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Getting output with Java is pretty easy as you can make use of System.out.print and the like.
Input, on the other hand, seems a little different. Some people recommend java.util.Scanner while others recommend java.io.BufferedReader, and I'm sure there's plenty of other recommendations. The two methods above are most regularly-used.
Neither seem to present very nice options (in my opinion). So, is there any better way to get input from a console window in Java? And if there isn't, which should I choose?
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Java Bufferedreader Class This is probably the best input method in Java. When the buffered character input stream is created, an internal buffer is set automatically. This buffer, by default, has a size of 8KB, which can be changed using the BufferedReader(Reader, int) constructor.
Using Reader Class It uses inputDataStream to read through the stream of data and uses read() method and nextInt() methods for taking inputs. It is the fastest method in java for input.
In the Java program, there are 3 ways we can read input from the user in the command line environment to get user input, Java BufferedReader Class, Java Scanner Class, and Console class.
There are three classes using which we can take console input: BufferedReader class. Scanner class. Console class.
I think, The scanner class is quite helpful. For example with BufferedReader, you have to read a line at a time and parse it for the values. But in the scanner you get integers with nextInt() method etc.
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I feel Scanner is helpful in two aspects,
1) you can get input from command prompt and infuture if you want to change to file system, it will be quick
2) While reading integer inputs you don't need to parse
. I prefer Scanner.
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Scanner is handy, but it is slower than BufferedReader.
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BufferedReader is quite complex and a bit lengthy to use but it must faster than scanner, if you want to take input for competitive coding purpose ,must use BufferedReader. Also there are many way you can check here.https://www.geeksforgeeks.org/fast-io-in-java-in-competitive-programming/
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