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  1. import java.util.ArrayList;
  2. import java.util.Collections;
  3.  
  4. public class Animal implements Comparable<Animal> {
  5.  
  6. 	private String name;
  7.  
  8. 	public Animal(String name) {
  9. 		this.name = name;
  10. 	}
  11.  
  12. 	public String toString() {
  13. 		return name;
  14. 	}
  15.  
  16. 	@Override
  17. 	public int compareTo(Animal that) {
  18. 		// compare the two animal objects by name
  19. 		return this.name.compareTo(that.name);
  20. 	}
  21.  
  22. 	public static void main(String[] args) {
  23.  
  24. 		ArrayList<Animal> animals = new ArrayList<Animal>();
  25. 		animals.add(new Animal("Zed"));
  26. 		animals.add(new Animal("Diesel"));
  27. 		animals.add(new Animal("Garfield"));
  28.  
  29. 		System.out.println("Animals before sort: ");
  30. 		System.out.println(animals);
  31.  
  32. 		Collections.sort(animals);
  33. 		System.out.println("Animals after sort: ");
  34. 		System.out.println(animals);
  35. 	}
  36.  
  37. }
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https://ideone.com/tT8B96
language:
C++ (gcc 8.3)
created:
11 years ago
visibility:
public

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