Editing Comparison of C Sharp and Java (section)

=== Input/output ===
Example illustrating how to copy text one line at a time from one file to another, using both languages.
{| class="wikitable"
|-
! Java
! C#
|-
|valign=top|<syntaxhighlight lang="Java" style="font-size:90%">
import java.nio.file.*;

class FileIOTest {

    public static void main(String[] args) throws Exception {
        var lines = Files.readAllLines(Paths.get("input.txt"));
        Files.write(Paths.get("output.txt"), lines);
    }
}
</syntaxhighlight>
|valign=top|<syntaxhighlight lang="csharp" style="font-size:90%">
using System.IO;

class FileIOTest
{
    public static void Main(string[] args)
    {
        var lines = File.ReadLines("input.txt");
        File.WriteAllLines("output.txt", lines);
    }
}
</syntaxhighlight>
|-
|valign=top|Notes on the Java implementation:
* {{code|Files.readAllLines}} method returns a List of String, with the content of the text file, Files has also the method {{mono|readAllBytes}}, returns an array of {{mono|Strings}}.
* {{code|Files.write}} method writes byte array or into an output file, indicated by a Path object.
* {{code|Files.write}} method also takes care of buffering and closing the output stream.

|valign=top|Notes on the C# implementation:
* The {{mono|ReadLines}} method returns an enumerable object that upon enumeration will read the file one line at a time.
* The {{mono|WriteAllLines}} method takes an enumerable and retrieves a line at a time and writes it until the enumeration ends.
* The underlying reader will automatically allocate a buffer, thus there is no need to explicitly introduce a buffered stream.
* {{mono|WriteAllLines}} automatically closes the output stream, also in the case of an abnormal termination.
|}