fantasticmao

package java.util;

......

// LinkedHashMap 类继承自 HashMap
public class LinkedHashMap<K,V>
    extends HashMap<K,V>
    implements Map<K,V>
{
    // LinkedHashMap 内部节点，继承 HashMap.Node 类

fantasticmao

package java.util;

......

public class Hashtable<K,V>
    extends Dictionary<K,V>
    implements Map<K,V>, Cloneable, java.io.Serializable {

    // Entry 数组，每个 Entry 节点都是一个 LinkedList
    private transient Entry<?,?>[] table;

fantasticmao

package java.util;

......

public class HashMap<K,V> extends AbstractMap<K,V>
    implements Map<K,V>, Cloneable, Serializable {

        // Node 数组的默认容量
        static final int DEFAULT_INITIAL_CAPACITY = 1 << 4;