Java Streams - IntStream findFirst() example

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IntStream findFirst() returns an OptionalInt describing the first element of this stream, or an empty OptionalInt if the stream is empty.

Syntax

findFirst has the following syntax.

OptionalInt findFirst()

Example

The following example shows how to use findFirst.

import java.util.OptionalInt;
import java.util.stream.IntStream;
//  w w w .j  av a 2s.  c o m
public class Main {
  public static void main(String[] args) {
    IntStream i = IntStream.of(1, 2, 3, 4);
    OptionalInt n = i.findFirst();
    if(n.isPresent()){
      System.out.println(n.getAsInt());
    }else{
      System.out.println("noValue");
    }
  }
}

The code above generates the following result.

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