摘要： An abstract class can have shared state or functionality. An interface is only a promise to provide the state or functionality. A good abstract class ... 阅读全文

摘要： HashMap usually performs search operations bounded with complexity of O(1)<=T(n)<=O(n). BST performs search operations in O(logN)<=T(n)<=O(N).HashMap ... 阅读全文

摘要： vector is like ArrayList in Java.vector:Continuous memory.Underlying array implementation.Pre-allocate space for future element. This means extra spac... 阅读全文

摘要： 1 /** 2 * The array buffer into which the elements of the ArrayList are stored. 3 * The capacity of the ArrayList is the length of this... 阅读全文