Check out example codes for "arrays .contains methof". It will help you in understanding the concepts better.

Code Example 1

// Convert to stream and test it
	boolean result = Arrays.stream(alphabet).anyMatch("A"::equals);
	if (result) {
		System.out.println("Hello A");
	}
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Code Example 2

package com.mkyong.core;

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

public class StringArrayExample1 {

    public static void main(String[] args) {

        String[] alphabet = new String[]{"A", "B", "C"};

        // Convert String Array to List
        List<String> list = Arrays.asList(alphabet);
        
        if(list.contains("A")){
            System.out.println("Hello A");
        }

    }

}
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Code Example 3

private static final Set<String> VALUES = Set.of(
    "AB","BC","CD","AE"
);

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