Hey all I'm fairly new to this but I want to not hardcode a file to be read in but I want to read it in from the terminal/command prompt. Here is what I have so far, I'm hardcoding the filename in bufferedWriter but how can I make it to where I can do a command such as (java main < in.txt > out.txt). Thanks in advance.
public static void main(String[] args) {
String inFile = "in.txt";
String outFile = "out.txt";
if (args.length > 1) {
inFile = args[0];
outFile = args[1];
}
Lexer lexer = new Lexer(inFile);
try {
BufferedWriter writer = new BufferedWriter(new FileWriter(outFile));
Token t;
while ((t = lexer.nextToken()) != null) {
writer.write(t.toString());
writer.newLine();
}
writer.close();
System.out.println("Done tokenizing file: " + inFile);
System.out.println("Output written in file: " + outFile);
} catch (IOException e) {
e.printStackTrace();
}
}
You don't, the OS handles the IO redirection with java main < in.txt > out.txt. Instead you read from System.in and write to System.out. Alternatively, based on the code you posted you might run it with
java main in.txt out.txt
Then your program would receive "in.txt" as args[0] and "out.txt" as args[1].
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