10871 X보다 작은 수

* BufferedReader, StringBuilder, StringTokenizer

import java.io.*;
import java.util.StringTokenizer;

public class Main {
	public static void main(String[] args) throws Exception {
		BufferedReader br = new BufferedReader(new InputStreamReader(System.in));
		String line = br.readLine();
		String nums = br.readLine();
		br.close();
		
		StringTokenizer token = new StringTokenizer(line);
		int n = Integer.parseInt(token.nextToken());
		int x = Integer.parseInt(token.nextToken());
		
		StringTokenizer tokenN = new StringTokenizer(nums);
		StringBuilder sb = new StringBuilder();

		for(int i=0; i<n; i++) {
			int value = Integer.parseInt(tokenN.nextToken());
			if(value < x) {
				sb.append(value);
				sb.append(" ");
			}
		}
		System.out.println(sb);
	}
}

배열을 사용하는 방법 ( 위 코드보다 3배 느림 )

* Scanner

import java.util.Scanner;
 
public class Main {
	public static void main(String[] args) {
		Scanner in = new Scanner(System.in);
 
		int N = in.nextInt();
		int X = in.nextInt();
		int arr[] = new int[N];
        
		for (int i = 0; i < N; i++) {
			arr[i] = in.nextInt();
		}
 
		in.close();
        
		for (int i = 0; i < N; i++) {
			if (arr[i] < X) {
				System.out.print(arr[i] + " ");
			}
		}
	}
}