core java 8

Objective:Java 8 corresponds to the JDK version of JDK8, and the official website download back when installed, the folder is written JDK1.8, the same meaning. (and this version of the name is also a regular, and so on)First, Java 51, 1190000004417288Second, Java 62, 1190000004417536Third, Java 71, http://www.eclipse.o

Both "Thinking in Java" and "Core Java" are classic books in Java. It's also a lot of the two books that have just come in contact with Java. Recently, the two books have been properly turned over again. Core

Alas, the front has been skipped, a look at the pure text description on the headache.This section is about Java data types, there are eight basic types, of which the int,short,long,byte four are shaped, is pure numbers, the size is 4,2,8,1 bytes, a byte is composed of 8 01, the highest bit is the sign bit, 0 is an integer, 1 is a negative number, For example, the range of byte is 128 to 127. I don't know t

= table; int newcapacity = Newtable.length; for (int j = 0; J Brief summary对于HashSet及其子类而言，它们采用hash算法来决定集合中元素的存储位置，并通过hash算法来控制集合的大小；对于HashMap、Hahstable及其子类而言，它们采用hash算法来决定Map中key的存储，并通过hash算法来增加key集合的大小。hash表里可以存储元素的位置被称为桶（bucket），通常情况下，每个桶里存储一个元素，此时有最好的性能，hash算法可以根据hashCode值计算出桶的存储位置，接着从桶中取出元素。但hash表的状态是open的：在发生hash冲突的情况下，单个桶会存储多个元素，这些元素以链表形式存储，必须按顺序搜索。HashSet和HashMap的hash表都包含如下属性：- 容量capacity:hash表中通的数量- 初始化容量initial capacity：创建hash表时桶的数量。- 尺寸size：当前hash表中记录的数量- 负载因子load f

classes and packages:java -ea:... -da:MyClass MyAppYou cannot apply a system class that does not have a classloader, to use:-enablesystemassertions/-esaUsing assertions to complete parameter checkingUse the assertion scenario: Assertion failure is a fatal, unrecoverable error Assertions for development and test phases Non-notification of recoverability errors should not be used as a means of informing users of problems.This method is not allowed to be called with a null array,

automatically rendered in the order in which it is sorted. Adding an element to the tree is slower than adding it to the hash table, but it is a lot more than adding the element to the correct location of the array or list. 13. 2. 6 queues and two-terminal queues Queues can make it effective to add an element to the tail and remove an element from the head. A two-head queue, a two-terminal queue, allows people to effectively add or remove elements at the head and tail while adding elements to t

Java terminology Term name Abbreviation Explain Java Development Kit Jdk Software used by programmers who write programs Java Runtime enviroment Jre Software used by users running Java programs Server JRE Software that runs

complete most functions of the field****************An iterator is a design pattern that is an object that can traverse and select objects in a sequence, and the developer does not need to know the underlying structure of the sequence . Iterators are often referred to as "lightweight" objects because they are less expensive to create.The iterator functionality in Java is relatively simple and can only be moved one way:(1) Use Method iterator () "Call

Java operating mechanism the JVM of the core mechanism The JVM is the runtime environment for Java programs The JVM is part of the JRE, it is a fictitious computer, or it can be understood that the bytecode file is interpreted as a machine instruction on a specific platform when the byte code file is executed by the CPU JVM with the byte code as the machine in

, in the programming language, threading can be a love-hate paradox for programmers, which can greatly simplify the model, help programmers write powerful code, and, on the other hand, make our programs appear with a variety of bugs that can be difficult to reproduce in the development environment. Here the author based on the "Java Core technology" book and some Bovinlai to share with you on

To prepare to learn the next Java, according to the "core Java" content, simply made a note. There are many places in this book that compare the syntax of C + + and Java, so it's very advantageous for those who turn from C + + to Java!Javac Xxx.javajava XXXJava Applet:applet

The main content index of this article1. Java Threads2. Threading Model3. Java thread pool4. Future (various future)5. Fork/join Frame6. Volatile7. CAS (Atomic operations)8, AQS (concurrent synchronization framework)9, synchronized (synchronous lock)10. Concurrent queue (blocking queue)This article only analyzes some of the c