String input = "aa";
String output = "aa";
//===============================
final int CRETVAL = 1000;
int ax = 400;
int by = 20;
int cx = CRETVAL;
int dy = 20;
int size = 22;
int spacing = 25;
//===============================
int numLetters = 26;
int numLetPerWord = 5;
//===============================
int baseval =0;
//===============================
//String all[] = {""};
String testing[] = new String[8560];
int testLength;
//===============================
int iter = 0;
int[][] Grid = new int[27][27];
float[][] percentGrid = new float[27][27];
float[] percents = new float[26];
//===============================
String interim = "";
char plholder1 = 'a';
char plholder2 = 'a';
int arx, ary;
//===============================

void setup() {
  frameRate(240);
  background(0);
  size(700, 700);
  strokeWeight(4);
  stroke(255);
  line(width/2, 0, width/2, height);
  String all5Letters[]  = loadStrings("5letterwords.txt");
  //String Test[]  = loadStrings("5lettertest.txt");
  arrayCopy(all5Letters, testing);
  // arrayCopy(Test, testing);
  //println("there are " + all5Letters.length + " lines");
  //println("there are " + Test.length + " lines in the test. They are as follows:");
  //println(Test);
  testLength= all5Letters.length;
  fill(255, 255, 0);
  stroke(0, 200);
  println("Length = " +testLength);
  for (int i = 0; i<27; i++) {
    for (int j = 0; j<27; j++) {
      Grid[i][j] = baseval;
      //printArray(Grid[i][j]);
      //baseval ++;
    }
  }

  initGridVal();


  percentGrid = calculatePercents(Grid);
} // end setup


//>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>
void draw() {
  textSize(50);
  background(0);
  strokeWeight(4);
  stroke(255);
  line(width/2, 0, width/2, height);

  input = testing[iter];
  output = testing[iter];
  pushMatrix();
  textAlign(LEFT);
  text(input, 100, 60);
  textAlign(RIGHT);
  text(output, width-100, 60);
  popMatrix();
  if ( iter<testLength-1) {
    iter++;
  }
}
//>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>

//|GRID_INITIALIZATION|GRID_INITIALIZATION|GRID_INITIALIZATION|GRID_INITIALIZATION|
public void initGridVal() {
  for (int i = 0; i<testLength; i++) {
    interim = testing[i];
    for (int j = 0; j<numLetPerWord-1; j++) {
      plholder1 =  interim.charAt(j);
      plholder2 =  interim.charAt(j+1);
      arx = xArrayVal(plholder1);
      ary = yArrayVal(plholder2);
      Grid[arx][ary] ++;
    }
  }
  for (int i = 0; i<26; i++) {
    for (int j = 0; j<26; j++) {
      printArray(Grid[i][j]);
      //baseval ++;
    }
  }
}
//|GRID_INITIALIZATION|GRID_INITIALIZATION|GRID_INITIALIZATION|GRID_INITIALIZATION|

//<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<
public int xArrayVal(char in1) { //first letter
  //  int retX = Character.getNumericValue(in1)-36;
  int retX = (int)in1-97;
  return retX;
}

public int yArrayVal(char in2) { // second letter
  // int retY = Character.getNumericValue(in2)-36;
  int retY = (int)in2-97;
  return retY;
}
//<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<

/*
                                                i

 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27
 1                                                                         
 2                                                                          
 3                                                                          
 4                                                                          
 5                                                                            
 6
 7
 8
 9
 10
 11
 12
 j     13
 14
 15
 16
 17
 18
 19
 20
 21
 22
 23
 24
 25
 26
 27
 */

//% % % % % % % % % % % % % % % % % % % % % % % % % % % % % % % % % % % % % % % 
public float[][]calculatePercents(int[][] importGrid) {
  float[][] ArrPercents = new float[27][27];
  int[] totalPerRow = new int[27]; 

  for (int k = 0; k<27; k++) {    
    for (int l = 0; l<27; l++) {
      totalPerRow[k] += importGrid[k][l];
    }
  }
  printArray(totalPerRow);

  for (int I = 0; I<27; I++) {    
    for (int J = 0; J<27; J++) {

      ArrPercents[I][J] = (Grid[I][J]) /(totalPerRow[I]);
    }
  }
  print("+++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++");
  printArray(ArrPercents);

  return ArrPercents;
}
//% % % % % % % % % % % % % % % % % % % % % % % % % % % % % % % % % % % % % % % 


//+C+C+C+C+C+C+C+C+C+C+C+C+C+C+C+C+C+C+C+C+C+C+C+C+C+C+C+C+C+C+C+C+C+C+C+C+C+C+
public String returnWeightedLetters(float[] percentArray) {
  String weightedLetters = "";
  int percent = 0;
  char added = 'a';
  //for(int i = 0; i< percentArray.length; i++){
  for (int i = 0; i< 26; i++) {
    percent = int(100*percentArray[i]);
    for (int j = 0; j<percent; j++) {
      weightedLetters = weightedLetters + added;
    }
    added++;
  }

  return weightedLetters;
}


public String chooseNextLetter(String weightedInputLetters) {
  String returnLetter= "";
  int x = int(random(0, weightedInputLetters.length()));
  returnLetter = returnLetter + weightedInputLetters.charAt(x);
  return returnLetter;
}
//+C+C+C+C+C+C+C+C+C+C+C+C+C+C+C+C+C+C+C+C+C+C+C+C+C+C+C+C+C+C+C+C+C+C+C+C+C+C+


public String splice(String a, String b) {
  String result = "";

  return result;
}

If i run the following sketch and press ENTER i get null in the console.

String[] buttons; 
String displayButtons;

void setup(){  
  buttons = new String[3]; 
  displayButtons = join(buttons, " : ");
}

void draw(){
}

void keyPressed() {
  if ((key=='1')) { 
   buttons[0] = "You pressed button one";
  }

  if ((key=='2')) { 
    buttons[1] = "You pressed button two";
  }

  if ((key==ENTER)) { 
    printArray(displayButtons);
  }
}

void makeChord(int tuning){

    float[] chord = new float[3];
    chord[0] = 10;
    chord[1] = 11;
    chord[2] = 12;
    println("CHORD "+chord);
}

will print something like

CHORD [F@704c6d5c
CHORD [F@299fec9d
CHORD [F@42674cc4
CHORD [F@be0f9eb
CHORD [F@436c8512

the function gets callend inside another function that's inside the draw. if I put this code in the draw, it will throw the same result. In a new sketch instead it will work fine. no errors in the console

same result also if I do this way

float[] chord = {10,10,10};
println("CHORD "+chord);

note that I have other arrays in the same sketch and they all work fine) thanks

I am trying to make a data store and I want to ask the user the question if he wants to use an existing file or he wants to create a new one, for that I have to read the filenames and print him the existing ones, and I don't know how to do that, I already had a look at another contribution but that didn't help me (I am not the best programmer)

Sample Code:

float[] f = { 0.3, 0.4, 0.5 };
printArray(f);

// The above code prints:
// [0] 0.3
// [1] 0.4
// [2] 0.5

https://www.processing.org/reference/printArray_.html

Thanks very much in advance.