Calculator V2

Calculator.java

package meshredded;

import java.util.ArrayList;
import java.util.List;
import java.util.function.IntBinaryOperator;

class Calculator {
	public static void main(String[] args) {

		List<String> entries = new ArrayList<>();
		entries.add("3 + 5");
		entries.add("4 - 1");
		entries.add("6 / 2");
		entries.add("3 * 2");

		entries.forEach(entry -> {

			String[] splited = entry.split("\\+|\\-|\\/|\\*");
			int left = new Integer(splited[0].trim());
			int right = new Integer(splited[1].trim());
			String symbol = entry.replaceAll("[0-9]|\\s", "");

			int result = 0;
			for (Operation op : Operation.values()) {
				if (op.getSymbol().equals(symbol)) {
					result = op.applyAsInt(left, right);
					System.out.println(entry + " = " + result);
				}
			}

		});

	}
}

enum Operation implements IntBinaryOperator {
	PLUS      ("+", (l, r) -> l + r),
	MINUS     ("-", (l, r) -> l - r),
	MULTIPLY  ("*", (l, r) -> l * r),
	DIVIDE    ("/", (l, r) -> l / r);

	private final String symbol;
	private final IntBinaryOperator binaryOperator;

	private Operation(final String symbol, final IntBinaryOperator binaryOperator) {
		this.symbol = symbol;
		this.binaryOperator = binaryOperator;
	}

	public String getSymbol() {
		return symbol;
	}

	@Override
	public int applyAsInt(int left, int right) {
		return binaryOperator.applyAsInt(left, right);
	}

}