Programming Forums > Application Development > Java

truBlu · Oct 29th, 2007, 10:26 PM

Do I need the following lines of code when I want to input whole lines of text? If so, why do I need them? I found this code on the internet but I'm unsure of the purpose behind it. I tried google searching for the answer but came up short.

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InputStreamReader converter = new InputStreamReader(System.in);
BufferedReader input = new BufferedReader(converter);            
String word = input.readLine();

titaniumdecoy · Oct 29th, 2007, 10:53 PM

That is one way to read standard input. A better way is to use a Scanner:

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Scanner sc = new Scanner(System.in);

You can use the nextLine() method to read an entire line, or next() to read the next word, as well as a number of other methods such as readInt().

Grich · Oct 29th, 2007, 11:56 PM

Also, remember to import the scanner class first.

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import java.util.Scanner;

truBlu · Oct 30th, 2007, 12:27 AM

Thanks guys. But what is the purpose of buffered input? Why is there a need to use those lines of code when you use the readLine() function?

Grich · Oct 30th, 2007, 8:52 PM

It leads to more efficient programming apparently. It stores collected input output into temporary storage area. For example instead of reading each key stroke, it is collected into a buffer until the enter key is pressed.
When you use the buffer, it is using a class. You have to write code to declare it and use it, it is a bit weird at first to get used to JAVA and classes, but you get used to it.

~s.o.s~ · Oct 31st, 2007, 8:56 PM

> Why is there a need to use those lines of code when you use the readLine() function?
Scanner class was introduced in JDK 1.5 as a utility class which would serve as a golden hammer when doing I/O. Prior to that, if you wanted to accept user input via console, you had to use the BufferedReader, the way it is specified in the second post.

DaWei · Oct 31st, 2007, 11:44 PM

Build a piece of hardware and make it amenable to people who don't understand the bottom line. What else can I say?

Oct 29th, 2007, 10:26 PM	#1
truBlu Newbie Join Date: Sep 2007 Location: New Jersey Posts: 13 Rep Power: 0	Buffered input? Do I need the following lines of code when I want to input whole lines of text? If so, why do I need them? I found this code on the internet but I'm unsure of the purpose behind it. I tried google searching for the answer but came up short. (Toggle Plain Text) InputStreamReader converter = new InputStreamReader(System.in); BufferedReader input = new BufferedReader(converter); String word = input.readLine(); InputStreamReader converter = new InputStreamReader(System.in); BufferedReader input = new BufferedReader(converter); String word = input.readLine();

Oct 29th, 2007, 10:53 PM	#2
titaniumdecoy Expert Programmer Join Date: Nov 2005 Posts: 837 Rep Power: 3	Re: Buffered input? That is one way to read standard input. A better way is to use a Scanner: (Toggle Plain Text) Scanner sc = new Scanner(System.in); Scanner sc = new Scanner(System.in); You can use the nextLine() method to read an entire line, or next() to read the next word, as well as a number of other methods such as readInt().

Oct 29th, 2007, 11:56 PM	#3
Grich Hobbyist Programmer Join Date: Sep 2007 Location: Sydney - Australia Posts: 150 Rep Power: 1	Re: Buffered input? Also, remember to import the scanner class first. (Toggle Plain Text) import java.util.Scanner; import java.util.Scanner; __________________ SYNTAX ERROR ...

Oct 30th, 2007, 12:27 AM	#4
truBlu Newbie Join Date: Sep 2007 Location: New Jersey Posts: 13 Rep Power: 0	Re: Buffered input? Thanks guys. But what is the purpose of buffered input? Why is there a need to use those lines of code when you use the readLine() function?

Oct 30th, 2007, 8:52 PM	#5
Grich Hobbyist Programmer Join Date: Sep 2007 Location: Sydney - Australia Posts: 150 Rep Power: 1	Re: Buffered input? It leads to more efficient programming apparently. It stores collected input output into temporary storage area. For example instead of reading each key stroke, it is collected into a buffer until the enter key is pressed. When you use the buffer, it is using a class. You have to write code to declare it and use it, it is a bit weird at first to get used to JAVA and classes, but you get used to it. __________________ SYNTAX ERROR ...

Oct 31st, 2007, 8:56 PM	#6
~s.o.s~ Megalomaniac Join Date: Nov 2006 Posts: 8 Rep Power: 0	Re: Buffered input? > Why is there a need to use those lines of code when you use the readLine() function? Scanner class was introduced in JDK 1.5 as a utility class which would serve as a golden hammer when doing I/O. Prior to that, if you wanted to accept user input via console, you had to use the BufferedReader, the way it is specified in the second post. __________________ "Be and not seem."

Oct 31st, 2007, 11:44 PM	#7
DaWei Resident Grouch Join Date: Jun 2005 Posts: 6,453 Rep Power: 10	Re: Buffered input? Build a piece of hardware and make it amenable to people who don't understand the bottom line. What else can I say? __________________ Abstraction doesn't make it impossible to write bad code; it makes it possible to write superior code. Contributor's Corner: Grumpy on C++ Exceptions DaWei on Pointers

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Programming Forums > Application Development > Java

Buffered input?