Input output file help

Hey all, this is my first post and its nice to meet you all.

I appreciate all your help.

I have most of my program done already, but I'm having some problems with input and output files. There are 2 files of each. Lab4Input1.txt and 2 and Lab4Output1.txt and 2. The problem I'm having is selecting which file a user picks.

The code is as follows for what I'm having issues with:

Scanner keyIn = new Scanner(System.in); //assigns "keyIn" to keyboard
//////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////
int fileNum;
String inName;
String outName;
boolean inputBad = true;

do
{
System.out.print("Please enter file number, 1 or 2 > ");
fileNum = keyIn.nextInt( );

if (fileNum == 1 || fileNum == 2);
boolean inputBad = false;


}
while (inputBad = true);



///////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////

if (fileNum == 1)
{
Scanner inName = new Scanner(new FileReader("Lab4Input1.txt"))
PrintWriter outName = new PrintWriter("Lab4Output1.txt");
}
else
{
inName = "Lab4Input2.txt";
outName = "Lab4Output2.txt";
}

The first part I don't understand, its what my teacher said, but I dont know what it means. Why do I need to the inputBad = false; stuff.

The second part is what I am really stuck on. A user is supposed to type in which file he wants to choose, 1 or 2. My problem is making the code for how it chooses which files to use.

The first part is just making sure the user enters a 1 or 2. If the user enters something else, it will repeat the question.

As for the second part, read this: Lesson: Basic I/O (The Java™ Tutorials > Essential Classes)

Code :

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while (inputBad = true);

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Shouldn't that be:

Code :

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while (inputBad == true);

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Or even shorter:

Code :

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while (inputBad);

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Also, one other thing is that your if statement contains a null statement because you follow it immediately with a semicolon. If you want the next line of code to execute when the if condition is fulfullied, remove the semicolon.

Quote:

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Originally Posted by mjpam

Also, one other thing is that your if statement contains a null statement because you follow it immediately with a semicolon. If you want the next line of code to execute when the if condition is fulfullied, remove the semicolon.

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Good catch. Better yet, always use {} blocks for if statements and loops.