Hi all, having read  some of the discussions on here about simultaneous keyPresses I have written the following. I can now move the bats at the same time but only once. Once I release the keys the bats won't move any more. Any thoughts suggestions welcome.

 

Bat bat1;
Bat2 bat2;
Ball ball;

void setup() {
  size(1200, 800);
  smooth();
  background(0);
  bat1=new Bat(10, height/2, 20, 100);
  bat2=new Bat2(1170, height/2, 20, 100);
  ball=new Ball(width/2, height/2, 40);
}

void draw() {
  ball.move();
  ball.display();
  bat1.move();
  bat1.display();
  bat2.move();
  bat2.display();
}

class Ball {
  float xpos;
  float ypos;
  int diameter;
  float speed=0.5;

  Ball(float tempX, float tempY, int tempDiameter) {
    xpos=tempX;
    ypos=tempY;
    diameter=tempDiameter;
  }
  void move() {
    xpos+=random(-speed, speed);
    ypos+=random(-speed, speed);
  }
 
  void display() {
    ellipse(xpos, ypos, diameter, diameter);
  }
}

class Bat {
  float xpos;
  float ypos;
  int w;
  int h;
  float speed=1;
  boolean up, down;

  Bat(float tempX, float tempY, int tempW, int tempH) {
    xpos=tempX;
    ypos=tempY;
    w=tempW;
    h=tempH;
  }

  void move() {
    if (keyPressed) {
      if ((key=='A')||(key=='a')) {
        up=true;
      }if (up){
        ypos-=speed;
      }
    }
    if (keyPressed) {
      if ((key=='Z') || (key=='z')) {
        down=true;
      }if(down){
        ypos+=speed;
      }
    }
  }
  void keyReleased(){
  if (keyPressed){
      if ((key=='A')||(key=='a')) {
        up=false;
      }
     else if ((key=='Z') || (key=='z')) {
     down=false;
     }
  }
  }
 
  void display() {
    rect(xpos, ypos, w, h);
  }
}

 

class Bat2 {
  float xpos;
  float ypos;
  int w;
  int h;
  float speed=1;
  boolean up, down;

  Bat2(float tempX, float tempY, int tempW, int tempH) {
    xpos=tempX;
    ypos=tempY;
    w=tempW;
    h=tempH;
  }

  void move() {
    if (keyPressed && (key==CODED)) {
      if (keyCode==UP) {
        up=true;
      }if(up){
        ypos-=speed;
      }
    }
    if (keyPressed && (key==CODED)) {
      if (keyCode==DOWN) {
        down=true;
      }if(down){
        ypos+=speed;
      }
    }
  }
  void keyReleased(){
  if (keyPressed && (key==CODED)){
      if (keyCode==UP) {
        up=false;
      }
     else if (keyPressed && (key==CODED)) {
     if (keyCode==DOWN){
       down=false;
     }
  }
  }
  }
  void display() {
    rect(xpos, ypos, w, h);
  }
}