modified inbuilt classes to take user inputs efficiently

Author: NirmalSilwal

Codeforces/TakingUserInputPractice.java

@@ -0,0 +1,68 @@
+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());
+
+	}
+
+	// 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 s = "";
+			try {
+				s = br.readLine();
+			} catch (IOException e) {
+				e.printStackTrace();
+			}
+			return s;
+		}
+	}
+}