How to stop Processing from overwriting txt file?

Mitch_

Im wrote the following code but i wanna make it so that it will not overwrite the existing strings in the .txt file. Every time i run the sketch the createWriter command overwrites the .txt file. How do i make it so that it keeps the strings in the .txt file even when i run the sketch again?

Also i only want to print the first 10 lines of the txt file in the console when i press the ENTER key. But if the file contains only 3 lines i get an ArrayIndexOutOfBoundsException. How do i stop this from happening?

PrintWriter history;

void setup() {
  size(700, 350);
  history = createWriter("history.txt");
}

void draw() {
}

void keyPressed() {
  if ((key=='1')) { 
    history.println("User pressed 1");
  }

  if ((key=='2')) { 
    history.println("User pressed 2");
  }

  if ((key == ENTER)) {
    history.flush(); 
    history.close();
    String[] history = loadStrings("history.txt");
    for (int i = 0; i <= 9; i++) { //only print first 10 lines
        printArray("[" + i + "] " + history[i]);
    }
  }
}

Any help will be appreciated :)

KevinWorkman

Are you trying to append the data to the end of the file?

If so, Google "Java append to file" for a ton of results. But basically you need to create a FileWriter that's set to append and then use that to write your strings.

koogs

But if the file contains only 3 lines i get an ArrayIndexOutOfBoundsException. How do i stop this from happening?

use history.length instead of 9 in your for loop.