Learning about the Java Collection framework

This section summarizes the Bi Xiangdong Teacher's public lessons from the Preach Intelligence podcast, thanks to Bi Xiangdong teacher! If there is a mistake, you are welcome to advise!

common methods for Collection collections:

Add, delete, size, include (, include all), empty, empty, iterate, and overlap;

Boolean Add (E o);  Boolean remove (Object O);  int size ();  Boolean contains (Object O);  Boolean isEmpty ();  void Clear (); Iterator<e> Iterator ();

Boolean AddAll (Collection c);  Boolean retainall (Collection c); Boolean RemoveAll (Collection c);

common methods for set collections:

with the the Collection collection has the same method;

common methods for List collections:

In the list collection method, the index parameter (the corner mark) is the new method, the operation with the angle mark is the array principle;

In addition to inheriting The methods of Collection collections, as well as the following own unique methods, are related to indexes (subscripts):

Add, delete, modify (can only be modified, not insert), find (get) elements, find the location of the element (two);

void Add (int index, e e);  E Remove (int index);  e Set (int index, e e);  E get (int index);  int indexOf (Object o); int lastIndexOf (Object o);

common methods for MAP collections:

Add, delete, modify, find (get), size, include, empty, empty, iterate

V put (k K, v v);  V Remove (Object k);  The put () method also modifies the function V get (Object k);  int size (); Boolean ContainsKey (Object k);

Boolean containsvalue (Object v);  Boolean isEmpty (); void Clear ();

Learning about the Java Collection framework