here

Calculator.java

@@ -0,0 +1,12 @@
+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 ArithmeticException("Invalid operation ");
+
+
+        return a / b;
+    }
+}

j.java

@@ -0,0 +1 @@
+#wer

student.java

@@ -0,0 +1,21 @@
+public class student {
+    private String name;
+    private int age;
+    public Student(String name, int age) {
+        this.name = name;
+        this.age = age;
+    }
+    public String getName() { 
+        return name; 
+        }
+    public int getAge() { 
+        return age; 
+        }
+
+    public void setName(String name) { 
+        this.name = name; 
+        }
+    public void setAge(int age) {
+         this.age = age; 
+         }
+}