diff --git a/Area&CircumfrenceofCircle b/Area&CircumfrenceofCircle
new file mode 100644
index 0000000..2a96580
--- /dev/null
+++ b/Area&CircumfrenceofCircle
@@ -0,0 +1,19 @@
+import java.util.Scanner;
+class CircleDemo
+{
+   static Scanner sc = new Scanner(System.in);
+   public static void main(String args[])
+   {
+      System.out.print("Enter the radius: ");
+      /*We are storing the entered radius in double
+       * because a user can enter radius in decimals
+       */
+      double radius = sc.nextDouble();
+      //Area = PI*radius*radius
+      double area = Math.PI * (radius * radius);
+      System.out.println("The area of circle is: " + area);
+      //Circumference = 2*PI*radius
+      double circumference= Math.PI * 2*radius;
+      System.out.println( "The circumference of the circle is:"+circumference) ;
+   }
+}
diff --git a/CheckPrimeNumber b/CheckPrimeNumber
new file mode 100644
index 0000000..f7f0b9e
--- /dev/null
+++ b/CheckPrimeNumber
@@ -0,0 +1,19 @@
+public class PrimeExample{    
+ public static void main(String args[]){    
+  int i,m=0,flag=0;      
+  int n=3;//it is the number to be checked    
+  m=n/2;      
+  if(n==0||n==1){  
+   System.out.println(n+" is not prime number");      
+  }else{  
+   for(i=2;i<=m;i++){      
+    if(n%i==0){      
+     System.out.println(n+" is not prime number");      
+     flag=1;      
+     break;      
+    }      
+   }      
+   if(flag==0)  { System.out.println(n+" is prime number"); }  
+  }//end of else  
+}    
+}   
diff --git a/Factorial b/Factorial
new file mode 100644
index 0000000..6b6ee15
--- /dev/null
+++ b/Factorial
@@ -0,0 +1,13 @@
+//https://www.facebook.com/srishti.agrawal.714/posts/162113345582696
+//Subscribed by Srishti Agrawal
+public class Factorial
+{
+	public static void main(String[] args)
+	{
+		int n=Integer.parseInt(args[0]);
+		int f=1;
+		for(int i=1;i<=n;i++)
+			f*=i;
+		System.out.println("Factorial is "+ f);
+	}
+}
diff --git a/FactorialProgram b/FactorialProgram
new file mode 100644
index 0000000..335fbca
--- /dev/null
+++ b/FactorialProgram
@@ -0,0 +1,10 @@
+class FactorialExample{  
+ public static void main(String args[]){  
+  int i,fact=1;  
+  int number=5;//It is the number to calculate factorial    
+  for(i=1;i<=number;i++){    
+      fact=fact*i;    
+  }    
+  System.out.println("Factorial of "+number+" is: "+fact);    
+ }  
+}  
diff --git a/Fibonacci b/Fibonacci
new file mode 100644
index 0000000..52aa8eb
--- /dev/null
+++ b/Fibonacci
@@ -0,0 +1,19 @@
+public class FibonacciSeries {
+
+	public static void main(String[] args) {
+		printFibonacciSeries(10);
+	}
+
+	public static void printFibonacciSeries(int count) {
+		int a = 0;
+		int b = 1;
+		int c = 1;
+		for (int i = 1; i <= count; i++) {
+			System.out.print(a + ", ");
+			a = b;
+			b = c;
+			c = a + b;
+		}
+
+	}
+}
diff --git a/Fibonacci Series b/Fibonacci Series
new file mode 100644
index 0000000..e0f0779
--- /dev/null
+++ b/Fibonacci Series	
@@ -0,0 +1,17 @@
+public class Fibonacci {
+
+    public static void main(String[] args) {
+
+        int n = 10, t1 = 0, t2 = 1;
+        System.out.print("First " + n + " terms: ");
+
+        for (int i = 1; i <= n; ++i)
+        {
+            System.out.print(t1 + " + ");
+
+            int sum = t1 + t2;
+            t1 = t2;
+            t2 = sum;
+        }
+    }
+}
diff --git a/HelloWorld b/HelloWorld
new file mode 100644
index 0000000..e1a0fdb
--- /dev/null
+++ b/HelloWorld
@@ -0,0 +1,5 @@
+class HelloWorld {
+    public static void main(String[] args) {
+        System.out.println("Hello, World!"); 
+    }
+}
diff --git a/MyHelloWorld b/MyHelloWorld
new file mode 100644
index 0000000..e1a0fdb
--- /dev/null
+++ b/MyHelloWorld
@@ -0,0 +1,5 @@
+class HelloWorld {
+    public static void main(String[] args) {
+        System.out.println("Hello, World!"); 
+    }
+}
diff --git a/Palindrome b/Palindrome
new file mode 100644
index 0000000..00f167d
--- /dev/null
+++ b/Palindrome
@@ -0,0 +1,21 @@
+//https://www.facebook.com/srishti.agrawal.714/posts/162113345582696
+//Subscribed by Code House
+import java.util.Scanner; 
+class Palindrome {   
+ public static void main(String args[]) {  
+ Scanner input=new Scanner(System.in);
+  int rem,sum=0,rev;     
+  int n=input.nextInt();//It is the number variable to be checked for palindrome   
+  
+  rev=n;     
+  while(n>0) {     
+   rem=n%10;  //getting remainder   
+   sum=(sum*10)+rem;     
+   n=n/10;     
+  }     
+  if(rev==sum)     
+   System.out.println("It is a palindrome number ");     
+  else     
+   System.out.println("It is not a palindrome number");     
+}  
+}  
diff --git a/Reverse b/Reverse
new file mode 100644
index 0000000..bbaaa75
--- /dev/null
+++ b/Reverse
@@ -0,0 +1,21 @@
+public class JavaReverseString {
+
+	public static void main(String[] args) {
+		System.out.println(reverseString("abc"));
+		System.out.println(reverseString("123!@#098*"));
+	}
+
+	public static String reverseString(String in) {
+		if (in == null)
+			return null;
+		StringBuilder out = new StringBuilder();
+
+		int length = in.length();
+
+		for (int i = length - 1; i >= 0; i--) {
+			out.append(in.charAt(i));
+		}
+
+		return out.toString();
+	}
+}
diff --git a/complex_number.java b/complex_number.java
new file mode 100644
index 0000000..a4391fd
--- /dev/null
+++ b/complex_number.java
@@ -0,0 +1,31 @@
+#https://www.facebook.com/shruti.buchha.7/posts/3341900509242443
+#subscribed by shruti buchha
+import java.util.*;
+import java.lang.*;
+import java.io.*;
+public class ComplexNumber{
+   
+   double real, img;
+	
+   ComplexNumber(double r, double i){
+	this.real = r;
+	this.img = i;
+   }
+	
+   public static ComplexNumber sum(ComplexNumber c1, ComplexNumber c2)
+   {
+	
+        ComplexNumber temp = new ComplexNumber(0, 0);
+
+        temp.real = c1.real + c2.real;
+        temp.img = c1.img + c2.img;
+
+        return temp;
+    }
+    public static void main(String args[]) {
+	ComplexNumber c1 = new ComplexNumber(5.5, 4);
+	ComplexNumber c2 = new ComplexNumber(1.2, 3.5);
+        ComplexNumber temp = sum(c1, c2);
+        System.out.printf("Sum is: "+ temp.real+" + "+ temp.img +"i");
+    }
+}