Create Optional object - Java Lambda Stream

Java examples for Lambda Stream:Optional

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Description

Create Optional object

Demo Code


import java.util.Optional;

public class OptionalMain {
  public static void main(String[] args) {
    System.out.println(sum(Optional.ofNullable(2), Optional.ofNullable(null)));
  }/*from  ww  w. ja  v  a2 s  .  com*/

  public static int sum(Optional<Integer> a, Optional<Integer> b) {
    Integer val1 = null;
    Integer val2 = null;
    val1 = a.orElse(new Integer(0));
    val2 = b.orElse(new Integer(0));
    // val1 = a.get();
    // val2 = b.get();//java.util.NoSuchElementException: No value present

    return val1 + val2;
  }
}

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