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  1. import java.util.*;
  2.  
  3. class Cat
  4. {
  5.    int age;
  6.  
  7.    Cat(int age)
  8.    {
  9.       this.age = age;
  10.    }
  11. }
  12.  
  13. class CatComparatorByAge implements Comparator<Cat>
  14. {
  15.    public int compare(Cat first, Cat second)
  16.    {
  17.       if (first.age < second.age)
  18.       	return -1;
  19.       else if (first.age == second.age)
  20.       	return 0;
  21.       else
  22.       	return 1;
  23.    }
  24. }
  25.  
  26. class Tester
  27. {
  28.    public static void main(String args[])
  29.    {
  30.       // list of cats.
  31.       List<Cat> list = new ArrayList<Cat>();
  32.       list.add(new Cat(5));
  33.       list.add(new Cat(1));
  34.       list.add(new Cat(6));
  35.       list.add(new Cat(7));
  36.       list.add(new Cat(3));
  37.  
  38.      //Collections.sort() can sort by a sorter.
  39.       Collections.sort(list, new CatComparatorByAge());// Sort array list
  40.  
  41. 	  //print sorted age list.
  42.       for(Cat cat: list)
  43.          System.out.print(cat.age + ", ");
  44.    }
  45. }
Success #stdin #stdout 0.07s 380160KB
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https://ideone.com/xSHNeN
language:
Java (HotSpot 12)
created:
9 years ago
visibility:
secret

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