How to check if a Set contains all the items of Another Set in Java - Step by Step Examples

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How to check if a Set contains all the items of Another Set in Java ?

Answer

To check if a Set contains all the items of another Set in Java, you can use the containsAll method.

✐ Examples

1 Check if Set Contains All Items

In this example,

We define two Sets named set1 and set2 containing elements of a specific type.
We use the containsAll method of set1 to check if it contains all the items of set2.
The containsAll method returns true if set1 contains all the items of set2, otherwise it returns false.
Finally, we print the result to standard output.

Java Program

import java.util.*;

class Main {
    public static void main(String[] args) {
        // Define Sets with items
        Set<String> set1 = new HashSet<>(Arrays.asList("apple", "banana", "orange", "grape", "melon"));
        Set<String> set2 = new HashSet<>(Arrays.asList("banana", "orange"));

        // Check if set1 contains all items of set2
        boolean containsAllItems = set1.containsAll(set2);

        // Print result
        System.out.println("Does set1 contain all items of set2? " + containsAllItems);
    }
}

Output

Does set1 contain all items of set2? true

2 Check if Set Does Not Contain All Items

In this example,

We define two Sets named set1 and set2 containing elements of a specific type.
We use the containsAll method of set1 to check if it contains all the items of set2.
The containsAll method returns false if set1 does not contain all the items of set2.
Finally, we print the result to standard output.

Java Program

import java.util.*;

class Main {
    public static void main(String[] args) {
        // Define Sets with items
        Set<String> set1 = new HashSet<>(Arrays.asList("apple", "banana", "orange", "grape", "melon"));
        Set<String> set2 = new HashSet<>(Arrays.asList("banana", "peach"));

        // Check if set1 contains all items of set2
        boolean containsAllItems = set1.containsAll(set2);

        // Print result
        System.out.println("Does set1 contain all items of set2? " + containsAllItems);
    }
}

Output

Does set1 contain all items of set2? false

Summary

In this tutorial, we learned How to check if a Set contains all the items of Another Set in Java language with well detailed examples.

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How to check if a Set contains all the items of Another Set in Java - Step by Step Examples

How to check if a Set contains all the items of Another Set in Java ?

Answer

✐ Examples

1 Check if Set Contains All Items

Java Program

Output

2 Check if Set Does Not Contain All Items

Java Program

Output

Summary

More Java Sets Tutorials