//x and y are position of player and vx and vy are the velocities in respective directions
public void tick() {
    x+=vx;
    y+=vy;

    collision();
    //movement
    //...
}
private void collision() {
    for(int i = 0; i< handler.object.size(); i++) {
        GameObject tempObject = handler.object.get(i);

        if(tempObject.getId() == ID.Block) {
            if(getBounds().intersects(tempObject.getBounds())) {
                x +=-vx;
                y +=-vy;
            }

        } //...
public Rectangle getBounds() {
    return new Rectangle((int)x,(int)y,32,32);
}