Optional.java

package jp.co.confrage;

import java.util.Objects;
import java.util.Optional;

public class OptionalSample {
  public static void main(String[] args) {
    Integer max = Integer.valueOf(1);
    if (Objects.isNull(max)) {
      max = Integer.valueOf(2);
    }
    System.out.println(max); // 1
    // ↓ if文消す
    Optional<Integer> maxtemp = Optional.ofNullable(Integer.valueOf(1));
    max = maxtemp.orElse(Integer.valueOf(2));
    System.out.println(max); // 1
  }
}