Answer / core

import java.util.Scanner;

public class InfiniteThread extends Thread {

public void run() {
while (true) {
System.out.println("hi");
try {
this.sleep(1000);
} catch (InterruptedException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
}
}

public static void main(String[] args) throws InterruptedException {
new ExitThread().start();
new InfiniteThread().start();
}
}
class ExitThread extends Thread{
@Override
public void run() {
Scanner scan = new Scanner(System.in);
String next = scan.nextLine();
if(next.equals(""))
System.exit(0);
super.run();
}
}

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