core java for impatient

Java Core Technology Volume One Java base type Integral type Data Type Number of bytes range of Values Int 4 +_2^4*8-1 Short 2 +_2^2*8-1 Long 8 +_2^8*8-1 Byte 1 -128-127

Java has become a huge and complex technology platform. for developers, it is essential to have a better grasp of Java technology and have a deep understanding of the underlying technical processing details. Here we will introduce four core concepts of java: 1. Java Virtual

Java has become a huge and complex technology platform. for developers, it is essential to have a better grasp of Java technology and have a deep understanding of the underlying technical processing details. Here we will introduce four core concepts of java: 1. Java Virtual

Java has become a large and complex technology platform, for developers, to better grasp the Java technology, in-depth understanding of the underlying technical processing details is essential. Now let's introduce the four core concepts of Java: 1.Java Virtual Machine The

Java core memory allocation principle Reprinted: http://write.blog.csdn.net/postedit Java memory allocation and management is one of the core technologies of Java. We have previously introduced Java memory management and Mem

This article briefly introduces the core applications of the JCE framework! Javax. crypto. CipherThis type provides the password function for encryption and decryption. It forms the core of the Java cryptographic extension (JCE) framework. To create a cipher object, the application callsgetInstanceMethod andConversionTo It. You can also specify the provider name

Java Multithreading Core technology carding (with source) Java Multithreading Core Technology combing the source code Write in front Java multithreading Concurrent access to objects and variables Inter-thread communication Use of l

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

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

Java was originally staged in browsers and client machines. At the time, many people questioned whether it was suitable for server-side development. Now, with the increase in Third-party support for the JAVA2 platform Enterprise version, Java is widely accepted as one of the preferred platforms for developing enterprise server-side solutions. In this article I will explain 13

-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

Java EE was originally in the browser and the client machine. At the time, many people questioned whether it was suitable for server-side development. Now, with the increase in Third-party support for the JAVA2 platform Enterprise version, Java is widely accepted as one of the preferred platforms for developing enterprise server-side solutions. The Java EE pla

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

0000,Which means 128 is 1000 0000 in the computer,The integer.tohexstring parameter is int, and if you do not 0xff, then when a byte is converted to int,Since int is 32 bits, and byte has only 8 bits, this will be the complement.For example, the decimal number of the complement 11111111 is 1 to int when converted to 11111111111111111111111111111111 many 1 ah, hehe!That is 0xFFFFFFFF but this number is wrong, and this complement will cause errors. and 0xFF and after the high 24 bits will be clea