Some prompts how to do it ?
package pl.codegym.task.task16.task1629;
import java.io.BufferedReader;
import java.io.IOException;
import java.io.InputStreamReader;
public class Solution {
public static volatile BufferedReader reader = new BufferedReader(new InputStreamReader(System.in));
public static void main(String[] args) throws InterruptedException {
Read3Strings t1 = new Read3Strings();
Read3Strings t2 = new Read3Strings();
t1.start();
t1.join();
t2.start();
t2.join();
t1.printResult();
t2.printResult();
}
public static class Read3Strings extends Thread {
private static String s;
public static void printResult() {
System.out.println(s);
}
@Override
public void run() {
try {
s = reader.readLine();
s = new StringBuilder(s).append(" " + reader.readLine()).toString();
s = new StringBuilder(s).append(" " + reader.readLine()).toString();
} catch (IOException e) {
}
}
}
}