java digger

This article address: http://www.cnblogs.com/archimedes/p/java-study-note1.html, reprint please indicate source address.1.Java programming languageJava programming language is a high-level language, it uses our familiar words, sentences and other expressions need the computer to do things for us. Most programming languages are compiled or interpreted so that they can be run on the computer.In the

Everyone, while learning Java, mostly use the IDE environment such as Eclipse, but this is not good, and the package access rights, is also a key step of framework control in Java,Only if you really have to master. The relationship between Java files and the package can really grasp the relationship, and help to write a good framework;Less nonsense, first on the

Three Meanings of Java virtual machine:-Abstract specifications-A specific implementation-A running Virtual Machine instance ------------------- Life cycle of the Java Virtual Machine:A Java Virtual Machine instance is responsible for running a Java program.When a Java progr

1, what is programming?Programming is the process of having a computer write program code in a programming language to solve a problem and ultimately get results.In order for the computer to understand people's intentions, mankind must be able to solve the problem of the ideas, methods, and means through the computer can understand the form of telling the computer, so that the computer can be based on the instructions of the person to work one step at a certain task. The process of communication

What are the advantages and disadvantages of 1.1java compared to other languages?First of all, Java is a completely object-facing language compared to C, C + +, although his underlying (runtime library) is developed using C, but does not depend on C, because Java runs in the runtime library support, so the operation efficiency can be closer to the bottom of C, C + + Efficiency will have an impact, but

be handled by the user program itself, so the programs implemented using the user thread are generally more complex, and fewer programs are now using the user thread.Java, the Ruby layer language has used the user thread, and eventually abandoned the use of it. Hybrid implementationsIn a mixed environment, there are both user threads and lightweight processes. The user thread is still fully built into the user space, while the lightweight process supported by the operating system acts as a brid

Java Collection class diagram: 1. HashMap principle, and Hashtable differenceHashMap in Java store elements in the form of key-value pairs (key-value). HashMap requires a hash function that uses the hashcode () and Equals () methods to add and retrieve elements to the collection/from the collection. When the put () method is invoked, HashMap calculates the hash value of the key and then stores the key

First, JDK (Java development Kit)The JDK is the core of the entire Java, including the Java Runtime (Java Runtime Envirnment), a stack of Java tools, and a Java-based class library (Rt.jar). Any

My Java development and learning journey ------> Hill sorting of Java's classic Sorting Algorithm ------ javaI. Shell Sort) Shell Sort is an insertion sorting algorithm named after D. L. Shell in 1959. Shell sorting is also called to narrow down incremental sorting. Ii. Basic Ideas of hill sorting The central idea of hill sortingThat is, grouping data and sorting each group of data. After each group of data is sorted, you can sort all groups by inser

1. Meaning:Save the state of an object (the quantity of attributes), and obtain it when appropriate.2. programming requirements:Only class objects that implement the serializable interface can be serialized. The serializable interface does not define any members. It is only used to indicate that a class can be serialized.3. serialization features:(1) If a class can be serialized, its subclass can also be serialized.(2) member data declared as static and transient cannot be serialized. Because st

Day 1: Industry overview, course system introduction, JAVA development environment, course system java1. JAVA Development Environment 1.1. Understand the Linux operating system 1.1.1. The Origin and Development of Linux Linux originated in 1991 and became popular in 1995. You can see this person next to it. It is called Linux. It is an operating system that he wrote when he was in college, it refers to open

Java Basics--jni Introduction (top)Java? The native interface (Java Native interface,jni) is a standard Java API that enables the integration of Java code with code written in other programming languages . If you want to leverage existing code resources, you can use JNI as a

Java basic notes (3: files and data streams), java data streamsI,Input stream and output stream The input stream loads data from files, standard inputs, or other external input devices to the memory. The function of the output stream is the opposite. Data in the memory is saved to a file or transmitted to the output device. The input stream corresponds to the abstract class

Deep Java core Java memory allocation principle explainingIntroduction: Stack, heap, Chang, although the same is the Java memory allocation operation area, but its scope of application and function is very different. This article will delve into the Java core and explain in detail the knowledge of

1 Overview of this lesson2 Course Overview3 Computer Language Overview4Java Getting Started5JDK Introduction (useful)6 Setting environment Variables (useful)7 writing the first Java programProgram Structure of 8Java9Eclipse Development Tools Overview10 Downloads Eclipse(useful)11Eclipse Development Environment Introduction (useful)12 Creating a Java Project13 Assigning a value to the args parameter of the M

(Note: Please see "in-depth understanding of Java Virtual Machine" Zhou Zhiming, the knowledge point part of the reference Baidu Encyclopedia)General statementThe 1th chapter is divided into two parts: a Java overview and a tutorial to build your own JDK.1 Java OverviewThis paper introduces the overall characteristics of Java