diff --git a/src/main/java/com/coveros/demo/helloworld/Calculator.java b/src/main/java/com/coveros/demo/helloworld/Calculator.java
new file mode 100644
index 00000000..bae5ef6a
--- /dev/null
+++ b/src/main/java/com/coveros/demo/helloworld/Calculator.java
@@ -0,0 +1,21 @@
+package com.coveros.demo.helloworld;
+public class Calculator {
+    public int add(int a, int b) {
+        return a + b;
+    }
+    public int subtract(int a, int b) {
+        return a - b;
+    }
+    public int multiply(int a, int b) {
+        return a * b;   
+    }
+    public int divide(int a, int b) {
+        if (b == 0) {
+            throw new IllegalArgumentException("Division by zero is not allowed.");
+        }
+        return (double)a / b;
+    }
+    public int modulus(int a, int b) {
+        return a % b;
+    }
+}
diff --git a/src/main/java/com/coveros/demo/helloworld/Student.java b/src/main/java/com/coveros/demo/helloworld/Student.java
new file mode 100644
index 00000000..e29161fb
--- /dev/null
+++ b/src/main/java/com/coveros/demo/helloworld/Student.java
@@ -0,0 +1,21 @@
+package com.coveros.demo.helloworld;
+public class Student{
+    private String name;
+    private int roll;
+    public Student(String name, int roll) {
+        this.name = name;
+        this.roll = roll;
+    }
+    public String getName() {
+        return name;
+    }
+    public void setName(String name) {
+        this.name = name;
+    }
+    public int getRoll() {
+        return roll;
+    }
+    public void setRoll(int roll) {
+        this.roll = roll;
+    }
+}
\ No newline at end of file