add set test

Author: junho85

src/main/java/set/SetTest.java

@@ -0,0 +1,21 @@
+package set;
+
+import com.google.common.collect.Sets;
+
+import java.util.Set;
+
+public class SetTest {
+    public static void main(String[] args) {
+        Set<String> sets = Sets.newHashSet();
+
+        sets.add(null);
+        sets.add(null);
+        sets.add("hello");
+        sets.add("hello");
+        sets.add("hello2");
+
+        for (String set : sets) {
+            System.out.println(set);
+        }
+    }
+}