Don’t know about Android, but at least in JavaSE, Scanner is slow. Internally, Scanner does UTF-8 conversion, which is useless in a file with floats. Since all you want to do is read floats from a file, you should go with the java.io package. The folks on SPOJ struggle with I/O speed.
Is Scanner slower than BufferedReader faster?
Scanner is bit slower as it need to parse data as well. BufferReader is faster than Scanner as it only reads a character stream. Scanner has methods like nextInt(), nextShort() etc.
Why is Scanner slow?
If scanning becomes slow, try these solutions: Scan your original at a lower resolution, if possible. Make sure your system meets the requirements for your operating system. … If necessary, increase your system’s memory or reduce the resolution.
Why Scanner is not working in Java?
The reason for your problem is that following the preceding nextInt() , you’re still on the same line, and nextLine() returns the rest of the current line. That is, nextLine() did not block for your input, because the current line still has an empty string remaining.
What is difference between buffer and Scanner?
One of the main differences between BufferedReader and Scanner class is that the former class is meant to just read String or text data while the Scanner class is meant to both read and parse text data into Java primitive types like int, short, float, double, and long.
Is scanner slow?
Don’t know about Android, but at least in JavaSE, Scanner is slow. Internally, Scanner does UTF-8 conversion, which is useless in a file with floats. Since all you want to do is read floats from a file, you should go with the java.io package.
What is difference between BufferedReader and InputStreamReader?
BufferedReader reads a couple of characters from the Input Stream and stores them in a buffer. InputStreamReader reads only one character from the input stream and the remaining characters still remain in the streams hence There is no buffer in this case.
How do I make my scanner scan faster?
To achieve faster scanning results, change the Resolution DPI to 100 in the User Settings window.
- Open or click on the SmartVault Launchpad.
- Click the User Settings link.
- Click the Scanners tab.
- Select the default scanner of choice.
- Change the Resolution setting to 100 dpi.
- Click OK.
How do I make my brother scanner faster?
Always select the simplest appropriate Scan type in order to maximize scan speed. For example, a B&W scan will produce a relatively small file size followed by, grayscale, and color producing the largest file size.
Why is ScanSnap so slow?
If the CPU or the memory does not meet the recommended system requirements, the scanning speed slows down. … Click the [Scan] button in the upper left of the main window of ScanSnap Home to display the scan window. If the main window is not already displayed, refer to To Display the Main Window.
Why BufferedReader is faster than scanner?
BufferedReader has significantly larger buffer memory than Scanner. … BufferedReader is a bit faster as compared to scanner because scanner does parsing of input data and BufferedReader simply reads sequence of characters.
Is scanner still used in Java?
Scanner is a class in java. util package used for obtaining the input of the primitive types like int, double, etc. and strings. It is the easiest way to read input in a Java program, though not very efficient if you want an input method for scenarios where time is a constraint like in competitive programming.
What is the input problem with scanner?
The problem is whenever the nextLine() method is called after anyone of the nextXXX() method then the method nextLine() doesnot read values from the console and it skips that step. So, the input from the nextLine() value which you want to read is ignored.