Java

There are now a lot of JSON-related Java tools, such as Json-lib, Gson, and so on, which can convert javabean directly into JSON format.In development, it is possible to get data from the database and want to go directly to the JSON array, not

The project team has often had some unexpected memory overflow problems in development recently. Let me tell you about some of our common memory overflows!1.JVM Heap Overflow: Java.lang.OutOfMemoryError:Java heap spaceThe JVM automatically sets the

Lin Bingwen Evankaka original works. Reprint please specify the source Http://blog.csdn.net/evankakaAbsrtact: This paper mainly discusses the principle and process of memory mapping in Java, compares with the traditional IO, and finally, illustrates

First, the basic conceptThe thread state graph consists of five states1. New state: When the thread object is created, it enters the new state. For example, thread thread=new thread ();2. Ready state (Runnable): Also known as "executable State".

This article transferred from:http://heaven-arch.iteye.com/blog/1160693Transient and volatile two keywords one for object serialization, one for thread synchronization, is a relatively high-level topic in Java, a simple summary.TransientTransient is

The Java reflection mechanism is in the running state, for any class, can know all the properties and methods of this class, for any one object, can call any of its methods and properties; This dynamically acquired information and the ability to

1: Keywords (words that are given a specific meaning by the Java language)(1) Features: all lowercase.(2) Precautions:A:goto and const exist as reserved words.B: High-level notebooks like notepad++ have special color tags on keywords2: identifier

1. read file contents by byte2. read file contents by character3. Read the contents of the file by line4. Random reading of file contentspublic class ReadFromFile {/** * reads files in bytes and is commonly used for reading binary files, slices,

This chapter mainly review the previous contact algorithm,(1) Select the sorting method: In the group of numbers to be sorted, choose the smallest number and the first position of the number of exchanges, and then in the remaining number of the

The "Red" error message appears at the top of the JSP page: the superclass "Javax.servlet.http.HttpServlet" is not found on the Java Build Path. The original Javaweb project class was not added to the Tomcat runtime related classes caused.Here are

Method Definition: A method is a piece of code that can be called repeatedlyFormat:The access modifier returns a value type (which can be void, base data type, reference data type) method name () {Method body}Note: The void return value type does

RMI: Remote method call (invocation). Enables an object on a Java virtual machine to invoke a method on an object in another Java virtual machine as if it were a local object. RMI Remote invocation steps:1, the client object invokes a method on the

The error is as follows:java.net. SocketExceptionSoftware caused connection abort: Socket write error java.net. Socketoutputstream. SocketWrite0 (java.net. Socketoutputstream. Socketwrite (socketoutputstream. Java:java.net. Socketoutputstream.

Final member variableWhen you define a variable in a class, precede it with the final keyword, that is, once the variable is initialized, it is immutable, the immutable meaning is immutable for the base type, and the reference to the object variable

In conjunction with a number of other bloggers ' articles, this article describes the steps to create a MAVEN3-based Java Web Project using IntelliJ idea 14. It also introduces the possible errors and solutions.Environment Introduction:

Recent Projects (Delphi development) require frequent data interaction with systems developed by the Java language (socket communication method), and data encoding conventions using UTF-8 encoding.I do not have the words: the Java system reflects

Compile and run the Eclipse Java project from the Linux terminal If you use Eclipse to develop a Java project in linux, you may need to remotely connect to the project from other places. Maybe you can use teamviewer to remotely connect to the linux

Hibernate entry 01 and hibernate entry 01   I started to study Hibernate today. I 'd like to share my daily notes with you.I hope you can point out something wrong. Don't try it out... Haha. 1. Why learning framework technology2. Concepts of

Design Mode: Template Pattern-conversion, templatepatternTemplate Mode The template method mode defines the skeleton of an algorithm in a method, and delays some steps to the subclass. The template method allows subclass to redefine some steps in

Java Collection framework Overview Recently, I was asked several times about the implementation of HashMap, but the answer is not good. I plan to review the collection framework in JDK and try to analyze its source code. On the one hand, these