Create GenericMethodEx.java

janbodnar · web-flow · commit 965f8c9ea2ad · 2018-04-26T08:18:07.000+02:00
diff --git a/generics/GenericMethodEx.java b/generics/GenericMethodEx.java
@@ -0,0 +1,33 @@
+package com.zetcode;
+
+import java.util.HashSet;
+import java.util.Set;
+
+public class GenericMethodEx {
+
+    public static void main(String[] args) {
+        
+        Set<String> words = new HashSet<>();
+        words.add("blue");
+        words.add("pen");
+        words.add("dog");
+        words.add("narrow");
+        
+        Set<String> words2 = new HashSet<>();
+        words.add("blue");
+        words.add("pencil");
+        words.add("forest");
+        words.add("narrow");
+        
+        Set<String> res = union(words, words2);
+        System.out.println(res);
+    }
+    
+    public static <E> Set<E> union(Set<E> s1, Set<E> s2) {
+        
+        Set<E> result = new HashSet<>(s1);
+        result.addAll(s2);
+        
+        return result;
+    }
+}
