Check out example codes for "system.in example in java". It will help you in understanding the concepts better.

Code Example 1

package com.mkyong.io;

import java.util.Scanner;

public class JavaScanner {

    public static void main(String[] args) {

        Scanner scanner = new Scanner(System.in);

        String input = "";
        while (!"q".equalsIgnoreCase(input)) {

            System.out.print("Enter something (q to quite): ");

            input = scanner.nextLine();
            System.out.println("input : " + input);
        }

        System.out.println("bye bye!");
    }

}

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