I'm adding a calculator program using Java

DO_A1.java

@@ -0,0 +1,46 @@
+import java.util.Scanner;
+
+public class DO_A1 {
+
+    int add(int a, int b) {
+        return a + b;
+    }
+
+    int sub(int a, int b) {
+        return a - b;
+    }
+
+    int mult(int a, int b) {
+        return a * b;
+    }
+
+    float div(int a, int b) {
+        return a / b;
+    }
+
+    public static void main(String[] args) {
+        try (Scanner sc = new Scanner(System.in)) {
+            int a, b, ad, s, m, ch;
+            a = sc.nextInt();
+            b = sc.nextInt();
+            float d;
+            System.out
+                    .println("Enter choice as 1 for sum, 2 for subtraction, 3 for multiplication and 4 for division:");
+            ch = sc.nextInt();
+            Calculator c = new Calculator();
+            if (ch == 1) {
+                ad = c.add(a, b);
+                System.out.println(ad);
+            } else if (ch == 2) {
+                s = c.sub(a, b);
+                System.out.println(s);
+            } else if (ch == 3) {
+                m = c.mult(a, b);
+                System.out.println(m);
+            } else if (ch == 4) {
+                d = c.div(a, b);
+                System.out.println(d);
+            }
+        }
+    }
+}