learn core java

How to Learn java step by step and java step by step We must have our teacher and keep learning our life. Here we encounter fate. I hope you can read this article. You are also welcome to leave a message to discuss it, you can also move your finger to forward your favorites. Thank you! We all know that java is not very

analysis and Design (ooa/ood), involving patterns (GOF,J2EEDP), and integrated patterns. You should have a great understanding of UML, especially Class,object,interaction and Statediagrams.2. You need to learn the basics of the Java language and its core class library (collections,serialization,streams,networking, Multithreading,reflection,event, Handling,nio,lo

The ClassLoader is responsible for loading the. class file (possibly on disk, possibly on the network) into memory and generating the corresponding Java.lang.class object for it.Introduction of Class LoaderOnce a class is loaded by the ClassLoader to generate an java.lang.class instance in memory, the same class is no longer loaded.Unique identity of the class: In the Java language, a class is uniquely identified with its fully qualified name, but in

To JAVA beginners + how to learn JAVA-general Linux technology-Linux programming and kernel information, the following is a detailed description. 1. Learning a language cannot be blind. It is necessary to clarify the objectives and methods properly. It is a good thing to see that many people want to learn

language Features, object-oriented (encapsulation, inheritance, polymorphism), reflection, generics ... (2) Java Class Library: Core class library, such as Io/nio, network, Utils ... ; Security libraries, JDK, management, and massive third-party class libraries (3) Java Virtual machines: garbage collector, Runtime, dynamic compilation, accessibility, such as JFR

Look back, I entered the Java field has been nearly 15 years, although learning is general, but share my experience, it is estimated that can help you less to go a little detour.EntryI was a C/C + + camp before the 2001, there is a C. and object-oriented foundation, and later went to Java, found that no pointers to Java is really good simple, and

deep understanding of Java Virtual Machine JVM advanced features and Best Practices (second Edition) core notes JAVA Environment: Java Virtual machine Advanced Features:One: Java memory area and memory exceptionA): Run data area 1: Procedure counter (Program Counter Regist

This blog is mainly for the ape friends to recommend a book, "Java multithreaded Programming core technology."The reason to recommend it, mainly because this book is very easy to understand, with examples throughout the book, so that the original concept of abstraction, understanding is no longer abstract.As long as you have a little bit of Java Foundation, you c

Recommendation of Java multi-thread programming Core Technology I wrote this blog to recommend a book "Java multi-thread programming core technology" to yuanyou. It is recommended mainly because it is easy to understand and runs through the entire book as an example, so that the original abstract concepts are not abs

platforms include:WindowsLinuxMacThe file is also very small, which can be decompressed directly at around kb. Supported features include:JD-core and JD-GUI are written in C ++, which is the precondition for the decompilation speed.JD-core does not need JRE.The decompilable version of JD-core is as follows:Jdk1.1.8Jdk1.3.1Jdk1.4.2Jdk1.5.0Jdk1.6.0Jikes-1.22Harmon

The theoretical knowledge is boring, but these are basic skills and may be forgotten after learning. However, when used, we will find that the previous learning is very meaningful, and the learning thread is like this. 1. how to Create a lock? Lock lock = new ReentrantLock (); 2. How to Use the Lock? See the Lock document. The format is as follows: class X {private final ReentrantLock lock = new ReentrantLock ();//... public void m () {lock. lock (); // block until condition holds try {//... met

Look back, I entered the Java field has been nearly 15 years, although learning is general, but share my experience, it is estimated that can help you less to go a little detour.EntryI was a C/C + + camp before the 2001, there is a C. and object-oriented foundation, and later went to Java, found that no pointers to Java is really good simple, and

-daemon threads end, the program ends, the JVM ends, because the thread that needs to be guarded is gone, the daemon thread is not working, so the program ends and the program "Kill" the daemon thread. In layman's terms, the program will not end as long as a non-daemon thread exists in the program.In the Java language, the daemon thread generally has a lower priority, it is not provided only by the JVM, and the user sets the daemon itself when writing

asynchronously, then under what circumstances with the Execute or Submmit method? such as multi-threaded parallel execution, do not need to execute the results returned when the general use of the Execute method, if the need for multi-threading parallel computation, and all need to return the results of the time, need to Submmit method, of course, submmit generally blocking, If you want to retrieve the results at the time set, if you do not get the exception is to set the parameters through the

class does not have a way to modify the strings, if you really want to change them The following expressions are legal The = = operator detects whether two strings are placed in the same position In fact, only string constants are shared, and the results of operations such as + or substring are not shared Issupplementarycodepoint (int codepoint) is a Boolean method of the character class that determines whether the specified character (Unicode code point) i

At present, multi-core CPU is the mainstream. The multi-core technology can effectively leverage hardware capabilities and improve throughput. For Java programs, concurrent garbage collection can be implemented. However, Java uses multi-core technology to bring about some pr

cloud. Micro: 1. You need to be proficient in Object-Oriented Analysis and Design (OOA/OOD), involved models (GOF, J2EEDP), and integrated models. You should be familiar with UML, especially class, object, interaction, and statediagrams. 2. You need to learn the basic knowledge of the JAVA language and its core class libraries (collections, serialization, stream

Have you ever thought of a problem, many computer programming languages, common programming languages have Java,python and so on, before beginning to learn big data will choose to learn Java, that Java is good? Why learn

Classes are loaded:　　Refers to reading the binary data of a class file into the runtime data area (the JVM is partitioned in memory)and creates a class object within the method area.Class Loader:Responsible for loading the compiled class file (bytecode file) into the JVM (Java Virtual machine).The class loader is mainly divided into the following types:1.Bootstrap class loader (boot class loader)Responsible for loading the

JAVA instance-learn how to use java for digital signature-general Linux technology-Linux programming and kernel information. The following is a detailed description. Digital Signature If a java Applet written using an Applet has not been signed, the access to the client program will be subject to security restrictions