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摘要： super不是对象的引用，只是一个指示编译器调用超类方法的特殊关键字 使用super调用构造函数的语句必须是子类构造函数的第一条语句 （e在Employee数组的for each循环中）多态和动态绑定 is-a，替换法则，里氏法则 可能staff[i]引用了另一个不是manager的子类，这样就乱套 阅读全文

摘要： 包 使用包的作用：确保类名的唯一性没有在源文件中放置package语句，则这个源文件中的类就被放置在默认包中。默认包没有名字 权限控制：默认的类，方法或者变量可以被同一个包中的所有方法访问 由于类中的变量在不加权限的情况下可以被包中的其他类看见，所以必须显式地添加private (这地方可使用通配符 阅读全文

摘要： array 阅读全文

摘要： public class Test{ public static void main(String[] args) { System.out.println("I am testing"); //how to use substring api String s = "abcde"; System.out.... 阅读全文

摘要： Introduction Under some circumstances, it is useful for a client or server to become aware of the termination or loss of connection with its peer. In 阅读全文

摘要： Standard TCP When fast retransmit is invoked because of receipt of a third duplicate ACK (or other signal, if conventional fast retransmit initiation 阅读全文

摘要： Slow Start The slow start algorithm is executed when a new TCP connection is created or when a loss has been detected due to a retransmission timeout 阅读全文

摘要： Introduction Congestion control is a set of behaviors determined by algorithms that each TCP implements in an attempt to prevent the network from bein 阅读全文

摘要： Urgent Mechanism Difference between push and urgent flags in TCP https://stackoverflow.com/questions/9153566/difference-between-push-and-urgent-flags- 阅读全文

摘要： Example We create a TCP connection and cause the receiving process to pause before consuming data from the network. This arranges for the receiver to 阅读全文