Collate sequence length in Java

Collatz.java

public class Collatz {
  private static int count_until_1(long n) {
      int count = 0;
      while(n != 1) {
          if(n % 2 == 0) {
              n /= 2;
          } else {
              n = (n * 3) + 1;
          }
          count++;
      }
      return count;
  }

  public static void main(String[] args){
      long i, length, number;
      length = 0;
      number = 0;
      for(i = 1; i < 300000; i++) {
          long l = count_until_1(i);
          if(length < l) {
              length = l;
              number = i;
          }
      }
      
      System.out.println("Maximum stopping distance " + length + ", starting number " + number);
  }
}