In, Java 8, write a program using only recursion, streams, maps, and folds that
ID: 3574247 • Letter: I
Question
In, Java 8, write a program using only recursion, streams, maps, and folds that accepts a infix arithmetic expression and outputs a numeric evalution of the expression and a string representing the arithmetic expression as an S-Expression. Must accept +,-,*,/,>,<,^,!,(,)
Explanation / Answer
public class Java8Tester { public static void main(String args[]){ Java8Tester tester = new Java8Tester(); //with type declaration MathOperation addition = (int a, int b) -> a + b; //with out type declaration MathOperation subtraction = (a, b) -> a - b; //with return statement along with curly braces MathOperation multiplication = (int a, int b) -> { return a * b; }; //without return statement and without curly braces MathOperation division = (int a, int b) -> a / b; System.out.println("10 + 5 = " + tester.operate(10, 5, addition)); System.out.println("10 - 5 = " + tester.operate(10, 5, subtraction)); System.out.println("10 x 5 = " + tester.operate(10, 5, multiplication)); System.out.println("10 / 5 = " + tester.operate(10, 5, division)); //with parenthesis GreetingService greetService1 = message -> System.out.println("Hello " + message); //without parenthesis GreetingService greetService2 = (message) -> System.out.println("Hello " + message); greetService1.sayMessage("Mahesh"); greetService2.sayMessage("Suresh"); } interface MathOperation { int operation(int a, int b); } interface GreetingService { void sayMessage(String message); } private int operate(int a, int b, MathOperation mathOperation){ return mathOperation.operation(a, b); } }