:\ тупая задача

@Override
    public synchronized int compareTo(Beach o) {
        return (int) (getDistance() - o.getDistance()) + (getQuality() + o.getQuality());
    }

@Override
    public synchronized int compareTo(Beach o) {
        return (int) (-getDistance() + o.getDistance()) + (getQuality() - o.getQuality());
    }

@Override
    public synchronized int compareTo(Beach o) {
        return (this.quality - o.quality) + (int) (this.distance - o.distance) ;
    }

вернуть (целочисленное) (эта.дистанция - сравниваемыйОбъект.дистанция) + (сравниваемыйОбъект.качество - это.качество);

@Override
   public synchronized int compareTo(Beach o) {
       return (int) (this.distance - o.distance) + (o.quality - this.quality);
   }

package com.javarush.task.task17.task1714;

/*
Comparable
*/

public class Beach implements Comparable<Beach> {
    private String name;      //название
    private float distance;   //расстояние
    private int quality;    //качество

    public Beach(String name, float distance, int quality) {
        this.name = name;
        this.distance = distance;
        this.quality = quality;
    }

    public synchronized String getName() {
        return name;
    }

    public synchronized void setName(String name) {
        this.name = name;
    }

    public synchronized float getDistance() {
        return distance;
    }

    public synchronized void setDistance(float distance) {
        this.distance = distance;
    }

    public synchronized int getQuality() {
        return quality;
    }

    public synchronized void setQuality(int quality) {
        this.quality = quality;
    }

    public synchronized static void main(String[] args) {

    }

    /*@Override
    public synchronized int compareTo(Beach o) {
        return (int) (getDistance() - o.getDistance()) + (getQuality() + o.getQuality());
    }*/

    @Override
    public synchronized int compareTo(Beach o) {
        return (int) (this.distance - o.distance) + (o.quality - this.quality);
    }
}

public synchronized static void main(String[] args) {

  }

@Override
    public synchronized int compareTo(Beach obj) {
        int current = 0;
        int other = 0;
        float deltaDistance = distance - obj.getDistance();
        if(deltaDistance > 0) {
            other++;
        } else if(deltaDistance < 0) {
            current++;
        }
        int deltaQuality = quality - obj.getQuality();
        if(deltaQuality > 0) {
            current++;
        } else if(deltaQuality < 0) {
            other++;
        };
        return current - other;
    }

@Override
   public synchronized int compareTo(Beach o) {
       int count = 0;
       count = (this.getQuality() > o.getQuality()) ? count++ : count--;
       count = (this.getDistance() < o.getDistance()) ? count++ : count--;
       return count;
   }