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In this guide, you will learn about the Stream allMatch() method in Java programming and how to use it with an example.
1. Stream allMatch() Method Overview
Definition:
The Stream.allMatch() method is a terminal operation that returns a boolean indicating whether all elements of the stream match the given predicate. It's often used to determine if every element in the stream satisfies a particular condition.
Syntax:
boolean allMatch(Predicate<? super T> predicate)Parameters:
- predicate: a non-interfering, stateless predicate to apply to elements of the stream.
Key Points:
- It's a terminal operation, which means it ends the pipeline and you cannot reuse the stream afterward.
- The method returns a boolean value.
- Like anyMatch(), it's a short-circuiting operation. It stops processing as soon as it finds an element that doesn't match the condition.
- If the stream is empty, then the result is true (considered vacuously true, because no elements failed to match the predicate).
- It processes elements in the order they appear until it finds a non-matching element or all elements have been processed.
2. Stream allMatch() Method Example
import java.util.stream.Stream;
public class StreamAllMatchExample {
public static void main(String[] args) {
Stream<String> fruitStream = Stream.of("apple", "banana", "cherry", "date", "elderberry");
// Check if all fruit names have more than 4 characters
boolean allFruitsHaveMoreThan4Chars = fruitStream.allMatch(fruit -> fruit.length() > 4);
System.out.println("Do all fruit names have more than 4 characters? " + allFruitsHaveMoreThan4Chars);
}
}
Output:
Do all fruit names have more than 4 characters? true
Explanation:
In the provided example: We have a stream of fruit names. Using allMatch(), we check if every fruit name has more than 4 characters. Since each name in the stream ("apple", "banana", "cherry", "date", "elderberry") has a length greater than 4, the result is true.
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