Java

The Java reflection mechanism is in the running state, for any class, can know all the properties and methods of this class, for any object, can invoke its arbitrary methods and properties; This dynamic acquisition of information and the ability to

Speaking of threads, it is not possible to mundane the first three concepts to be understood: process, thread, and association. OK, so what is a process, what is a thread, and which is what? Process: The process can be easily understood as running

The WIN10 system uses the Java ping operation, after running the idea console appears in Chinese garbled. There are two lines in the code:Process process = Runtime.getruntime (). EXEC ("ping" + "127.0.0.1");BufferedReader BufferedReader = new

SignificanceThe invocation of an interface is unified into a function, and then a specific instance is called to invoke the appropriate method, acting as a distributorMethod handler, user--DictionaryDynamic: Refers to creating a proxy class when the

In Java, object-oriented is undoubtedly the weight of Java, and today we look at one of the three main features of Java object-oriented inheritance.First, let's look at what the structure of the class is.Classes are primarily member properties,

Loading of classes in Java virtual machines(approximate structure of the JVM)From sending class files to in-memory classes, in order of precedence, there are three major steps that need to be loaded, linked, and initialized.The types of Java

Monthly repayment calculation formula of equal and principal interest:Monthly principal and interest amount = (Principal x monthly rate X (1+ month rate) ^ repayment month) ÷ ((1+ monthly rate) ^ Repayment month-1))Reverse Seeking Moon interest

I. R collect (Supplier Supplier, Biconsumer Accumulator, Biconsumer combiner)Supplier: A way to create an instance of a target type.Accumulator: A method that adds an element to the target.Combiner: A way to combine multiple results from an

Day two, data type 1, Java data type 8The purpose of the data type is to temporarily store the raw information between the raw information and the processing information.There are two main classes of Java: A class of basic data types and an object

Dynamic Agent for JavaProxy modeProxy mode is a common Java design pattern, his characteristic is that the proxy class and the delegate class have the same interface, the proxy class is mainly responsible for the delegate class preprocessing

1. How do I compare strings? with "= =" or equals ()?Simply put, "= =" tests whether the references of two strings are the same, and equals () tests whether the values of two strings are the same. Unless you want to check whether two strings are the

1. Data returned from the front endfunctionGetdatainitbarview () {varUrl= "${contextpath}/customer/findresultbyindicatorcodesandcycletype"; varindicatorcodes=[{"code": "003002003003001", "Type": "4", "Cyclevalue": 4},

A brief introduction to the three classes commonly used in Java for handling strings: 1, Java.lang.String2, Java.lang.StringBuffer3, Java.lang.StrungBuilderAll three things in common: both final and not inherited, primarily in terms of performance

Java Interview Essentials Summary Set2018-08-11Turn from: Java interview key points summary setArticle Directory1.Basic article1.1.Basic1.2.Collection1.3.Thread1.4. lock mechanism 2.  core   2.1.  Datastore   2.2.  cache use   2.3.  Message

1, what is a thread?A thread is the smallest unit that the operating system can perform operations on, which is included in the process and is the actual operating unit of the process. Programmers can use it for multiprocessor programming, and you

Write high-quality code: 151 recommendations for improving Java programs--[78~92]hashmap hashcode should avoid conflict multithreading using vectors or hashtableVector is a multithreaded version of ArrayList, and Hashtable is a multithreaded version

Java when writing multi-thread program, in order to ensure thread security, need to synchronize data , often use two kinds of synchronization is synchronized and re-enter lock Reentrantlock.Similar points:There are many similarities between these

The traditional Java implementation of socket communication is relatively simple implementation, but it is a plug-in I/O stream access, only one thread to complete the current task to start the next thread, unable to resolve the high concurrency;1,

This example needs to use Google's Open source project Zxing's core jar packageCore-3.2.0.jarCan baidu search download jar fileYou can also use Maven to add dependencies Dependency> groupId>Com.google.zxinggroupId>

I. PrefaceThe execution engine of the physical machine is run directly on the physical hardware such as CPU, operating system, instruction set, but for the virtual machine, his execution engine is implemented by himself. The execution engine has a