diff --git a/Java/Program-16/CSAOfCylinder.class b/Java/Program-16/CSAOfCylinder.class
new file mode 100644
index 00000000..faaea7ba
Binary files /dev/null and b/Java/Program-16/CSAOfCylinder.class differ
diff --git a/Java/Program-16/CSAOfCylinder.java b/Java/Program-16/CSAOfCylinder.java
new file mode 100644
index 00000000..3c2d563c
--- /dev/null
+++ b/Java/Program-16/CSAOfCylinder.java
@@ -0,0 +1,14 @@
+package com.dsa;
+
+import java.util.Scanner;
+
+public class CSAOfCylinder {
+    public static void main(String[] args) {
+        Scanner input=new Scanner(System.in);
+        System.out.println("Enter radius and height of cylinder");
+        float radius=input.nextFloat();
+        float height=input.nextFloat();
+        float CSA=2*3.14f*radius*height;
+        System.out.println("Curved surface area of cylinder is "+CSA+" square units");
+    }
+}
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diff --git a/Java/Program-16/README.md b/Java/Program-16/README.md
new file mode 100644
index 00000000..42d29ac9
--- /dev/null
+++ b/Java/Program-16/README.md
@@ -0,0 +1,3 @@
+Program 16
+
+Program to find CSA of Cylinder
\ No newline at end of file
diff --git a/Java/Program-17/ReverseString.java b/Java/Program-17/ReverseString.java
new file mode 100644
index 00000000..a9cabfbe
--- /dev/null
+++ b/Java/Program-17/ReverseString.java
@@ -0,0 +1,17 @@
+package com.dsa;
+
+import java.util.Scanner;
+
+public class ReverseString {
+    public static void main(String[] args) {
+        Scanner input=new Scanner(System.in);
+        String reversed_string="";
+        System.out.println("Enter the string");
+        String string= input.next();
+        for(int i=string.length()-1;i>=0;i--){
+            reversed_string = reversed_string + string.charAt(i);
+        }
+        System.out.println("The original string is "+string);
+        System.out.println("The reversed string is "+reversed_string);
+    }
+}
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diff --git a/Java/Program-17/readme.md b/Java/Program-17/readme.md
new file mode 100644
index 00000000..fa231970
--- /dev/null
+++ b/Java/Program-17/readme.md
@@ -0,0 +1,3 @@
+Program 17 
+
+Program to reverse a given string
diff --git a/Java/Program-18/ElectricityBill.java b/Java/Program-18/ElectricityBill.java
new file mode 100644
index 00000000..64823e3f
--- /dev/null
+++ b/Java/Program-18/ElectricityBill.java
@@ -0,0 +1,18 @@
+//A consumer consumes n watts per hour daily for one month.
+// Calculate the total energy bill of that consumer if per-unit rate is 7?
+// ( In $, £, €, INR, DHR, Riyal etc.) [Take 1 month = 30 Days].
+package com.dsa;
+
+import java.util.Scanner;
+
+public class ElectricityBill {
+    public static void main(String[] args) {
+        Scanner input=new Scanner(System.in);
+        System.out.println("Enter the watts consumed per hour");
+        int watts=input.nextInt();
+        int electricity=watts*24*30;//Total watts of electricity consumed in 30 days
+        int cost=(electricity/1000)*7;//We divide by 1000 to convert watts to kilo-watts
+        //One unit=One kilo-watt and One unit costs 7
+        System.out.println("The electricity bill is "+cost);
+    }
+}
diff --git a/Java/Program-18/readme.md b/Java/Program-18/readme.md
new file mode 100644
index 00000000..250559c3
--- /dev/null
+++ b/Java/Program-18/readme.md
@@ -0,0 +1,3 @@
+Program-18 
+
+Program to calculate electricity bill
\ No newline at end of file
diff --git a/Java/Program-19/Discount.java b/Java/Program-19/Discount.java
new file mode 100644
index 00000000..a8683a8b
--- /dev/null
+++ b/Java/Program-19/Discount.java
@@ -0,0 +1,17 @@
+package com.dsa;
+
+import java.util.Scanner;
+
+public class Discount {
+    public static void main(String[] args) {
+        Scanner input=new Scanner(System.in);
+        System.out.println("Enter the original price of product");
+        int original_price=input.nextInt();
+        System.out.println("Enter the discount percentage");
+        float discount=input.nextInt();
+        float discount_price=original_price*(discount/100);
+        float final_price=original_price-discount_price;
+        System.out.println("The discount price is: "+discount_price);
+        System.out.println("The final price after discount is: "+final_price);
+    }
+}
diff --git a/Java/Program-19/readme.md b/Java/Program-19/readme.md
new file mode 100644
index 00000000..a6d73f91
--- /dev/null
+++ b/Java/Program-19/readme.md
@@ -0,0 +1,3 @@
+Program 19
+
+Program to calculate discount
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