diff --git a/TreeSet18a.java b/TreeSet18a.java
new file mode 100644
index 0000000..ac5e2a6
--- /dev/null
+++ b/TreeSet18a.java
@@ -0,0 +1,19 @@
+//18a. write a java code to demonstrate tree set
+import java.util.*;
+public class TreeSet18a
+{
+	public static void main(String[] args)
+	{
+		TreeSet<String> brands = new TreeSet<String>();
+		brands.add("YSL");
+		brands.add("Prada");
+		brands.add("Louboutin");
+		brands.add("Maybellin");
+		brands.add("YSL");
+		Iterator<String> itr = brands.iterator();
+		while(itr.hasNext())
+		{
+			System.out.println(itr.next());
+		}
+	}
+}
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diff --git a/TreeSet18b.java b/TreeSet18b.java
new file mode 100644
index 0000000..c8d3a4f
--- /dev/null
+++ b/TreeSet18b.java
@@ -0,0 +1,19 @@
+//18b. write a java code to demonstrate tree set
+import java.util.*;
+public class TreeSet18b
+{
+	public static void main(String[] args)
+	{
+		TreeSet<String> brands = new TreeSet<String>();
+		brands.add("YSL");
+		brands.add("Prada");
+		brands.add("Louboutin");
+		brands.add("null");
+		brands.add("YSL");
+		Iterator<String> itr = brands.iterator();
+		while(itr.hasNext())
+		{
+			System.out.println(itr.next());
+		}
+	}
+}
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diff --git a/Vector14a.java b/Vector14a.java
new file mode 100644
index 0000000..c14da91
--- /dev/null
+++ b/Vector14a.java
@@ -0,0 +1,18 @@
+//14(a). write a java code to demonstrate vector
+import java.util.*;
+public class Vector14a
+{
+	public static void main(String[] args)
+	{
+		Vector<String> name=new Vector<String>();
+		name.add("Misa");
+		name.add("Aditya");
+		name.add("Shyam");
+		name.add("Aisha");
+		Iterator<String> itr=name.iterator();
+		while(itr.hasNext())
+		{
+			System.out.println(itr.next());
+		}
+	}
+}
diff --git a/Vector14b.java b/Vector14b.java
new file mode 100644
index 0000000..456602d
--- /dev/null
+++ b/Vector14b.java
@@ -0,0 +1,21 @@
+import java.util.Vector;
+public class Vector14b {
+	public static void main(String args[]){
+		Vector<String> groceryList = new Vector<String>();
+		groceryList.add("Bread");
+		groceryList.add("Milk");
+		groceryList.add("Eggs");
+		
+		System.out.println("Item at index 0: " + groceryList.get(0));
+		System.out.println("Item at index 1: " + groceryList.get(1));
+		System.out.println("Item at index 2: " + groceryList.get(2));
+	
+		System.out.println("Items in Grocery list: ");
+		for(String item: groceryList) {
+			System.out.println(item);
+		}
+		
+		itemList.remove(groceryList.get(2));
+		System.out.println("Size of grocery after removal: " + groceryList.size());
+	}
+}
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