Arrays.asList(yourArray).contains(yourValue)
Warning: this doesn't work for arrays of primitives (see the comments).
Since java-8 you can now use Streams.
String[] values = {"AB","BC","CD","AE"};
boolean contains = Arrays.stream(values).anyMatch("s"::equals);
To check whether an array of int, double or long contains a value use IntStream, DoubleStream or LongStream respectively.
Example
int[] a = {1,2,3,4};
boolean contains = IntStream.of(a).anyMatch(x -> x == 4);
Top answer 1 of 16
3431
Arrays.asList(yourArray).contains(yourValue)
Warning: this doesn't work for arrays of primitives (see the comments).
Since java-8 you can now use Streams.
String[] values = {"AB","BC","CD","AE"};
boolean contains = Arrays.stream(values).anyMatch("s"::equals);
To check whether an array of int, double or long contains a value use IntStream, DoubleStream or LongStream respectively.
Example
int[] a = {1,2,3,4};
boolean contains = IntStream.of(a).anyMatch(x -> x == 4);
2 of 16
465
Concise update for Java SE 9
Reference arrays are bad. For this case we are after a set. Since Java SE 9 we have Set.of.
private static final Set<String> VALUES = Set.of(
"AB","BC","CD","AE"
);
"Given String s, is there a good way of testing whether VALUES contains s?"
VALUES.contains(s)
O(1).
The right type, immutable, O(1) and concise. Beautiful.*
Original answer details
Just to clear the code up to start with. We have (corrected):
public static final String[] VALUES = new String[] {"AB","BC","CD","AE"};
This is a mutable static which FindBugs will tell you is very naughty. Do not modify statics and do not allow other code to do so also. At an absolute minimum, the field should be private:
private static final String[] VALUES = new String[] {"AB","BC","CD","AE"};
(Note, you can actually drop the new String[]; bit.)
Reference arrays are still bad and we want a set:
private static final Set<String> VALUES = new HashSet<String>(Arrays.asList(
new String[] {"AB","BC","CD","AE"}
));
(Paranoid people, such as myself, may feel more at ease if this was wrapped in Collections.unmodifiableSet - it could then even be made public.)
(*To be a little more on brand, the collections API is predictably still missing immutable collection types and the syntax is still far too verbose, for my tastes.)
Career Karma
careerkarma.com › blog › java › java array contains
Java Array Contains: The Complete Guide | Career Karma
December 1, 2023 - In Java, arrays are containers that hold data of a single type. For example, an array could hold a list of names of 14 bird species you saw in your backyard bird watching this year. Such an array would contain 14 string values.
java - Find if a String is present in an array - Stack Overflow
I tried looking in Java docs but all I am getting is things that I don't want like questions and stuff... so, how is this done? I know there is a "in array" function but I'm not too good with combining the two together. ... String[] dan = {"Red", "Orange", "Yellow", "Green", "Blue", "Violet", "Orange", "Blue"}; boolean contains ... More on stackoverflow.com
How do I know if an array list contains an specific string
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9
May 12, 2022java - How can I verify that an array of strings contain a certain string? - Stack Overflow
Given : String[] directions = {"UP","DOWN","RIGHT","LEFT","up","down","right","left"}; String input = "Up"; How can I verify that an input from stdin is within the directions array or not ? I can More on stackoverflow.com
how to check if two items are in a java array
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September 22, 202211:03
Check If a Value is Present in an Array in Java - GeeksforGeeks
04:18
Java Program to Check if An Array Contains a Given Value - YouTube
How to Check if an Array Contains a Value in Java
04:00
How do I determine whether an array contains a particular value ...
12:15
How to check if Java Array contains a value or not? | Java Inspires ...
Mkyong
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Java – Check if Array contains a certain value? | mkyong.com
November 19, 2016 - package com.mkyong.core; import ... PrimitiveArrayExample1 { public static void main(String[] args) { int[] number = {1, 2, 3, 4, 5, 6, 7, 8, 9, 10}; if(contains(number, 2)){ System.out.println("Hello 2"); } } public static boolean ...
