=> Make Calculator in Java.
--------------------------------------------------
import java.util.Scanner;

public class Calculator {
 public static void main(String[] args) {

 int a,b, res;
 char choice, ch;

 Scanner sc=new Scanner(System.in);

 System.out.println("Here are our option");
 System.out.println("1. Addition");
 System.out.println("2. Subtraction");
 System.out.println("3. Division");
 System.out.println("4. Multiplication");

 System.out.println("Enter your choice");

 choice=sc.next().charAt(0);

 switch(choice)
 {
 case '1': System.out.println("Enter any two number");
 a=sc.nextInt();
 b=sc.nextInt();
 res=a+b;
 System.out.println("Your Result is="+" "+res);
 break;

 case '2': System.out.println("Enter any two number");
 a=sc.nextInt();
 b=sc.nextInt();
 res=a-b;
 System.out.println("Your Result is="+" "+res);
 break;

 case '3': System.out.println("Enter any two number");
 a=sc.nextInt();
 b=sc.nextInt();
 res=a/b;
 System.out.println("Your Result is="+" "+res);
 break;

 case '4': System.out.println("Enter any two number");
 a=sc.nextInt();
 b=sc.nextInt();
 res=a*b;
 System.out.println("Your Result is="+" "+res);
 break;
 }
 System.out.println("------------------------------------------");

 }
}

-----------------------------------------------------------------------------------
When the above Java Program is compile and executed, it will produce the following output: