Question

Develop a java program using multithreading in which each thread reads data from two separate input text files and display each line of data from each file on the Console alternatively such that one line from the first input file is printed and then one line from the other input file is printed etc.

Answer 1

Answer:

Here is the code to read the 2 files in 2 separate threads and print each line from the file. You cannot have control on the threads during execution. You will always see different O/Ps on the console, as the execution part is handled by the JVM. I hope the below code helps, do comment if you have any questions.

If /usr/lib/jvm/java-8-oracle/bin/java ... The thread - 1The thread -2 David Webb Box 34 Rural route 2 Nixa MO 65714 (417)555-1478 XXX-XX-XXXX 09-13-1970 : thread 1 Martha Kent 1122 North Hwy 5 Samllville KS 66789 (785)555-2322 XXX-XX-XXXX 04-17-1965 : thread i David Webb Box 34 Rural route 2 Nixa MO 65714 (417)555-1478 5 09-13-1970 Sunday13, September, 1970 : thread 2 Martha Kent 1122 North Hwy 5 Samllville KS 66789 (785)555-2322 3 04-17-1965 Saturday17, April, 1965 : thread 2 Edward Nygma 443 W. Broadway Gotham City NJ 12458 (212)743-3537 7 08-08-1987 Saturday08, August, 1987 : thread 2 Edward Nygma 443 W.Broadway Gotham City NJ 12458 (212)743-3537 XXX -XX-XXXX 08-08-1987 : thread 1 I b Process finished with exit code a

MultiThreadFileRead.java

import java.io.File;
import java.io.FileNotFoundException;
import java.util.Scanner;

public class MultiThreadFileRead {

    public static void main(String[] args) throws InterruptedException {

        Thread thread1 = new Thread(new Runnable() { // creating thread 1
            public void run() {
                System.out.print("The thread - 1");
                try {
                    Scanner sc1 = new Scanner(new File("src/main/java/copy_customers_and_contacts.txt"));
                    while(sc1.hasNextLine()){

                        System.out.println(sc1.nextLine() + " : thread 1");
                    }
                } catch (FileNotFoundException e) {
                    e.printStackTrace();
                }
            }
        });

        Thread thread2 = new Thread(new Runnable() { // creating thread - 2
            @Override
            public void run() {
                System.out.println("The thread -2");
                try {
                    Scanner sc1 = new Scanner(new File("src/main/java/customers_and_contacts.txt"));
                    while(sc1.hasNextLine()){
                        System.out.println(sc1.nextLine() + " : thread 2");
                    }
                } catch (FileNotFoundException e) {
                    e.printStackTrace();
                }
            }
        });
        
        thread1.start();
        thread2.start();

    }

}

Thank you, Good Luck!!!