Merge pull request #39 from amitrp/aph-15311_difference_between_two_Sets

aph-15311 difference between two Sets

Author: amitrp

README.md

@@ -119,6 +119,8 @@ This project contains Core Java code samples that are used as examples on [amitp
 
 ### [Comparing Two Lists In Java](https://www.amitph.com/java-compare-lists/)
 
+###[Finding the Difference Between Two Java Sets](https://www.amitph.com/java-find-sets-difference/)
+
 
 ## How to use
 *Clone the project using*

java-collections/README.md

@@ -82,6 +82,9 @@ This project contains Java Collections code samples that are used as examples on
 
 ### [Comparing Two Lists In Java](https://www.amitph.com/java-compare-lists/)
 
+###[Finding the Difference Between Two Java Sets](https://www.amitph.com/java-find-sets-difference/)
+
+
 ## How to use
 *Clone the project using*
 ```

java-collections/src/main/java/com/amitph/java/collections/set/SetsDifferenceFinder.java

@@ -0,0 +1,65 @@
+package com.amitph.java.collections.set;
+
+import com.google.common.collect.Sets;
+import org.apache.commons.collections4.CollectionUtils;
+
+import java.util.HashSet;
+import java.util.Set;
+import java.util.stream.Collectors;
+
+public class SetsDifferenceFinder {
+    private final Set<String> one = Set.of("Ray", "Tim", "Leo", "Bee");
+    private final Set<String> two = Set.of("Ray", "Mia", "Lyn", "Bee", "Zoe");
+
+    public void usingPlainJava() {
+        Set<String> difference = new HashSet<>(one);
+        difference.removeAll(two);
+
+        System.out.println(difference);
+    }
+
+    public void usingStreams() {
+        Set<String> difference = one.stream()
+                .filter(e -> !two.contains(e))
+                .collect(Collectors.toSet());
+        System.out.println(difference);
+    }
+
+    public void usingApacheCommons() {
+        Set<String> differences = new HashSet<>(CollectionUtils.removeAll(one, two));
+        System.out.println(differences);
+    }
+
+    public void usingGuava() {
+        Set<String> differences = Sets.difference(one, two);
+        System.out.println(differences);
+    }
+
+    public void symmetricDifferenceUsingApacheCommons(){
+        Set<String> differences = new HashSet<>(CollectionUtils.disjunction(one, two));
+        System.out.println(differences);
+    }
+
+    public static void main(String[] a) {
+        SetsDifferenceFinder differenceFinder = new SetsDifferenceFinder();
+
+        System.out.println("Plain Java:");
+        differenceFinder.usingPlainJava();
+
+        System.out.println();
+        System.out.println("Java Streams:");
+        differenceFinder.usingStreams();
+
+        System.out.println();
+        System.out.println("Apache Commons Collection:");
+        differenceFinder.usingApacheCommons();
+
+        System.out.println();
+        System.out.println("Guava:");
+        differenceFinder.usingGuava();
+
+        System.out.println();
+        System.out.println("Symmetric Difference with Apache Commons Collection:");
+        differenceFinder.symmetricDifferenceUsingApacheCommons();
+    }
+}