khan5v

// To join list of srings on a delimiter
List<String> l = new ArrayList<>();
String.join("+", l);

// To split based on control character
String[] strings = br.readLine().split("\\+");

khan5v

public class Utils {

    public static long mulmod(long a, long b, long mod) {
        return (a * b) % mod;
    }

    public static long binpow(long a, long pow, long mod) {
        if (pow == 0)
            return 1;
        long res = binpow(a, pow / 2, mod);

khan5v

public static void main(String[] args) throws IOException {
  BufferedReader br = new BufferedReader(new FileReader("PATH1"));
  int T = Integer.parseInt(br.readLine());
  PrintWriter writer = new PrintWriter("PATH2", "UTF-8");
  writer.println("Line");
  writer.close();
}

khan5v

import java.util.*;

public class Scheduler {
  public static void main(String[] args) {
    private final ScheduledExecutorService scheduler = Executors.newScheduledThreadPool(1);
    final Runnable ticker = new Runnable() {
      public void run() {
        System.out.println("Ran");
      }
    };