Помогите понять, что требуется изменить
package com.javarush.task.task16.task1632;
import java.io.BufferedReader;
import java.io.IOException;
import java.io.InputStreamReader;
import java.util.ArrayList;
import java.util.List;
public class Solution {
public static List<Thread> threads = new ArrayList<>(5);
static {
threads.add(new Thread1());
threads.add(new Thread2());
threads.add(new Thread3());
threads.add(new Thread4());
threads.add(new Thread5());
}
public static void main(String[] args) {
}
public static class Thread1 extends Thread {
public void run() {
while(true){
}
}
}
public static class Thread2 extends Thread {
public void run() {
try{
while(true){
Thread.sleep(500);
}
}
catch (InterruptedException e) {
System.out.println("InterruptedException");
}
}
}
public static class Thread3 extends Thread {
public void run() {
while(true) {
try{
System.out.println("Ура");
Thread.sleep(500);
}
catch (Exception e) {
}
}
}
}
public static class Thread4 extends Thread implements Message {
public void run() {
while(!isInterrupted()){
showWarning();
if(isAlive()==true) {
System.out.println("Rjf");
}
}
}
public void showWarning () {
interrupt();
}
}
public static class Thread5 extends Thread {
public void run() {
BufferedReader r = new BufferedReader(new InputStreamReader(System.in));
int y = 0;
while(true) {
try {
String e = r.readLine();
if(e.equals("N")){
System.out.println(y);
break;
}
int a = Integer.parseInt(e);
y = y+a;
}
catch (Exception e) {
}
}
}
}
}