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  1. import java.util.*;
  2.  
  3. class Cat implements Comparable<Cat>
  4. {
  5.    int age;
  6.  
  7.    Cat(int age)
  8.    {
  9.       this.age = age;
  10.    }
  11.  
  12.  
  13.    public int compareTo(Cat other)
  14.    {
  15.       if (this.age < other.age)
  16.       	return -1;
  17.       else if (this.age == other.age)
  18.       	return 0;
  19.       else
  20.       	return 1;
  21.    }
  22.  
  23. }
  24.  
  25. class Tester
  26. {
  27.    public static void main(String args[])
  28.    {
  29.       // list of cats.
  30.       List<Cat> list = new ArrayList<Cat>();
  31.       list.add(new Cat(5));
  32.       list.add(new Cat(1));
  33.       list.add(new Cat(6));
  34.       list.add(new Cat(7));
  35.       list.add(new Cat(3));
  36.  
  37.       //Collections.sort() automatically sorts the list using our compareTo() method.
  38.       Collections.sort(list);
  39.  
  40. 	  //print sorted age list.
  41.       for(Cat cat: list)
  42.          System.out.print(cat.age + ", ");
  43.    }
  44. }
Success #stdin #stdout 0.07s 380160KB
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https://ideone.com/wVMK1y
language:
Java (HotSpot 12)
created:
9 years ago
visibility:
secret

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