Add files via upload

Author: AvinandanBose

Diff for: setDemo1.java

@@ -0,0 +1,19 @@
+import java.util.Set;
+import java.util.TreeSet;
+
+public class setDemo1 {
+
+    Set<String> set =  new TreeSet<>(); 
+
+    public static void main(String[] args) {
+        setDemo1 setDemo1 = new setDemo1();
+        setDemo1.set.add("A");
+        setDemo1.set.add("a");
+        setDemo1.set.add("B");
+        setDemo1.set.add("b");
+        System.out.println(setDemo1.set);
+    }
+
+
+    
+}