Pass lambda as function parameter - Java Lambda Stream

Description

Pass lambda as function parameter

Demo Code

public class SimpleMain {
  public static void main(String[] args) {
    // Two implemention of Operate class
    Operation sum = (a, b) -> a + b;
    Operation subtract = (a, b) -> a - b;
    StringLength stringLength = a -> a.length();
    System.out.println(sum.doIt(2, 3));
    System.out.println(subtract.doIt(2, 3));
    System.out.println(stringLength.doIt("Hello"));
    doOperation(sum, 2, 3);//from w  ww .  j  av  a 2 s  .  co m
    doOperation(subtract, 3, 2);
    doOperation((a, b) -> a * b, 3, 2);

    StringLength strLamda = (a) -> a.length();
    doStringOp(stringLength, "Hello");
  }

  public static void doOperation(Operation operation, int a, int b) {
    System.out.println(operation.doIt(a, b));
  }

  public static void doStringOp(StringLength stringLength, String str) {
    System.out.println(stringLength.doIt(str));
  }
}

interface Operation {
  int doIt(int a, int b);
}

interface StringLength {
  int doIt(String str);
}

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