java learning day19 - List collection

List collection

　　　　He said today Collection set of a subclass : List collection

 

　　　　Some operations are basically the same, interested students Collection List collection and a collection of his father can go and see my last blog

　　　　

 

 

　　　　The difference is that the Collection, List collection added an index value of operations, the value of the index is from zero , the (content index value added) variable name .add

　　　　

　　　　

 

　　　　List of several implementations like ArrayList, LinkedList and Vector

　　　　The three implementation class only Vector is thread-safe of

　　　　ArrayList is mainly used to query

　　　　LinkedList is mainly used to operate the new and delete

　　　　LinkedList can mimic the stack (last out): variable name .push (), the variable name .pop ()

　　　　　　　　　Can simulate Queue (FIFO): variable name .offer (), the variable name .poll ()

　　　　

　　　　

　　　　Focus here is the difference between ArrayList and LinkedList

　　　　See: https: //www.cnblogs.com/javaisbest/p/11795444.html