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完整的容器分类法

填充容器

进行容器的填充时, 我们可以使用Collections.nCopies()来创建一个List, 或者使用fill来进行填充.

import java.util.*;class StringAddress {private String s;public StringAddress(String s) {this.s = s;}public String toString() {return super.toString() + " " + s;}}
public class FillingLists {public static void main(String[] args) {List<StringAddress> list = new ArrayList<>(Collections.nCopies(4, new StringAddress("Hello")));// [StringAddress@5bc935cc Hello, StringAddress@5bc935cc Hello, StringAddress@5bc935cc Hello, StringAddress@5bc935cc Hello]System.out.println(list);Collections.fill(list, new StringAddress("World"));// [StringAddress@3be5d207 World, StringAddress@3be5d207 World, StringAddress@3be5d207 World, StringAddress@3be5d207 World]System.out.println(list);}
}

一种Generator解决方案

我们可以定义一个生成器来进行容器的操作:

import java.util.*;interface Generator<T> {T next();
}class CollectionData<T> extends ArrayList<T> {public CollectionData(Generator<T> gen, int quantity) {for (int i = 0; i < quantity; i++) {add(gen.next());}}public static <T> CollectionData<T> list(Generator<T> gen, int quantity) {return new CollectionData<>(gen, quantity);}
}class Government implements Generator<String> {String[] foundation = ("strange women lying in ponds distributing swords is no basis for a system of government").split(" ");private int index;public String next() { return foundation[index++]; }
}
public class CollectionDataTest {public static void main(String[] args) {Set<String> set = new LinkedHashSet<>(new CollectionData<>(new Government(), 15));System.out.println(set);set.addAll(CollectionData.list(new Government(), 15));System.out.println(set);}
}

Map生成器

import java.util.LinkedHashMap;class Pair<K, V> {public final K key;public final V value;public Pair(K k, V v) {key = k;value = v;}
}public class MapData<K, V> extends LinkedHashMap<K, V> {public MapData(Generator<Pair<K, V>> gen, int quantity) {for (int i = 0; i < quantity; i++) {Pair<K, V> p = gen.next();put(p.key, p.value);}}public MapData(Generator<K> genK, Generator<V> genV, int quantity) {for (int i = 0; i < quantity; i++) {put(genK.next(), genV.next());}}public MapData(Generator<K> genK, V value, int quantity) {for (int i = 0; i < quantity; i++) {put(genK.next(), value);}}public MapData(Iterable<K> genK, Generator<V> genV) {for (K key: genK) {put(key, genV.next());}}public MapData(Iterable<K> genK, V value) {for (K key: genK) {put(key, value);}}public static <K, V> MapData<K, V> map(Generator<Pair<K, V>> gen, int quantity) {return new MapData<K, V>(gen, quantity);}public static <K, V> MapData<K, V> map(Generator<K> genK, Generator<V> genV, int quantity) {return new MapData<K, V>(genK, genV, quantity);}public static <K, V> MapData<K, V> map(Generator<K> genK, V value, int quantity) {return new MapData<K, V>(genK, value, quantity);}public static <K, V> MapData<K, V> map(Iterable<K> genK, Generator<V> genV) {return new MapData<K, V>(genK, genV);}public static <K, V> MapData<K, V> map(Iterable<K> genK, V value) {return new MapData<K, V>(genK, value);}
}

我们可以使用封装好的MapData类:

import java.util.*;class Letters implements Generator<Pair<Integer, String>>, Iterable<Integer> {private int size = 9;private int number = 1;private char letter = 'A';public Pair<Integer, String> next() {return new Pair<Integer, String>(number++, "" + letter);}public Iterator<Integer> iterator() {return new Iterator<Integer>() {public Integer next() { return number++; }public boolean hasNext() { return number < size; }public void remove() {throw new UnsupportedOperationException();}};}
}
public class MapDataTest {public static void main(String[] args) {// {1=A, 2=A, 3=A, 4=A, 5=A, 6=A, 7=A, 8=A, 9=A, 10=A, 11=A}System.out.println(MapData.map(new Letters(), 11));}
}

使用Abstract类

我们可以通过继承其Abstract类来定制Map,Set等.