Pass user input from command line in java

There is a various way, you can pass parameter from a console . Using BufferdReader,InputStream but the easiest way to do it with Scanner class it took Inputstream(System.in) as parameter from we can get user given value

Let see an example



package com.example.userInput;

import java.util.Scanner;

public class UserInput {

    public void add(int i,int j)
    {
        int result = i+j;
        System.out.println("sum is " + result);
    }

    public void multiply(int i,int j)
    {
        int result = i*j;
        System.out.println("

Multiplication  is " + result);
   
    }

    public static void main(String[] args) {
   
        Scanner sc= new Scanner(System.in);
        System.out.println("Enter Choice either a or m");
        System.out.println("Enter First Operend");
        int op1 = sc.nextInt();
        System.out.println("Enter Second Operend");
        int op2 = sc.nextInt();
        System.out.println("Enter Choice");
        String choice = sc.next();
   
   
        UserInput input = new UserInput();
        if("a".equalsIgnoreCase(choice))
        {
            input.add(op1, op2);
        }
        else if("m".equalsIgnoreCase(choice))
        {
            input.multiply(op1, op2);
       
        }
        else
        {
            System.out.println("Wrong choice Entered");
        }