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

How to check if a List contains all the elements of Another List in Java ?

Answer

To check if a List contains all the elements of another List in Java, you can use the containsAll method of the List interface.

✐ Examples

1 Check if List Contains All Elements of Another List (Integers)

In this example,

We create two Lists named list1 and list2 containing integers.
We use the containsAll method of list1 to check if it contains all elements of list2.
The containsAll method returns true if all elements of list2 are present in list1; otherwise, it returns false.
Finally, we print the result to standard output.

Java Program

import java.util.List;
import java.util.Arrays;

public class Main {
    public static void main(String[] args) {
        List<Integer> list1 = Arrays.asList(1, 2, 3, 4, 5);
        List<Integer> list2 = Arrays.asList(2, 4);
        boolean result = list1.containsAll(list2);
        System.out.println("List 1 contains all elements of List 2: " + result);
    }
}

Output

List 1 contains all elements of List 2: true

2 Check if List Contains All Elements of Another List (Strings)

In this example,

We create two Lists named list1 and list2 containing strings.
We use the containsAll method of list1 to check if it contains all elements of list2.
The containsAll method returns true if all elements of list2 are present in list1; otherwise, it returns false.
Finally, we print the result to standard output.

Java Program

import java.util.List;
import java.util.Arrays;

public class Main {
    public static void main(String[] args) {
        List<String> list1 = Arrays.asList("apple", "banana", "orange", "kiwi");
        List<String> list2 = Arrays.asList("banana", "kiwi");
        boolean result = list1.containsAll(list2);
        System.out.println("List 1 contains all elements of List 2: " + result);
    }
}

Output

List 1 contains all elements of List 2: true

Summary

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

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

How to check if a List contains all the elements of Another List in Java ?

Answer

✐ Examples

1 Check if List Contains All Elements of Another List (Integers)

Java Program

Output

2 Check if List Contains All Elements of Another List (Strings)

Java Program

Output

Summary

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