// collectiontopics/CollectionMethods.java

// (c)2017 MindView LLC: see Copyright.txt

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

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

// Things you can do with all Collections

import java.util.*;

import static onjava.HTMLColors.*;

public class CollectionMethods {

public static void main(String[] args) {

Collection<String> c =

new ArrayList<>(LIST.subList(0, 4));

c.add("ten");

c.add("eleven");

show(c);

border();

// Make an array from the List:

Object[] array = c.toArray();

// Make a String array from the List:

String[] str = c.toArray(new String[0]);

// Find max and min elements; this means

// different things depending on the way

// the Comparable interface is implemented:

System.out.println(

"Collections.max(c) = " + Collections.max(c));

System.out.println(

"Collections.min(c) = " + Collections.min(c));

border();

// Add a Collection to another Collection

Collection<String> c2 =

new ArrayList<>(LIST.subList(10, 14));

c.addAll(c2);

show(c);

border();

c.remove(LIST.get(0));

show(c);

border();

// Remove all components that are

// in the argument collection:

c.removeAll(c2);

show(c);

border();

c.addAll(c2);

show(c);

border();

// Is an element in this Collection?

String val = LIST.get(3);

System.out.println(

"c.contains(" + val + ") = " + c.contains(val));

// Is a Collection in this Collection?

System.out.println(

"c.containsAll(c2) = " + c.containsAll(c2));

Collection<String> c3 =

((List<String>)c).subList(3, 5);

// Keep all the elements that are in both

// c2 and c3 (an intersection of sets):

c2.retainAll(c3);

show(c2);

// Throw away all the elements

// in c2 that also appear in c3:

c2.removeAll(c3);

System.out.println(

"c2.isEmpty() = " + c2.isEmpty());

border();

// Functional operation:

c = new ArrayList<>(LIST);

c.removeIf(s -> !s.startsWith("P"));

c.removeIf(s -> s.startsWith("Pale"));

// Stream operation:

c.stream().forEach(System.out::println);

c.clear(); // Remove all elements

System.out.println("after c.clear():" + c);

}

}

/* Output:

AliceBlue

AntiqueWhite

Aquamarine

Azure

ten

eleven

******************************

Collections.max(c) = ten

Collections.min(c) = AliceBlue

******************************

AliceBlue

AntiqueWhite

Aquamarine

Azure

ten

eleven

Brown

BurlyWood

CadetBlue

Chartreuse

******************************

AntiqueWhite

Aquamarine

Azure

ten

eleven

Brown

BurlyWood

CadetBlue

Chartreuse

******************************

AntiqueWhite

Aquamarine

Azure

ten

eleven

******************************

AntiqueWhite

Aquamarine

Azure

ten

eleven

Brown

BurlyWood

CadetBlue

Chartreuse

******************************

c.contains(Azure) = true

c.containsAll(c2) = true

c2.isEmpty() = true

******************************

PapayaWhip

PeachPuff

Peru

Pink

Plum

PowderBlue

Purple

after c.clear():[]

*/