core java book

callable object, save the returned future object. When no more tasks are committed, call shutdown. Scheduled executionThe Scheduledexecutorservice interface has a method that is designed for scheduled execution or repetitive execution of tasks. The latter two methods implement this interface.Control task groupsThe InvokeAll method submits all objects to a collection of callable objects and returns a list of future objects that represent the solution for all tasks.Fork-join FrameSome ap

[Java Study Notes] Chapter 5 inheritance of Java core technologiesChapter 2 Inheritance Using inheritance, You can construct a new class based on an existing class. Inheriting existing classes is to reuse (inherit) the methods and domains of these classes. You can also add new methods and domains. Reflection.5.1 superclass subclass Use extends to construct a deri

Java -- JDK dynamic proxy core source code parsing, java -- jdk source code 1. First, let's take a look at how to use JDK dynamic Proxy: Public static void main (String [] args) {/*** creates a Bean object that implements the BeanInterFace interface */BeanInterFace bean = new Bean (); /*** create a MyProxy object that implements the InvocationHandler interface an

simple test, that is, do not use the exception to do the program to determine the branch; 2) to properly use the exception hierarchy, throw or capture, to try to use a class that can express a specific purpose, which will have better readability, Do not use throwable at all times, so that the readability is poor, 3) in the detection of errors, "harsh" than laissez-faire better, such as Stack.pop () is the return of NULL better or run out emptystackexception better? The author thinks the latter

IncreaseDeleteThe Remove method allows you to delete a specified element.Find*************************************************HashSet can neither use the index of 0 1 2 3 to determine the value of an element, nor use key to determine the value of an element*********************HashSet like this ["AA", "BB"] grow into such a data structure******************HashMap grow into such {a=123, B=hello}Jsonobject very much like {"A": 123, "B": null} *hashmap* *hashset*

1365.2 Split iterators with fork/join1455.3 Exception 1495.4 Example Description: Recursive grep1555.5 Summary 166Chapter 6th performance of Flow 1676.1 Micro-Benchmark Metric 1706.1.1 Measuring Dynamic Runtime 1716.1.2 Java microbenchmarking Harness1736.1.3 Test Method 1746.2 Select execution Mode 1786.3 Stream Characteristics 1816.4 Sort 1846.5 stateful operation and stateless operation 1876.6 Packing and Unpacking 1886.7 Split iterator Performance

"Original" https://www.toutiao.com/i6594587397101453827/Java Core Data structure (List,map,set) usage tips and optimizationsJDK provides a set of major data structure implementations, such as list, MAP, set and other common data structures. This data is inherited from the Java.util.Collection interface and is located in the Java.util package. 1. List interface The three most important list interface impleme

called and passed to it with the methods object and the original invocation parameters. The calling processor must give a way to call processing.To create a proxy object, you need to use the Newproxyinstance method of the proxy class, which has three parameters:1: Class loader. As part of the Java security model, for system classes and from other classes, you can use a different classloader, currently using the default class loader with null notation

Observer observer the message and the event is one, the difference is that when inheriting Java codeChanges in different ways.The triggers in the database are somewhat like this, but they are not generally compared.Similar to the Django views.py, how does the Web. XML modify the code so that it can map URLs to the actual file address?Set Jsp-file-servlet-name, Url-pattern- servlet-name, to get Url-pattern to jsp-file mappings.I want to change the Web

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

Start learning Java today and learn to use the book as core java. Prior experience with C. Be prepared to record all the ideas, hard-to-understand, and important things that you learn about this book. I hope I can restudying it in retrospect. I also hope that I can insist on

not recommend not knowing when to callPackage import with ingest package is similar to reference namespacePackage = = NamespaceImport = = usingStatic ImportClass Design Tips1) Guaranteed Data privacy2) Initialize the data3) Do not use the base type too much in the class (you can use the aggregation relationship instead)4) Not all domains require separate accessors and converters5) Decomposition of classes with excessive responsibilities6) The class name and method name should be able to reflect

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 the rest of it.Floating-point types have float

Today's early failure, coupled with a busy day overtime work, did not follow the plan to summarize Java-related technology, just see the following article summarizes the good, reproduced. What are the four core technologies of Java? First of all, we need to understand the importance of Java

Over the last one months. Just swallowed the book over. The book is long enough to say 706 pages. I have never been a person who likes to record, have been reading what books have been read to throw aside, may sometimes have so a little want to record down the impulse, but the calculation time is too tight, a lot of youshiwuzhong, after all, research and research program is only a hobby of their own, but di

Java core --- EnumerationI. Create a final-state Season class using enumeration in the form of common classes and set the constructor method to private, because the enumeration value cannot be added at will because the class object cannot be new, therefore, you need to define the member variables and write new in the class so that you can access the enumerated values outside the class by using the static me

Java Multithreading Core technology comb (with source code) Java Multithreading Core Technology comb the source code written in front Java multithreaded objects and variables concurrent access between threads communication lock usage Timer single case mode and multithreadi

　　 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. Mastering core concepts and ideas can help us extrapolate and comprehend by analogy and help us improve our understanding of the entire

advantage. 1.2.8Explanatory typeThe Java interpreter can execute Java bytecode on any machine that has ported the interpreter . There are still some things that I don't understand for the time being (read the book later)1.3 Java applets and the InternetThe idea is simple: users download

I. Introduction of the ContentJava EE's 13 core technologies: JDBC, JNDI, EJB, RMI, JSP, Java Servlet, XML, JMS, Java IDL, JTS, JTA, JavaMail, and JAF.Java was initially in the browser and client machines, when many questioned whether it was suitable for server-side development. Now with the increase in support for third-party