How to check the answer right or wrong?

Now I want to make when use key play the music if the leap motion move to right square will output Right，contrary be wrong. How can I do that?

Here is my code.

import com.onformative.leap.*;
import com.leapmotion.leap.Finger;
import ddf.minim.*;
LeapMotionP5 leap;
Minim minim;
/////////////////// here is + music
AudioPlayer Bongo;
AudioPlayer cello;
AudioPlayer drumset;
AudioPlayer flute;
AudioPlayer Guitar;
AudioPlayer handbells;
AudioPlayer harmonica;
AudioPlayer Harp;
AudioPlayer marimba;
AudioPlayer oboe;
AudioPlayer piano;
AudioPlayer saxphone;
AudioPlayer Trombone;
AudioPlayer trumpet;
AudioPlayer Tuba;
AudioPlayer violin;

void setup()
{
  size(1280, 720, P3D);
  minim = new Minim(this);
  leap = new LeapMotionP5(this);

  Bongo = minim.loadFile("Bongo.wav");
  cello = minim.loadFile("cello.wav");
  drumset = minim.loadFile("drumset.wav");
  flute = minim.loadFile("flute.wav");
  Guitar = minim.loadFile("Guitar.wav");
  handbells = minim.loadFile("handbells.wav");
  harmonica = minim.loadFile("harmonica.wav");
  Harp = minim.loadFile("Harp.wav");
  marimba = minim.loadFile("marimba.wav");
  oboe = minim.loadFile("oboe.wav");
  piano = minim.loadFile("piano.wav");
  saxphone = minim.loadFile("saxphone.wav");
  Trombone = minim.loadFile("Trombone.wav");
  trumpet = minim.loadFile("trumpet.wav");
  Tuba = minim.loadFile("Tuba.wav");
  violin = minim.loadFile("violin.wav");
}

void draw() {
  background(200, 200, 200);
  text("Press r to reset.", 10, 20 );
  fill (255);
  for (Finger f : leap.getFingerList()) {
    PVector position = leap.getTip(leap.getFinger(1));

    if (position.x > 250 && position.x <400 && position.y > 150 && position.y < 250)
    {
      Bongo.play();
    } else
      Bongo.pause();

    if (position.x > 650 && position.x <800 && position.y > 150 && position.y < 250) {
      cello.play();
    } else
      cello.pause();

    if (position.x > 1050 && position.x <1200 && position.y > 150 && position.y < 250) {
      drumset.play();
    } else
      drumset.pause();

    if (position.x > 1450 && position.x <1600 && position.y > 150 && position.y < 250) {
      flute.play();
    } else
      flute.pause();

    if (position.x > 250 && position.x <400 && position.y > 350 && position.y < 500) {
      Guitar.play();
    } else
      Guitar.pause();

    if (position.x > 650 && position.x <800 && position.y > 350 && position.y < 500) {
      handbells.play();
    } else
      handbells.pause();

    if (position.x > 1050 && position.x <1200 && position.y > 350 && position.y < 500) {
      harmonica.play();
    } else
      harmonica.pause();

    if (position.x > 1450 && position.x <1600 && position.y > 350 && position.y < 500) {
      Harp.play();
    } else
      Harp.pause();

    if (position.x > 250 && position.x <400 && position.y > 550 && position.y < 750) {
      marimba.play();
    } else
      marimba.pause();

    if (position.x > 650 && position.x <800 && position.y > 550 && position.y < 750) {
      oboe.play();
    } else
      oboe.pause();

    if (position.x > 1050 && position.x <1200 && position.y > 550 && position.y < 750) {
      piano.play();
    } else
      piano.pause();

    if (position.x > 1450 && position.x <1600 && position.y > 550 && position.y < 750) {
      saxphone.play();
    } else
      saxphone.pause();

    if (position.x > 250 && position.x <400 && position.y > 750 && position.y < 950) {
      Trombone.play();
    } else
      Trombone.pause();

