按objects字段对对象数组进行排序。如何制作比较器？Java/处理

Question

我有一个叫做“生物”的类和一组叫做“生物”的生物对象。类生物有一个称为距离的整数字段。我想根据阵列生物各自的距离字段对它们进行排序。我试过几种不同的方法，但没有走多远。有人能向我解释一下这是怎么回事吗?这样我就能弄清楚怎么做了？

Creature [] creatures;
int [] distancearray;                      //I made a seperate array to try and order the 
                                           //creatures array based on this array

distancearray = new int [numcreatures];
for (int i = 0; i < numcreatures; i++) {
  distancearray[i] = creatures[i].distance;
}
distancearray = sort(distancearray);      //sorting this array was easy but idk how to 
                                          //sort creatures based on it
...

class Creature /*implements Comparable*/{//First attempt at Comparable
...
/*
  int compareTo(Object otherObject){                //First try with Comparable
    Creature otherCreature = (Creature)otherObject;
    if (distance < otherCreature.distance) {
      return -1;
    }
    if (distance > otherCreature.distance) {
      return 1;
    } else {
      return 0;
    }
  }

  int compare(Creature C2){                         //Second try with Comparable
    if (distance < C2.distance) {
      return -1;
    }
    if (distance > C2.distance) {
      return 1;
    } else {
      return 0;
    }
  }
*/
}

我有时会遇到静态错误，有时不会。我把可比的设置正确了吗？如果是的话，我该如何使用呢？我不在乎如何排序数组，但最简单的方法是很好的。顺便说一下，我使用的是处理。

到目前为止，我尝试使用了以下几个来源：

Making a generic comparator class

Java Sorting: sort an array of objects by property, object not allowed to use Comparable

How to sort an array of objects in Java?

谢谢!

Answer 1

最简单的方法是使用比较器。假设您的getDistance类中有一个Creature方法

import java.util.Arrays;
import java.util.Comparator;

//may be more of your Processing code

Creature [] creatures = //your array;

void setup() {
  //sort your array here or in whatever method you want
  Arrays.sort(creatures, Comparator.comparingInt(Creature::getDistance));
}

class Creature {
    // your class code
}

//may be more of your Processing code