// Code excerpts showing the implementation of my collision classes.

// Collision Classes
private ScreenCollisionDetector scrnDet;
private ContactResolver contRes = new ContactResolver(10);

// Initialization
this.scrnDet = new ScreenCollisionDetector(this.screen);

// Adding objects whose collisions need to be checked
this.scrnDet.addToCheckList(this.imageSprite);
this.scrnDet.addToCheckList(this.imageSprite2);
this.scrnDet.addToCheckList(this.animSprite);

// This function is called at every frame
private void checkCollisions(long timePassed) {
     ArrayList<Contact> contacts = this.scrnDet.checkScreenCollisions();
     this.contRes.resolveContacts(contacts, contacts.size() - 1, timePassed);
}