added UnaryOperator & BinaryOperator

Author: spdpiyush

Modern-Java-Examples/src/com/learn/functionalInterfaces/BinaryOperatorExample.java

@@ -0,0 +1,28 @@
+package com.learn.functionalInterfaces;
+
+import java.util.Comparator;
+import java.util.function.BinaryOperator;
+
+/**
+ * <p>
+ *     BinaryOperator extends BiFunction Functional Interface.
+ *     Use BinaryOperator, when inputs and output are of same type.
+ * </p>
+ */
+public class BinaryOperatorExample {
+
+    static Comparator<Integer> comparator = (a, b) ->  a.compareTo(b);
+
+
+    public static void main(String[] args) {
+
+        BinaryOperator<Integer> binaryOperator = (num1, num2) -> num1 * num2;
+        System.out.println(binaryOperator.apply(10, 20));
+
+        BinaryOperator<Integer> maxBy = BinaryOperator.maxBy(comparator);
+        System.out.println("Maximum = " + maxBy.apply(10, 20));
+
+        BinaryOperator<Integer> minBy = BinaryOperator.minBy(comparator);
+        System.out.println("Minimum = " + minBy.apply(10, 20));
+    }
+}

Modern-Java-Examples/src/com/learn/functionalInterfaces/UnaryOperatorExample.java

@@ -0,0 +1,18 @@
+package com.learn.functionalInterfaces;
+
+import java.util.function.UnaryOperator;
+
+/**
+ * <p>
+ *     Use UnaryOperator when input and output are of
+ *     same type.
+ * </p>
+ */
+public class UnaryOperatorExample {
+
+    static UnaryOperator<String> unaryOperator = String::toUpperCase;
+
+    public static void main(String[] args) {
+        System.out.println(unaryOperator.apply("test"));
+    }
+}

README.md

@@ -13,6 +13,8 @@ This repository contains the basic & advance level examples related to Java
     * [BiPredicate](Modern-Java-Examples/src/com/learn/functionalInterfaces/BiPredicateExample.java)
     * [Function](Modern-Java-Examples/src/com/learn/functionalInterfaces/FunctionExample.java)
     * [BiFunction](Modern-Java-Examples/src/com/learn/functionalInterfaces/BiFunctionExample.java)
+    * [UnaryOperator](Modern-Java-Examples/src/com/learn/functionalInterfaces/UnaryOperatorExample.java)
+    * [BinaryOperator](Modern-Java-Examples/src/com/learn/functionalInterfaces/BinaryOperatorExample.java)