TakingUserInputPractice.java

package virtualContest;

import java.io.BufferedReader;
import java.io.InputStreamReader;
import java.io.IOException;
import java.util.StringTokenizer;
import java.util.Scanner;

public class TakingUserInputPractice {

	public static void main(String[] args) throws IOException {

		// approach 1 - using Scanner class
		Scanner sc = new Scanner(System.in);
		int num = sc.nextInt();

		// approach 2 - using BufferedReader class
		BufferedReader br = new BufferedReader(new InputStreamReader(System.in));
		StringTokenizer st = new StringTokenizer(br.readLine());

		int n = Integer.parseInt(st.nextToken());

		FastReader s = new FastReader();
		int number = s.nextInt();
		System.out.println(number);
	}

	// approach 3 - using BufferedReader and StringTokenizer with user defined
	// methods
	static class FastReader {
		BufferedReader br;
		StringTokenizer st;

		public FastReader() {
			br = new BufferedReader(new InputStreamReader(System.in));
		}

		String next() {
			while (st == null || !st.hasMoreElements()) {
				try {
					st = new StringTokenizer(br.readLine());
				} catch (IOException e) {
					e.printStackTrace();
				}
			}
			return st.nextToken();
		}

		int nextInt() {
			return Integer.parseInt(next());
		}

		long nextLong() {
			return Long.parseLong(next());
		}

		double nextDouble() {
			return Double.parseDouble(next());
		}

		String nextLine() {
			String str = "";
			try {
				str = br.readLine();
			} catch (IOException e) {
				e.printStackTrace();
			}
			return str;
		}
	}
}