CODEWITHSUNDEEP
javaprintwriter
The Rationalist
The Rationalist

Reputation: 753

No output to file using PrintWriter

I get no compiling errors, but my code does not output anything to the saved files. The code does create the files, but they're empty. Does anybody see what I did wrong?

public class CellAutomataTest {
  public static void main(String[] args)
  {
    int rule = 120;//Integer.parseInt(args[0]);
    int numGen = 5;//Integer.parseInt(args[1]);
    String fileStem = "ca";//args[2];
    int width = 400;//Integer.parseInt(args[3]);
    int height = 400;//Integer.parseInt(args[4]);

    CellAutomata test = new CellAutomata(numGen, rule);

    PrintWriter writer = null;
    try {
        writer = new PrintWriter(new FileWriter(fileStem + ".js"));
    } catch (IOException ex) {
        Logger.getLogger(CellAutomataTest.class.getName()).log(Level.SEVERE, null, ex);
    }
    PrintWriter writer2 = null;
    try {
        writer2 = new PrintWriter(new FileWriter(fileStem + ".html"));
    } catch (IOException ex) {
        Logger.getLogger(CellAutomataTest.class.getName()).log(Level.SEVERE, null, ex);
    }

    writer.println("function draw() {");
    writer.println("var canvas = document.getElementById('CellAutomata');");
    writer.println("if (canvas && canvas.getContext) {");
    writer.println("var context = canvas.getContext('2d');");

    test.simulate(writer, width, height);

    writer2.println("<html>");
    writer2.println("<head>");
    writer2.println("<script src=\"" + fileStem + ".js></script>");
    writer2.println("<style type=\"text/css\">");
    writer2.println("canvas { border: 1px solid black; }");
    writer2.println("</style> </head>");
    writer2.println("<body onload=\"draw();\">");
    writer2.println("<h1>Cellular Automata with Rule " + rule + "</h1>");
    writer2.println("<canvas id=\"CellAutomata\" width=\"" + width + "\" height=\"" + height + "\">");
    writer2.println("<p>Your browser doesn't support canvas.</p>");
    writer2.println("</canvas> </body> </html>");
  }
}

Upvotes: 2

Views: 1121

Answers (1)

user684934
user684934

Reputation:

You need to use:

writer2.flush();
writer2.close();

to actually save the file.

Upvotes: 8

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