Java simple calculator

This is how to create a simple calculator using java.

Link to download JDK

http://allinone-nsr.blogspot.com/p/jdk.html

The code:

import java.util.Scanner; //imports scanner to get user input
class cal{ //this is the class file name and it should match the file name that we given to save the file

public static void main(String[] args){ //this is the main method

int total=0; //declare a variable for get total
System.out.println("Enter Number 1:-"); //display this
Scanner a = new Scanner(System.in); //create a new user input and name it a
int num1=a.nextInt(); //declare a variable name num1 and get the value of user input

System.out.println("Enter Number 2:-"); //display this
Scanner b = new Scanner(System.in); //create a new user input and name it b
int num2=b.nextInt(); //declare a variable name num2 and get the value of user input

System.out.println("Enter Mark:-"); //display this
Scanner c = new Scanner(System.in); //create a new user input and name it c
String choise=b.next(); //declare a variable name choise and get the value of user input

switch (choise){ //checks the inputs of choise variable

case ("+"): //if input equals +
total=num1+num2; //pass the addition of num1 and num2 into variable total
break; //finish the statement
case "-": //if input equals -
total=num1-num2; //pass the sub of num1 and num2 into variable total
break; //finish the statement
case "/": //if input equals /
total=num1/num2; //pass the division of num1 and num2 into variable total
break; //finish the statement
case "x": //if input equals x
total=num1*num2; //pass the multipication of num1 and num2 into variable total
break; //finish the statement
default: //if input equals anything else
System.out.println("Choose +,-,x,/"); //display this
break; //finish the statement
}
System.out.println("Total = "+total); //display Total = and value of total variable } }