OnJava8-Examples/collections/ListFeatures.java at master · CSapprenticeWT/OnJava8-Examples · GitHub

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// collections/ListFeatures.java

// We make no guarantees that this code is fit for any purpose.

// Visit http://OnJava8.com for more book information.

import reflection.pets.*;

import java.util.*;

public class ListFeatures {

public static void main(String[] args) {

Random rand = new Random(47);

List<Pet> pets = new PetCreator().list(7);

System.out.println("1: " + pets);

Hamster h = new Hamster();

pets.add(h); // Automatically resizes

System.out.println("2: " + pets);

System.out.println("3: " + pets.contains(h));

pets.remove(h); // Remove by object

Pet p = pets.get(2);

System.out.println(

"4: " + p + " " + pets.indexOf(p));

Pet cymric = new Cymric();

System.out.println("5: " + pets.indexOf(cymric));

System.out.println("6: " + pets.remove(cymric));

// Must be the exact object:

System.out.println("7: " + pets.remove(p));

System.out.println("8: " + pets);

pets.add(3, new Mouse()); // Insert at an index

System.out.println("9: " + pets);

List<Pet> sub = pets.subList(1, 4);

System.out.println("subList: " + sub);

System.out.println("10: " + pets.containsAll(sub));

Collections.sort(sub); // In-place sort

System.out.println("sorted subList: " + sub);

// Order is not important in containsAll():

System.out.println("11: " + pets.containsAll(sub));

Collections.shuffle(sub, rand); // Mix it up

System.out.println("shuffled subList: " + sub);

System.out.println("12: " + pets.containsAll(sub));

List<Pet> copy = new ArrayList<>(pets);

sub = Arrays.asList(pets.get(1), pets.get(4));

System.out.println("sub: " + sub);

copy.retainAll(sub);

System.out.println("13: " + copy);

copy = new ArrayList<>(pets); // Get a fresh copy

copy.remove(2); // Remove by index

System.out.println("14: " + copy);

copy.removeAll(sub); // Only removes exact objects

System.out.println("15: " + copy);

copy.set(1, new Mouse()); // Replace an element

System.out.println("16: " + copy);

copy.addAll(2, sub); // Insert a list in the middle

System.out.println("17: " + copy);

System.out.println("18: " + pets.isEmpty());

pets.clear(); // Remove all elements

System.out.println("19: " + pets);

System.out.println("20: " + pets.isEmpty());

pets.addAll(new PetCreator().list(4));

System.out.println("21: " + pets);

Object[] o = pets.toArray();

System.out.println("22: " + o[3]);

Pet[] pa = pets.toArray(new Pet[0]);

System.out.println("23: " + pa[3].id());

}

/* Output:

1: [Rat, Manx, Cymric, Mutt, Pug, Cymric, Pug]

2: [Rat, Manx, Cymric, Mutt, Pug, Cymric, Pug, Hamster]

3: true

4: Cymric 2

5: -1

6: false

7: true

8: [Rat, Manx, Mutt, Pug, Cymric, Pug]

9: [Rat, Manx, Mutt, Mouse, Pug, Cymric, Pug]

subList: [Manx, Mutt, Mouse]

10: true

sorted subList: [Manx, Mouse, Mutt]

11: true

shuffled subList: [Mouse, Manx, Mutt]

12: true

sub: [Mouse, Pug]

13: [Mouse, Pug]

14: [Rat, Mouse, Mutt, Pug, Cymric, Pug]

15: [Rat, Mutt, Cymric, Pug]

16: [Rat, Mouse, Cymric, Pug]

17: [Rat, Mouse, Mouse, Pug, Cymric, Pug]

18: false

19: []

20: true

21: [Rat, Manx, Cymric, Mutt]

22: Mutt

23: 14

OnJava8-Examples/collections/ListFeatures.java at master · CSapprenticeWT/OnJava8-Examples · GitHub

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