public class LinkedHashSet extends HashSet {
public LinkedHashSet() {
super(16, .75f, true);
}
}
其中，super 关键字调用的是父类中 "only used by LinkedHashSet" 的构造函数，如下：
public class HashSet {
/**
* 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.
*/
HashSet(int initialCapacity, float loadFactor, boolean dummy) {
map = new LinkedHashMap(initialCapacity, loadFactor);
}
}
在这样的设计下，HashSet 需要额外携带一部分不属于它的代码，实在不够优雅。
hashset, public, linkedhashset, specified
