Lambda Scope Lab

Instruction

You’re given this starter code:

public interface StringOperator {
  String apply(String s);
}

public class Main {
  String PREFIX = "__prefix__";
  String SUFFIX = "__suffix__";

  // fix the scope error and remove whitespace from str
  public static StringOperator operator = str -> PREFIX + str + SUFFIX;

  public static void main(String[] args) {
    String res = operator.apply("  hello there  ");
    System.out.println(res); // __prefix__hellothere__suffix__
  }
}

Your tasks are to:

• Fix the modifiers of the PREFIX and SUFFIX variables to remove the scope error in the operator lambda expression.
• Update the lambda expression to remove all whitespace from str.

Resources

• java.lang.String