    if (position.x > 650 && position.x <800 && position.y > 750 && position.y < 950) {
      trumpet.play();
    } else
      trumpet.pause();

    if (position.x > 1050 && position.x <1200 && position.y > 750 && position.y < 950) {
      Tuba.play();
    } else
      Tuba.pause();

    if (position.x > 1450 && position.x <1600 && position.y > 750 && position.y < 950) {
      violin.play();
    } else
      violin.pause();

    stroke(0);
    strokeWeight(5);
    ellipse(position.x, position.y, 20, 20);
  }

  // Here is draw 16 square
  stroke(0, 0, 0);                                    // square
  strokeWeight(5);
  fill(255, 255, 255);
  rect(250, 100, 150, 150);

  fill(255, 255, 255);
  rect(650, 100, 150, 150);

  fill(255, 255, 255);
  rect(1050, 100, 150, 150);

  fill(255, 255, 255);
  rect(1450, 100, 150, 150);
  //-----------------------------------------------------------
  fill(255, 255, 255);
  rect(250, 350, 150, 150);

  fill(255, 255, 255);
  rect(650, 350, 150, 150);

  fill(255, 255, 255);
  rect(1050, 350, 150, 150);

  fill(255, 255, 255);
  rect(1450, 350, 150, 150);
  //-----------------------------------------------------------
  fill(255, 255, 255);
  rect(250, 600, 150, 150);

  fill(255, 255, 255);
  rect(650, 600, 150, 150);

  fill(255, 255, 255);
  rect(1050, 600, 150, 150);

  fill(255, 255, 255);
  rect(1450, 600, 150, 150);
  //-----------------------------------------------------------

  fill(255, 255, 255);
  rect(250, 850, 150, 150);

  fill(255, 255, 255);
  rect(650, 850, 150, 150);

  fill(255, 255, 255);
  rect(1050, 850, 150, 150);

  fill(255, 255, 255);
  rect(1450, 850, 150, 150);
}

void keyPressed()
{
  if ( key == 'r' ) {
    Bongo.rewind();
    cello.rewind();
    drumset.rewind();
    flute.rewind();
    Guitar.rewind();
    handbells.rewind();
    harmonica.rewind();
    Harp.rewind();
    marimba.rewind();
    oboe.rewind();
    piano.rewind();
    saxphone.rewind();
    Trombone.rewind();
    trumpet.rewind();
    Tuba.rewind();
    violin.rewind();

    if ( key == 'z' ) {
      Bongo.play();
    } else {
      Bongo.pause();
    }
    if ( key == 'x' ) {
      cello.play();
    } else {
      cello.pause();
    }
    if ( key == 'c' ) {
      drumset.play();
    } else {
      drumset.pause();
    }
    if ( key == 'v' ) {
      flute.play();
    } else {
      flute.pause();
    }
    if ( key == 'b' ) {
      Guitar.play();
    } else {
      Guitar.pause();
    }
    if ( key == 'n' ) {
      handbells.play();
    } else {
      handbells.pause();
    }
    if ( key == 'm' ) {
      harmonica.play();
    } else {
      harmonica.pause();
    }
    if ( key == 'a' ) {
      Harp.play();
    } else {
      Harp.pause();
    }
    if ( key == 's' ) {
      marimba.play();
    } else {
      marimba.pause();
    }
    if ( key == 'd' ) {
      oboe.play();
    } else {
      oboe.pause();
    }
    if ( key == 'f' ) {
      piano.play();
    } else {
      piano.pause();
    }
    if ( key == 'g' ) {
      saxphone.play();
    } else {
      saxphone.pause();
    }
    if ( key == 'h' ) {
      Trombone.play();
    } else {
      Trombone.pause();
    }
    if ( key == 'j' ) {
      trumpet.play();
    } else {
      trumpet.pause();
    }
    if ( key == 'k' ) {
      Tuba.play();
    } else {
      Tuba.pause();
    }
    if ( key == 'l' ) {
      violin.play();
    } else {
      violin.pause();
    }
  }
}