Abstract

In the following I will describe how to read the input in Java. We will examine the Scanner class and then write our own class for faster input reading.

Using the Scanner class

We can read the input using the Scanner class:

import java.util.*;

public class Main{ public static void main(String[] args) { // Use the Scanner class Scanner sc = new Scanner(System.in);
/* int n = sc.nextInt(); // read input as integer long k = sc.nextLong(); // read input as long double d = sc.nextDouble(); // read input as double String str = sc.next(); // read input as String String s = sc.nextLine(); // read whole line as String */ } } Using the BufferedReader class

However, the Scanner class is slow and may cause a "timelimit exceeded". We can read the input faster with the BufferedReader class. The class "MyScanner" below uses a BufferedReader. The same method names as in the Scanner class have been chosen, e.g. to read the input as an integer we still can use nextInt().

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

public class Main{ public static void main(String[] args) { MyScanner sc = new MyScanner(); out = new PrintWriter(new BufferedOutputStream(System.out));

// Start writing your solution here. -------------------------------------

  /*
  int n      = sc.nextInt();        // read input as integer
  long k     = sc.nextLong();       // read input as long
  double d   = sc.nextDouble();     // read input as double
  String str = sc.next();           // read input as String
  String s   = sc.nextLine();       // read whole line as String

  int result = 3*n;
  out.println(result);                    // print via PrintWriter
  */

  // Stop writing your solution here. -------------------------------------
  out.close();

}

//-----------PrintWriter for faster output--------------------------------- public static PrintWriter out;

//-----------MyScanner class for faster input---------- public static class MyScanner { BufferedReader br; StringTokenizer st;

public MyScanner() {
     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;
  }

} //-------------------------------------------------------- } References

FastScanner class used by xenoslash.

Faster input for java – An article by James Brucker

ReadLine in Java

If you know of a simpler/better method for input reading in Java, please post it below.

Edit 1 (30 August 2014)

I added PrintWriter for a faster output.

Thanks for reading and comments.