diff --git a/Java/Factorial.java b/Java/Factorial.java
new file mode 100644
index 0000000..b7914fe
--- /dev/null
+++ b/Java/Factorial.java
@@ -0,0 +1,16 @@
+import java.util.*;
+public class Factorial {
+	public static void main(String args[])
+	{
+	Scanner sc=new Scanner(System.in);
+	int n,i,fact=1;
+	System.out.println("Enter a number:");
+	n=sc.nextInt();
+	for(i=1;i<=n;i++)
+	{
+		fact=fact*i;
+	}
+	System.out.println("Factorial:"+fact);
+	}
+
+}
diff --git a/Java/QueueUsingStack.java b/Java/QueueUsingStack.java
new file mode 100644
index 0000000..ca9e4b2
--- /dev/null
+++ b/Java/QueueUsingStack.java
@@ -0,0 +1,59 @@
+import java.util.*; 
+  
+class QueueUsingStack  
+{  
+static class Queue  
+{  
+    static Stack<Integer> s1 = new Stack<Integer>();  
+    static Stack<Integer> s2 = new Stack<Integer>();  
+  
+    static void enQueue(int x)  
+    {  
+        // Move all elements from s1 to s2  
+        while (!s1.isEmpty()) 
+        {  
+            s2.push(s1.pop());  
+            //s1.pop();  
+        }  
+  
+        // Push item into s1  
+        s1.push(x);  
+  
+        // Push everything back to s1  
+        while (!s2.isEmpty())  
+        {  
+            s1.push(s2.pop());  
+            //s2.pop();  
+        }  
+    }  
+  
+    // Dequeue an item from the queue  
+    static int deQueue()  
+    {  
+        // if first stack is empty  
+        if (s1.isEmpty())  
+        {  
+            System.out.println("Q is Empty");  
+            System.exit(0);  
+        }  
+  
+        // Return top of s1  
+        int x = s1.peek();  
+        s1.pop();  
+        return x;  
+    }  
+};  
+  
+// Driver code  
+public static void main(String[] args)  
+{  
+    Queue q = new Queue();  
+    q.enQueue(1);  
+    q.enQueue(2);  
+    q.enQueue(3);  
+  
+    System.out.println(q.deQueue());  
+    System.out.println(q.deQueue()); 
+    System.out.println(q.deQueue()); 
+}  
+}  
\ No newline at end of file