How to do in Java
howtodoinjava.com › home › java array › check if array contains an item in java
Check if Array Contains an Item in Java
February 3, 2023 - String[] fruits = new String[] { "banana", "guava", "apple", "cheeku" }; Arrays.asList(fruits).contains("apple"); // true Arrays.asList(fruits).indexOf("apple"); // 2 Arrays.asList(fruits).contains("lion"); // false Arrays.asList(fruits).in...
Stack Abuse
stackabuse.com › java-check-if-array-contains-value-or-element
Java: Check if Array Contains Value or Element
November 19, 2020 - ... Integer[] intArray = new Integer[]{1, 2, 3, 4, 5}; String[] nameArray = new String[]{"John", "Mark", "Joe", "Bill", "Connor"}; List<Integer> intList = new ArrayList<>(Arrays.asList(intArray)); List<String> nameList = new ArrayList<>(Arrays.asList(nameArray)); System.out.println(intList...
Java Code Geeks
examples.javacodegeeks.com › home › java development › core java
Java Array Contains Example - Java Code Geeks
August 14, 2020 - In the example, I demonstrated four ways to find an element in an array: Utilize Java AbstractCollection.contains.
Baeldung
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Check if a Java Array Contains a Value | Baeldung
September 7, 2024 - public void searchArrayReuseList() { List asList = Arrays.asList(SearchData.strings); for (int i = 0; i < SearchData.count; i++) { asList.contains("T"); } } public void searchArrayReuseSet() { Set asSet = new HashSet<>(Arrays.asList(SearchD...
Whitman College
whitman.edu › mathematics › java_tutorial › java › nutsandbolts › arraysAndStrings.html
Arrays and Strings
A sequence of character data is called a string and is implemented in the Java environment by the String class (a member of the java.lang package). The character-counting program uses Strings in two different places. The first is in the definition of the main() method: String[] args This code explicitly declares an array, named args, that contains String objects. The empty brackets indicate that the length of the array is unknown at compilation time because the array is passed in at runtime. The second use of Strings in the example program are these two uses of literal strings (a string of characters between double quotation marks " and "):
TutorialKart
tutorialkart.com › java › java-array › java-array-contains
How to check if Java Array Contains specific Object/Element?
November 23, 2020 - In this tutorial, we will learn how to check if a Java Array contains a given value or not. To check if an element is present in the array or not, we have to traverse through the array elements one by one, and check if the element of array equals the search element. The logic to check the equality may change with datatype. For example, to check if two integers are equal, we can use equal to comparison operator, but to check if two strings are equal, we may have to use String.equals() function.
Delft Stack
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How to Check an Array Contains a Particular Value in Java | Delft Stack
February 2, 2024 - package findInList; import ... main(String[] args) { String[] arr = new String[] {"1", "2", "3"}; String stringToSearch = "2"; System.out.println(Arrays.asList(arr).contains(stringToSearch)); } }...
Programiz
programiz.com › java-programming › examples › array-contains-value
Java Program to Check if An Array Contains a Given Value
import java.util.Arrays; class Main { public static void main(String[] args){ String[] strings = {"One","Two","Three","Four","Five"}; String toFind= "Four"; boolean found = Arrays.stream(strings).anyMatch(t -> t.equals(toFind)); if(found) System.out.println(toFind + " is found."); else ...
Top answer 1 of 5
82
This is what you're looking for:
List<String> dan = Arrays.asList("Red", "Orange", "Yellow", "Green", "Blue", "Violet", "Orange", "Blue");
boolean contains = dan.contains(say.getText());
If you have a list of not repeated values, prefer using a Set<String> which has the same contains method
2 of 5
40
String[] a= {"tube", "are", "fun"};
Arrays.asList(a).contains("any");
Sentry
sentry.io › sentry answers › java › find a specific value in an array in java
Java Find a Specific Value in an Array Using Streams | Sentry
September 23, 2026 - For example, to find a string in an array of strings, we could use the following code: import java.util.Arrays; public class Main { public static void main(String[] args) { String[] products = new String[]{"Coffee", "Tea", "Chocolate Bar"}; if ...
Centron
centron.de › home › tutorials › how to check if java array contains a value?
