System.out.println("Set is empty");
        }
    }
}

Output

Set is not empty

Summary

In this tutorial, we learned How to check if a Set is Not Empty in Java language with well detailed examples.

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How to check if a Set is Not Empty in Java - Step by Step Examples

How to check if a Set is Not Empty in Java ?

Answer

✐ Examples

1 Check if Set is Not Empty Using isEmpty Method

Java Program

Output

2 Check if Set is Not Empty Using size Method

Java Program

Output

Summary

More Java Sets Tutorials