Condition就是实现了管程里面的条件变量。 Java 语言内置编程客栈的管程里只有一个条件变量，而Lock&Condition实现的管程支持多个条件变量。 支持多个条件变量，能让代码可读性更好，实现也更容易。
I noticed that there are two ways to create C++ objects: BTree *btree = new BTree; and BTree btree; From what I can tell, the only开发者_JS百科 difference is in how class objects are accessed (.
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