Example
// Learning Processing
// Daniel Shiffman
// http://www.learningprocessing.com

// Example 18-1: User input

PFont f;

// Variable to store text currently being typed
String typing = "";

// Variable to store saved text when return is hit
String saved = "";

void setup() {
  size(300,200);
  f = createFont("Arial",16,true);
}

void draw() {
  background(255);
  int indent = 25;
  
  // Set the font and fill for text
  textFont(f);
  fill(0);
  
  // Display everything
  text("Click in this applet and type. \nHit return to save what you typed. ", indent, 40);
  text(typing,indent,90);
  text(saved,indent,130);
}

void keyPressed() {
  // If the return key is pressed, save the String and clear it
  if (key == '\n' ) {
    saved = typing;
    // A String can be cleared by setting it equal to ""
    typing = ""; 
  } else {
    // Otherwise, concatenate the String
    // Each character typed by the user is added to the end of the String variable.
    typing = typing + key; 
  }
}
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  • http://www.watch-d-movie.de/ mr.winkle

    Thank you so much for this!
    For those wondering about deleting mistyped letters insted of

    typing = typing + key;

    use this:

    if (keyCode == BACKSPACE) {
    typing = typing.substring(0, typing.length() – 1);
    }
    else
    if (key != CODED) typing += key;

    greets, mr.winkle

  • Josemg14

    I love processing and your examples are the best

  • Douglas

    Hi, Thanks for the code. :)

    Is there a way of exporting each of the saved lines to a text file or similar? I want to automate a process of typing a line then programming the text onto a LCD board to be displayed.

    Thanks

  • shiffman

    check out PrintWriter or saveStrings()

  • EdMaxPrime

    When I tried this in my code it adds the key code to the string instead of an alphanumeric character.

  • Giaky

    I have a question, if I enter only numbers, can i transform the string in a float that i can use later?

  • shiffman

    yes.

    float num = float(typing);