How to make a program in java in which you can input 3 variables/3 numbers and input all the operations that'll serve as calcu?

Question

Input 3 numbers on the output example:
Enter 1st no. (type any no. e.g)
5
Enter 2nd no. (type any no. e.g)
5
Enter 3rd no. (type any no. e.g)
5
The sum of the 3 no. is (the program will automatically solve it)
15
Addition, Subtraction, Multiplication and Division must be on the same program. All the operations must be on one program. Like a CALCULATOR.
What would be the Input/codes for that?
Please help me. For educational purpose only. I really need to know how. Please share your knowledge to me. Thank you

Answer 1

java uses Scanner class to get input from user but you must import it
import java.util.Scanner;
Scanner s = new Scanner(System.in);

Answer 2

https://code.sololearn.com/cf64qi9Bthde/?ref=app
take a look