Writing to the same file

So, I'm writing the output of two different in a txt file java class files, while the program is running.  The name of the file is determined before the program is run through the prompt as arguments.  How can I get the second class file to change the file txt even without compilation errors.

For now, I'll just send everything as the second file outputs a message string variable, so that the main class for the text file.  I still want to learn to write in the same text file directly in the second class file.  Don't need code written just a couple of pointers in the right direction.

package Week7.Project3;
import java.io.*;

public class Test{
    public static void main(String[] args) throws IOException{
        int x;
        //create a new file internally called doc.  But externally labelled the user input
        File doc = new File(args[0]);
        if (doc.exists()){
            System.out.println("File exists");
            System.exit(1);
        }
        //creates new output writing method to the doc file
        PrintWriter write = new PrintWriter(doc);
      
        //Creates 10 instances of the Banjo
        write.println("Let's gather 10 Banjos.");
        Banjo instruments[] = new Banjo[10];
        for (x = 0; x < instruments.length; x++){
            instruments[x] = new Banjo();
        }
        //Tunes all 10 Banjos
        write.println("\nTuning the 10 Banjos.");
        for (x = 0; x < instruments.length; x++){
            instruments[x].tunedBanjo();
        }
        //Give even banjos Resonators
        write.println("\nLets give the even Banjos resonators.");
        for (x = 1; x < instruments.length; x+=2){
            instruments[x].setResonator();
        }
        //Starts playing banjos
        write.println("\nLets start playing the Banjos.");
        for (x = 0; x < instruments.length; x++){
            instruments[x].setPlayBanjo();
        }
        //Stops playing the banjos
        write.println("\nLets stop playing the Banjos.");
        for (x = 0; x < instruments.length; x++){
            instruments[x].stopBanjo();
        }
        write.close();
    }
}

second file

package Week7.Project3;

import java.util.Arrays;
import java.io.*;

public class Banjo{
    private int numberStrings = 5;
    private String banjoName = "Banjo "; //first name of  each banjo
    private String stringNotes[] = {"D", "B", "G", "D", "G"};
    private String arg;
    private boolean tunedStatus; //Is the banjo tuned?
    private boolean playStatus; //Is the banjo Playing?
    private boolean resonator; //Open back or resonator
    private static int banjoNumber = 0; //helps name banjos
  
    public Banjo(){
        tunedStatus = false;
        playStatus = false;
        resonator = false;
        banjoNumber += 1;
        banjoName += banjoNumber;
        write.println(banjoName + " created. \n\t It has " + numberStrings + " strings." +
                "\n\t Notes: " + Arrays.toString(stringNotes) + "\n\t Not tuned with open back.");
    }
  
    public void tunedBanjo(){
        tunedStatus = true;
        write.println(banjoName + " is now tuned");
    }
  
    public void setPlayBanjo(){
        playStatus = true;
        write.println(banjoName + " is now playing");
    }
  
    public void stopBanjo(){
        playStatus = false;
        write.println(banjoName + " has stopped being played.");
    }
  
    public void setResonator(){
        resonator = true;
        write.println(banjoName + " now has a resonator.");
    }
}

You have to pass the PrintWriter created to the file of Banjo, for example

for (x =0; x < instruments.length; x++) {
     instruments[x] = new Banjo(write);
}

and then of course change manufacturer the banjo

public Banjo (writing PrintWriter)

Tags: Java

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