Examples to: Use URL class to parse URLs and download the network resources specified by a URL Use URLConnection class to gain more cntrl over the downloading of network resources Write client programs that use the Socket class to communicate over th…

Language_suport and Other Language-Oriented API: strings,exceptions, threads, #java.lang.* offers the String class to suport strings, the Throwable class to suport exceptions,and the Thread class and Runnable inteface to suport threads.what's more, S…

Java is using Unicode set Java is case sensitive Comments, C/C++ style abstract, const, final, int, public, throw, assert, continue, finally, interface, return, throws, boolean, default, float, long, short, transient, break, do, for, native, static,…

原文:http://tutorials.jenkov.com/java-networking/udp-datagram-sockets.html UDP vs. TCP Sending Data via a DatagramSocket Receiving Data via a DatagramSocket DatagramSocket's are Java's mechanism for network communication via UDP instead of TCP. UDP is…

Java Networking (Java 网络) 1. 网络通信协议 Network Communication Protocols Network Protocol is a set of rules that governs the communications between computers on a network, or rather, rules for sending blocks of data (each known as a Protocol Data Unit (PD…

Java Date and Calendar examples This tutorial shows you how to work with java.util.Date and java.util.Calendar. 1. Java Date ExamplesFew examples to work with Date APIs. Example 1.1 – Convert Date to String. SimpleDateFormat sdf = new SimpleDateForma…

1. A List of Strings to Uppercase 1.1 Simple Java example to convert a list of Strings to upper case. TestJava8.java package com.mkyong.java8; import java.util.ArrayList; import java.util.Arrays; import java.util.List; import java.util.stream.Collect…

上一篇JMX/JConsole调试本地还可以在centos6.5 服务器上进行监控有个问题端口只开放22那么设置的9998端口 你怎么都连不上怎么监控?(如果大神知道还望指点,个人见解) 线上项目出现了org.apache.solr.servlet.SolrDispatchFilter - null:java.lang.RuntimeException: java.lang.OutOfMemoryError: Java heap space 于是采用了在tomcat里面catalina.sh里面…

感谢原作者:Vamei 出处:http://www.cnblogs.com/vamei Java是面向对象语言.这门语言其实相当年轻,于1995年才出现,由Sun公司出品.James Gosling领导了Java的项目小组.该项目的最初只想为家电设计一门容易移植的语言.然而,在获得了Netscape浏览器支持后,Java快速推广,应用广泛. Java受到C和C++的强烈影响. Java与C++相近,都是静态类型,但移除了C++中容易出错的一些特征,比如指针和多重继承.Java的垃圾回收可以自动的…

注:“蓝色加粗字体”为书本原语 先来一张JVM运行时数据区域图,再接下来一一分析各区域功能:   程序计数器 程序计数器(program Counter Register)是一块较小的内存空间,它可以看作是当前线程所执行的字节码的行号指示器.此内存区域是唯一一个在Java虚拟机规范中没有规定任何OutOfMemoryError情况的区域. Java虚拟机栈   虚拟机栈描述的是Java方法执行的内存模型:每个方法在执行的同时都会创建一个栈帧(Stack Frame)用于存储局部变量表.操作数栈.…