集合类之间的关系总结

Map接口常用的子类:

• HashMap:

extends AbstractMap<K,V>  implements Map<K,V>, Cloneable, Serializable 无序存放,新的操作类,key不允许重复

• Hashtable:

extends Dictionary<K,V>implements Map<K,V>, Cloneable, java.io.Serializable无序存放,旧的操作类,key不允许重复

• TreeMap:

extends AbstractMap<K,V> implements NavigableMap<K,V>, Cloneable, java.io.Serializable可以排序的Map集合,按集合的key排序,key不允许重复

• WeakHashMap:

 extends AbstractMap<K,V>implements Map<K,V>弱引用的Map集合,清除集合中不再使用的内容,使用gc进行回收

• IdentityHashMap: 

extends AbstractMap<K,V> implements  Map<K,V>, java.io.Serializable, Cloneable可以重复的Map集合

public interface Map<K,V>

 WeakHashMap<K,V> extends AbstractMap<K,V> implements Map<K,V>

public abstract class AbstractMap<K,V> implements Map<K,V>

public abstract class AbstractMap<K,V> implements Map<K,V>

public abstract class AbstractSet<E> extends AbstractCollection<E> implements Set<E>

HashSet<E>  extends AbstractSet<E> implements Set<E>, Cloneable, java.io.Serializable

 LinkedList<E> extends AbstractSequentialList<E>implements List<E>, Deque<E>, Cloneable, java.io.Serializable

public abstract class AbstractSequentialList<E> extends AbstractList<E>

 HashSet<E> extends AbstractSet<E> implements Set<E>, Cloneable, java.io.Serializable

public abstract class AbstractSet<E> extends AbstractCollection<E> implements Set<E>