How to Check if Java Array Contains a Value? – centron
December 1, 2024 - Let’s use JShell to run the example code snippet. ... jshell> String[] vowels = { "A", "I", "E", "O", "U" }; vowels ==> String[5] { "A", "I", "E", "O", "U" } jshell> List vowelsList = Arrays.asList(vowels); vowelsList ==> [A, I, E, O, U] jshell> vowelsList.contains("U") $3 ==> true jshell> vowelsList.contains("X") $4 ==> false · If you are using Java 8 or higher, you can create a stream from the array.
Reddit
reddit.com › r/javahelp › how do i know if an array list contains an specific string
r/javahelp on Reddit: How do I know if an array list contains an specific string
May 12, 2022 -
I created an array list out from a constructor, now what I want to do is that the program will only print those set of array list with the item that matches the search key. I tried using arraylist.contains but it won't work. Is there any method I can use to know whether the array contains a specific certain string? Thank you!
Top answer 1 of 6
7
I guess the easiest answer would be to create a for loop with the int starting at 0 until it goes to arrayList.size() and increments by 1 each iteration. Then inside the loop, do an if statement that asks arraylist.get(int). equals(searchStr) and inside the if statement have it print arrayList.get(int).
2 of 6
3
You search through the ArrayList? You iterate over the list and compare the respective element with the sought string. Really, this is a trivial task. Stop looking for built-in methods. Start learning how to manually do these things. This is what programming is about. Later, when you understand how to create your own solutions, you should start looking for built-in versions. Then, you will also have the knowledge to understand how to use them. I tried using arraylist.contains but it won't work. This is the worst way to describe a problem. This is like going to the mechanic and telling them that the car does not work. No problem description at all. This leaves us to blind guessing. Show your code, show your attempts, describe how it fails.
Top answer 1 of 5
62
Convert the array of valid directions to a list:
List valid = Arrays.asList(directions)
Or just declare it directly as:
List valid = Arrays.asList("UP", "DOWN", "RIGHT", "LEFT", "up", "down", "right", "left")
You can then use the contains method:
if (valid.contains(input)) {
// is valid
} else {
// not valid
}
Note that this won't match a mixed case input such as "Up" so you might want to store just the uppercase values in the list and then use valid.contains(input.toUpperCase())
2 of 5
6
Convert your array to a List and than use the contains method.
List mylist = Arrays.asList(directions);
mylist.contains(input);
The contains method returns:
true if the list contains the specified element.
Coderanch
coderanch.com › t › 406173 › java › determine-string-array-string
How can I determine if a string array contains a particular string? (Beginning Java forum at Coderanch)
February 15, 2007 - And the collection classes that implement List all have a method "contains". You can take an ArrayList for example: If you don't like generics in your compositions, you can omit the <String> in this case. Yours, Bu. ... In an unordered list (java.util.List, array), you will definitely have ...
DigitalOcean
digitalocean.com › community › tutorials › java-array-contains-value
How to Check if a Java Array Contains a Value? | DigitalOcean
September 16, 2025 - Learn 4 proven methods to check if Java array contains value: for-loops, Streams, Arrays.asList(), and binarySearch(). Choose the right approach today!
Attacomsian
attacomsian.com › blog › java-array-contains-value
How to check if an array contains a value in Java
December 1, 2019 - String[] names = {"Atta", "John", "Emma", "Tom"}; // convert array to list List<String> list = Arrays.asList(names); // check if `Emma` exists in list if(list.contains("Emma")) { System.out.println("Hi, Emma ?"); } ... In Java 8 or higher, you ...
Apps Developer Blog
appsdeveloperblog.com › home › java › java examples › check if array contains a value in java
Check if Array Contains a Value in Java - Apps Developer Blog
August 16, 2022 - In this way, we are implementing our logic to check if array contains a particular value, which is, in our case, the word “Java”. ... class CheckIfArrayContainsValue { public static void main(String[] args) { String[] programmingLanguages = {"Python", "Kotlin", "Ruby", "JavaScript", "C#", "Java", "Flutter"}; for (String lang : programmingLanguages) { if (lang.equals("Java")) { System.out.println("It does contain!"); break; // value found, exit the loop } } } }