Sorry to ask so many questions in such a short space of time, but I'm really struggling with this.  I require the "pirates" in my code to intersect the "fuel cells" and when they do the cells must disappear.  No matter how I try it, the pirates just go straight through the fuel as if no collision is recorded. Both the pirates and fuel cells are generated by arrays.

Here's the Pirate class

1. //Create pirate class
   class Pirate {
     float xPos;
     float yPos;
     float xSpeed;
     float ySpeed;
   
     //Pirate radius
     int pr = 20;
   
     Pirate(float tempXPos, float tempYPos, float tempXSpeed, float tempYSpeed) {
       xPos = tempXPos;
       yPos = tempYPos;
       xSpeed = tempXSpeed;
       ySpeed = tempYSpeed;
     }
     //Hit function for pirates when they collide with the player
     void hit() {
       xPos = random(width);
       yPos = random(60, height);
     }
   
     //Display function for pirates  
     void display() {
       image(imgCar, xPos, yPos);
       pr = 20;
       xPos = xPos + xSpeed;
       yPos = yPos + ySpeed;
       if (xPos > width) {  //Pirates reset if they go off screen
         xPos = 0;
       }
       if (xPos < 0) {
         xPos = width;
       }
       if (yPos > height) {
         yPos = 45;
       }
       if (yPos < 45) {
         yPos = height;
       }
     }
   
     //Specify intersect conditions for player and pirates 
     boolean intersect(Player a) {
       float distance = dist(xPos, yPos, a.x_, a.y_);
       if (distance <= pr + a.r) {
         return true;
       }
       else {
         return false;
       }
     }
   
     //Specify intersect conditions for pirates and fuel
     boolean intersect(Fuel f) {
       float distance = dist(xPos, yPos, f.xF, f.yF);
       if (distance <= pr + f.fr) {
         return true;
       }
       else {
         return false;
       }
     }
   }
   

And the Fuel class

1. //Create fuel class
   class Fuel {
     float xF;
     float yF;
     //Fuel radius
     int fr = 20;
   
     Fuel(float posX, float posY) {
       xF = posX;
       yF = posY;
     }
   
     //Create show function for fuel
     void showFuel() {
       image(imgFuel, xF, yF);
     }
   
     //Specify intersect conditions for fuel and player
     boolean intersect(Player a) {
       float distance = dist(xF, yF, a.x_, a.y_);
       if (distance < fr + a.r) {
         return true;
       }
       else {
         return false;
       }
     }
   
     //Create collect function for when player picks up fuel
     void collect() {
       xF = (random(width));
       yF = (random(60, height));
       fuel = fuel + 100;
     }
   
     //Create lose function for when pirates collide with fuel
     void lose() {
       xF = 1000;
       yF = 1000;
     }
   }
   

And the code I'm trying to use to control behaviour upon collision

1.        //Pirate starting positions
     for (int i=0; i<pirates.length; i++) {
       int pSpeedx = (int)random(8);
       int pSpeedy = (int)random(8);
       pirates[i] = new Pirate(random(width), random(60, height), pirateSpeeds[pSpeedx], pirateSpeeds[pSpeedy]);
     }
   
2.    //Fuel Cell starting positions
     for (int i=0; i<cells.length; i++) {
       cells[i] = new Fuel(random(width), random(60, height));
     }
3.     //Show pirates
       for (int i = 0; i < pirates.length; i++) {
         pirates[i].display();
       }
4.     //Show fuel cells
       for (int i=0; i<cells.length; i++) {
         cells[i].showFuel();
       }
   
5. if (pirates[i].intersect(cells[i])) {
           cells[i].lose();
         }