Java Stream - 如何使用有效的最终变量

import java.util.function.IntUnaryOperator;

public class Main {
   public static void main(String[] args) {
      Integer number2 = 10;
      // accessed number2 and it's not final inside a lambda
      incrementEffectivelyFinalVar(x -> x + number2);
   }
   public static void incrementEffectivelyFinalVar(IntUnaryOperator operator) {
      System.out.println("operator.applyAsInt(1) = " + operator.applyAsInt(1));
   }

}