Java User Input and Difference between readInt and nextInt?

Question

What is wrong with this?

import java.io.*;

class TUI{

    public static void main(String[] args) {

        System.out.println(\"Enter the two numbers:\");
            


        

Answer 1

You need something like a scanner to read-in values from console. The code should look like that:

import java.util.Scanner;

class TUI {
    public static void main(String[] args) {
        Scanner scanner = new Scanner(System.in);
        System.out.println("Enter the two numbers:");
        System.out.println("Enter n1:");
        int n1 = scanner.nextInt();
        System.out.println("Enter n2:");
        int n2 = scanner.nextInt();
        int total = n1 + n2;
        System.out.println("Total is =" + total + ".");
        scanner.close();
    }
}

I hope it helps.

Answer 2

readInt is used with datainputstream class. nextInt with scanner class and you need to create a scanner object inorder to get input values. i.e

java.util.Scanner obj=new java.util.Scanner(System.in);
      int x=obj.nextInt();

Objective of both is the same to read integer values.