Group
File Handling in C#
Objective
1. The program accepts a C# source file as input from the command line.
2. It then reads the content of the C# file, processes it line by line, and applies the necessary transformations (e.g., changing Main() to main(String[] args)).
3. The transformed code is saved as a Java source file, which can be compiled and run in a Java environment.
4. The program should handle simple replacements, such as type and method changes, and can be extended with further improvements.
Create a basic C# to Java translator. It must accept a C# source file, and create an equivalent Java source file. It will receive the file name in the command line, and it must translate at least: "Main()" into "main( String[] args )" "string" into "String" "bool" into "boolean" "Console.WriteLine" into "System.out.println" " : " into " extends " if it is in the same line as the word "class" (and any further improvements you may think of, such as strings handling, or converting a ReadLine to a try-catch block).
Example C# Exercise
Show C# Code
using System;
using System.IO;
using System.Text.RegularExpressions;
class CSharpToJavaTranslator
{
// Method to translate C# code to Java code
public static void Translate(string inputFile, string outputFile)
{
// Read the C# source code
string[] lines = File.ReadAllLines(inputFile);
// Open the output file for writing the translated Java code
using (StreamWriter writer = new StreamWriter(outputFile))
{
foreach (string line in lines)
{
// Translate the main method
string translatedLine = line;
translatedLine = translatedLine.Replace("Main()", "main(String[] args)");
// Translate C# types to Java types
translatedLine = translatedLine.Replace("string", "String");
translatedLine = translatedLine.Replace("bool", "boolean");
// Translate Console.WriteLine to System.out.println
translatedLine = translatedLine.Replace("Console.WriteLine", "System.out.println");
// Translate C# class declaration to Java class declaration with "extends"
if (translatedLine.Contains("class") && translatedLine.Contains(":"))
{
translatedLine = translatedLine.Replace(" : ", " extends ");
}
// Further improvements can be made here (e.g., converting ReadLine to try-catch)
// Write the translated line to the output file
writer.WriteLine(translatedLine);
}
}
Console.WriteLine($"Translation completed. Java file saved as {outputFile}");
}
}
class Program
{
static void Main(string[] args)
{
// Check if the file name was provided as a command-line argument
if (args.Length != 1)
{
Console.WriteLine("Usage: CSharpToJavaTranslator ");
return;
}
// Get the input C# file name
string inputFile = args[0];
// Define the output Java file name (it will append .java extension)
string outputFile = Path.ChangeExtension(inputFile, ".java");
// Call the translation method
CSharpToJavaTranslator.Translate(inputFile, outputFile);
}
}
Output
// If the input C# file (example.cs) contains:
using System;
class Program : BaseClass
{
static void Main()
{
string name = "John Doe";
bool isActive = true;
Console.WriteLine(name);
}
}
//The translated Java file (example.java) will contain:
import java.io.*;
class Program extends BaseClass
{
public static void main(String[] args)
{
String name = "John Doe";
boolean isActive = true;
System.out.println(name);
}
}