How do I determine whether an array contains a particular value in Java?

 

You can determine whether an array contains a particular value in Java by iterating through the array and comparing each element to the target value. Here's how you can do it:

1. Using a Loop:

java

public class ArrayContainsValueExample {

    public static boolean containsValue(int[] array, int targetValue) {
        for (int value : array) {
            if (value == targetValue) {
                return true;
            }
        }
        return false;
    }

    public static void main(String[] args) {
        int[] numbers = {10, 20, 30, 40, 50};
        int targetValue = 30;

        if (containsValue(numbers, targetValue)) {
            System.out.println("The array contains the target value.");
        } else {
            System.out.println("The array does not contain the target value.");
        }
    }
}

In this example, the containsValue method iterates through the array and compares each element to the targetValue. If a match is found, the method returns true. Otherwise, it returns false.

2. Using Arrays.asList() and contains() (for non-primitive types):

For arrays of non-primitive types (like objects), you can use the Arrays.asList() method and the contains() method of the List interface to check for a value:

java

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

public class ArrayContainsValueExample {

    public static void main(String[] args) {
        String[] names = {"Alice", "Bob", "Charlie"};
        String targetName = "Bob";

        List<String> nameList = Arrays.asList(names);

        if (nameList.contains(targetName)) {
            System.out.println("The array contains the target name.");
        } else {
            System.out.println("The array does not contain the target name.");
        }
    }
}

In this example, the array of strings is converted into a List, and the contains() method is used to check for the presence of a specific name.

Remember that these methods work for arrays of non-primitive types. For arrays of primitive types (like int[]), you need to use the loop approach demonstrated in the first example.