@kiraSally
2018-03-12T18:40:46.000000Z
字数 2800
阅读 1876
JAVA
COLLECTIONS
源码
1.7版本
- 读者请先阅读笔者的 集合番@LinkedHashMap一文通(1.7版)
- 笔者个人博客 kiraSally的掘金个人博客 感谢支持
LinkedHashMap
LinkedHashMap
)
public class LinkedHashSet<E>
extends HashSet<E>
implements Set<E>, Cloneable, java.io.Serializable
- 重点: LinkedHashSet的实现原理
/**
* Constructs a new, empty linked hash set. (This package private
* constructor is only used by LinkedHashSet.) The backing
* HashMap instance is a LinkedHashMap with the specified initial
* capacity and the specified load factor.
* LinkedHashSet独享该构造器,同时底层维护一个LinkedHashMap:
* -- 借用其的迭代有序和key不重复特性
* 因此在LinkedHashSet中只有其构造器的实现
* @param initialCapacity the initial capacity of the hash map
* @param loadFactor the load factor of the hash map
* @param dummy ignored (distinguishes this
* constructor from other int, float constructor.)
* @throws IllegalArgumentException if the initial capacity is less
* than zero, or if the load factor is nonpositive
*/
HashSet(int initialCapacity, float loadFactor, boolean dummy) {
map = new LinkedHashMap<>(initialCapacity, loadFactor);
}
/**
* Constructs a new, empty linked hash set with the specified initial
* capacity and load factor.
* 底层会调用父类的构造方法,构造一个有指定初始容量和加载因子的LinkedHashMap实例
* @param initialCapacity the initial capacity of the linked hash set
* @param loadFactor the load factor of the linked hash set
* @throws IllegalArgumentException if the initial capacity is less
* than zero, or if the load factor is nonpositive
*/
public LinkedHashSet(int initialCapacity, float loadFactor) {
super(initialCapacity, loadFactor, true);
}
/**
* Constructs a new, empty linked hash set with the specified initial
* capacity and the default load factor (0.75).
* 底层会调用父类的构造方法,构造一个带指定初始容量和默认加载因子0.75的LinkedHashMap实例
* @param initialCapacity the initial capacity of the LinkedHashSet
* @throws IllegalArgumentException if the initial capacity is less
* than zero
*/
public LinkedHashSet(int initialCapacity) {
super(initialCapacity, .75f, true);
}
/**
* Constructs a new, empty linked hash set with the default initial
* capacity (16) and load factor (0.75).
* 底层会调用父类的构造方法,构造一个带默认初始容量16和加载因子0.75的LinkedHashMap实例
*/
public LinkedHashSet() {
super(16, .75f, true);
}
/**
* Constructs a new linked hash set with the same elements as the
* specified collection. The linked hash set is created with an initial
* capacity sufficient to hold the elements in the specified collection
* and the default load factor (0.75).
* 底层会调用父类的构造方法,构造一个足以包含指定collection中所有元素的初始容量和加载因子为0.75的LinkedHashMap实例
* @param c the collection whose elements are to be placed into
* this set
* @throws NullPointerException if the specified collection is null
*/
public LinkedHashSet(Collection<? extends E> c) {
super(Math.max(2*c.size(), 11), .75f, true);
addAll(c);
}
集合番@LinkedHashSet一文通(1.7版) 由 黄志鹏kira 创作,采用 知识共享 署名-非商业性使用 4.0 国际 许可协议 进行许可。
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