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public class Coordinate {
 public int headX, headY;
 Coordinate(int headX, int headY) {
  this.headX = headX;
  this.headY = headY;
 }
  
 public boolean equals(Coordinate c) {
   if(this.headX == c.headX && this.headY == c.headY) {
      return true;
   } else {
      return false;
   }
}
˵Ã÷£ºCoordinate ÊÇÒ»¸ö×ø±êÀà£¬ÖØÐ´equals·½·¨µÄÔ­ÒòÊÇÒª±È½ÏÉßÉíÊÇ·ñµ½´ïÁ˼ǼÏÂÀ´µÄÉßÍ·µÄתÍäµã£¬ÓÚÊÇ×Ô¼ºÖØÐ´ÁËequals·½·¨£¬µ«ÊÇ·¢ÏÖûÓÐЧ¹û£¬¼´Ê¹x£¬yµÄÖµÒ»Ñù£¬·µ»ØµÄÒ²ÊÇfalse¡£
ΪÁ˽øÒ»²½ÊìϤequals·½·¨£¬ÓÚÊÇ×Ô¼ºÓÖÏÈдÁËÏÂÃæÒ»¸öÑéÖ¤µÄ³ÌÐò£º
public class TestEquals {
 public static void main(String[] args) {
  Dog d1 = new Dog(1);
  Dog d2 = new Dog(1);
  System.out.println(d1 == d2);
  System.out.println(d1.equals(d2));
 }
}
class Dog {
 int weight;
 
 Dog(int weight) {
  this.weight = weight;
 }
  public boolean equals(Dog d) {
    if(this.weight == d.weight) {
       return true;
    } else {
       return false;
    }
  }
}
µ±È»½á¹ûÊÇÒ»ÑùµÄ£¬ÎªÁ˽øÒ»²½ÑéÖ¤£¬ÓÚÊǾͽøÒ»²½ÖØÐ´ÁËhashCode()·½·¨£º
public int hashCode() {
   return 0;
}
ÒòΪÓÐʱºòÓÅÏȱȽϵÄÊÇhashCodeÂë¡£µ«Êǽá¹û»¹ÊDz»ÐС£ÎÒÖ»ºÃÕÒ»ØÔ­À´¿´¹ýµÄÂíÊ¿±øÀÏʦµÄÊÓÆµ½Ì³Ì£¬²Å·¢ÏÖ×Ô¼º¶ÔÕâ¸öÖØÐ´ºÜ²»ÊìϤ£¬ÕýÈ·µÄд·¨Ó¦¸ÃÊÇ£º
public class Coordinate {
 public int headX, headY;
 Coordinate(int headX, int headY) {
  this.headX = headX;
  this.headY = headY;
 }
 
 public int hashCode() {
  return 0;
 }
 
 public boolean equals(Object obj) {
  if(obj == null) {
   return false;
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