head first java 2

a Java language overviewJava is an object-oriented programming language that can compose cross-platform applications. Java technology has excellent versatility, efficiency, platformPortability and security, widely used in PCs, data centers, game consoles, science supercomputers, mobile phones and the internet, with the world's largestProfessional community of developers.Java is made up of four aspects:(1) T

Java classic 23 design modes: creative mode (2) This article records the remaining two types of five creation modes: Builder mode and PROTOTYPE mode ). 1. Builder mode (alias: builder Mode) Separates the construction of a complex object from its representation, so that different representations can be created during the same construction process. A complete builder model includes the following concepts: 1.

Clientsocket=NULL; Try { //Create a client socket to connect to the serverClientsocket =NewSocket ("127.0.0.1", 36000); //read the traffic sent by the service sideinput =NewDataInputStream (Clientsocket.getinputstream ()); String FileName=Input.readutf (); LongFileSize =Input.readlong (); System.out.println ("received the server sent over the file, the file name is called:" + filename + ", the file size is:" +fileSize); //to read a file into a localString Savepath = "E:\\just a test.

tool, but also very complex, which takes into account a lot of logical implementation, so in later chapters always try to introduce the characteristics and implementation of AQS. This section mainly introduces some theoretical backgrounds and related data structures, and in the next section we will look at how Lock.lock/unlock is implemented based on the above knowledge.Resources:(1) Reentrantlock Code Anatomy of Reentrantlock.lock Reentrantlock code anatomy reentrantlock.unlock Reentrantl

1. System properties added by default on the application serverNetBeans Create Java Web Project (ctxtest) (index.jsp)@page Import="java.util.Properties"%>@page ContentType="text/html"pageencoding="UTF-8"%>DOCTYPE HTML>HTML> Head> Metahttp-equiv= "Content-type"content= "text/html; charset=utf-8"> title>JSP Pagetitle> Head> Body> Table

to indicate that an exception is thrown and handled by the statement in the method bodyThe throws statement is used after the method declaration to indicate that the exception is thrown, and is handled by the statement in the previous-level method that called the methodThrows primarily declares that this method throws this type of exception so that other places call it when it knows to catch the exception.Throw is a specific action that throws an exception, so it is throwing an exception instan

Problem Description:You are given, linked lists representing, and non-negative numbers. The digits is stored in reverse order and all of their nodes contain a single digit. ADD the numbers and return it as a linked list.Input: (2, 4, 3) + (5, 6, 4)Output: 7, 0, 8Problem Solving Ideas:Set up a head listnode and tail listnode, two lists start from the beginning, 22 add and set the carry carry, if the sum of m

Recommendation book: Java Concurrent programming combat, in-depth understanding of Java Virtual machine, big talk design mode HashMap working principleThe difference between HashMap and Hashtable.1, HashMap is non-thread-safe, Hashtable is thread-safe.2, HashMap the key and value are allowed to have a null value exists, and Hashtable is not.3, because of the prob

protocols that communicate with each other between objects. Interfaces play an important role in inheritance.An interface defines only the methods to be used for derivation, but the concrete implementation of the method depends entirely on the derived class.Java source program differs from compile-time operationAs shown in the following:The next section describes the classes and objects in Java programming. You will then have a clearer idea of the cl

Prior to Java 2, the runtime security model used a very tightly constrained sandbox model (sandbox). Readers should be familiar with the Java untrusted Applet code that provides runtime security checks based on this tightly restricted sandbox model. The essence of the sandbox model is that any locally run code is trusted and has full permissions to access critica

In this paper, according to the "Big talk Data Structure" a book, the implementation of the Java version of the single-linked list .The linear table abstract data type definition in the book is as follows (page 45th):Implementation program:Package linklist;/** * Description: * 1. There is no linear table length in the big talk data structure, but it refers to the data field that can be stored in the head no

[Body] Data communication is a very active and popular application field of computer and information technology. A large communication company has developed a major support platform for its business. Here, we simply call it the "communication information service platform", which is used to carry out data services nationwide and globally. This platform is a typical Java technology applied to Internet projects. As a technical backbone of the information

Java basic knowledge study notes (2)Java basic programming structure 1 a simple java example public class FirstExample{ public static void main(String[] args){ System.out.println("we will not use 'hello world' "); }} What do we know from this program?1. java is

never use a for loop to traverse a linked list with very little efficiency. Each time you look for an element to start the search again from the head of the list, the LinkedList object does not do anything to cache location information at all.The list iterator interface also has a method that can tell the index of the current position. In fact, because a Java iterator points to a position between two eleme

In fact, now the official has changed the name of Java EE, refers to the Java Enterprise Edition. The Java EE is specifically targeted at the 2 version of the Enterprise Edition, because of the great influence at the time, shouted accustomed to have been used down.Official explanations are here:Http://www.oracle.com/te

Java multithreaded--jdk and contract (2) thread poolAfter using the thread pool, the creation thread becomes the free thread from the line constructor, and the shutdown thread becomes a bad thread to the thread pool.The JDK has a executor framework, which presumably includes members of executor, Executorservice, Abstractexeccutorservice, Threadpoolexecutor, and executors, located in java.util.concurrent The

20165318 2017-2018-2 "Java Program design" Sixth week study summary teaching Contents study Summary Eighth chapter common practical Class 1, String class The string class is used to process character sequences, and in the Java.lang package, the program can use the string class directly. It is important to note that Java declares the string class as the f

A struct variable, can only do two kinds of operations,Overall reference (assignment, parameter passing)or Access members (point arithmetic-address mode simplification, address mode) (see the Last picture)Case million:Conclusion: Class node in Java, node p; P is the entity itself, and the P pointer operates directly between nodes.and c inside the struct Lnode *p can only be indirectly to operate a node is not this node of the nativeC-Operators directl

Soon, a semester will be over, and Java learning is basically over. This week the teacher also lead us to review again, more than 700 pages of the book, although not just school so terrible, but think of the exam, the head is still big. Basic knowledge of Java basically mastered, but the problem is all out in the programming, simple some of the good, a little mor

, which is an integer type, but there is no Boolean operation in the C language. For each in Java is a simplified form of a for statement, and he is handy, and the code looks simpler than it used to be. Java's input and output is also very different from the C language, but Java is more flexible and there are many types of output.This week we learn data types, operators, variables, string operations, input