In java8, how to set the global value in the lambdas foreach block?

Question

    public void test(){
       String x;
       List list=Arrays.asList(\"a\",\"b\",\"c\",\"d\");

       list.forEach(n->{
          if(n.equals(\"         


        

Answer 1

1. No you can't do it. (Although you should have tried it yourself)
2. Because variables used within anonymous inner classes and lambda expression have to be effectively final.

3. you can achieve the same more concisely using filter and map.

   Optional d = list.stream()
                            .filter(c -> c.equals("d"))
                            .findFirst()
                            .map(c -> "match the value");