BAEL-4959 iterating over the Set (#10864)

java-collections-conversions-2/pom.xml

@@ -44,6 +44,12 @@
             <version>${hamcrest.version}</version>
             <scope>test</scope>
         </dependency>
+        <dependency>
+            <groupId>io.vavr</groupId>
+            <artifactId>vavr</artifactId>
+            <version>0.10.3</version>
+        </dependency>
+
     </dependencies>
 
     <build>

java-collections-conversions-2/src/test/java/com/baeldung/setiteration/SetIteration.java

@@ -0,0 +1,74 @@
+package com.baeldung.setiteration;
+
+import com.google.common.collect.Sets;
+import io.vavr.collection.Stream;
+import org.junit.jupiter.api.Test;
+
+import java.util.Iterator;
+import java.util.Set;
+import java.util.stream.Collectors;
+
+class SetIteration {
+
+    @Test
+    void givenSet_whenIteratorUsed_shouldIterateOverElements() {
+        // given
+        Set<String> names = Sets.newHashSet("Tom", "Jane", "Karen");
+
+        // when
+        Iterator<String> namesIterator1 = names.iterator();
+        Iterator<String> namesIterator2 = names.iterator();
+
+        // then
+        namesIterator1.forEachRemaining(System.out::println);
+        while(namesIterator2.hasNext()) {
+            System.out.println(namesIterator2.next());
+        }
+    }
+
+    @Test
+    void givenSet_whenStreamUsed_shouldIterateOverElements() {
+        // given
+        Set<String> names = Sets.newHashSet("Tom", "Jane", "Karen");
+
+        // when & then
+        String namesJoined = names.stream()
+                .map(String::toUpperCase)
+                .peek(System.out::println)
+                .collect(Collectors.joining());
+    }
+
+    @Test
+    void givenSet_whenEnhancedLoopUsed_shouldIterateOverElements() {
+        // given
+        Set<String> names = Sets.newHashSet("Tom", "Jane", "Karen");
+
+        // when & then
+        for (String name : names) {
+            System.out.println(name);
+        }
+    }
+
+    @Test
+    void givenSet_whenMappedToArray_shouldIterateOverElements() {
+        // given
+        Set<String> names = Sets.newHashSet("Tom", "Jane", "Karen");
+
+        // when & then
+        Object[] namesArray = names.toArray();
+        for (int i = 0; i < namesArray.length; i++) {
+            System.out.println(i + ": " + namesArray[i]);
+        }
+    }
+
+    @Test
+    void givenSet_whenZippedWithIndex_shouldIterateOverElements() {
+        // given
+        Set<String> names = Sets.newHashSet("Tom", "Jane", "Karen");
+
+        // when & then
+        Stream.ofAll(names)
+                .zipWithIndex()
+                .forEach(t -> System.out.println(t._2() + ": " + t._1()));
+    }
+}