Java-8 Functions Composition

Author: Arpit Aggarwal

src/main/java/com/arpit/java8/function/FunctionComposition.java

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+package com.arpit.java8.function;
+
+import java.util.function.Function;
+
+public class FunctionComposition {
+
+	private Function<Integer, Integer> times2 = e -> e * 2;
+
+	private Function<Integer, Integer> squared = e -> e * e;
+
+	/**
+	 * Reference :
+	 * http://www.deadcoderising.com/2015-09-07-java-8-functional-composition-
+	 * using-compose-and-andthen/
+	 * 
+	 * @param args
+	 */
+	public static void main(String[] args) {
+		FunctionComposition obj = new FunctionComposition();
+		obj.run();
+
+	}
+
+	/**
+	 * While the compose function executes the caller last and the parameter
+	 * first, the andThen executes the caller first and the parameter last.
+	 */
+	private void run() {
+		int result = times2.compose(squared).apply(4); // Returns 32
+		System.out.println(result);
+		int result1 = times2.andThen(squared).apply(4); // Returns 64
+		System.out.println(result1);
+	}
+
+}