Скачать или смотреть How to Check if a Value Exists in an ArrayList in Java

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import java.util.ArrayList;

public class Example {
public static void main(String[] args) {

myList.add("apple");
myList.add("banana");
myList.add("orange");

// Check if "apple" exists in the list
if (myList.contains("apple")) {
System.out.println("The list contains 'apple'");
} else {
System.out.println("The list does not contain 'apple'");
}

// Check if "grape" exists in the list
if (myList.contains("grape")) {
System.out.println("The list contains 'grape'");
} else {
System.out.println("The list does not contain 'grape'");
}
}
}