Java

The purpose of Java generics:versatility, which can be applied to multiple types rather than to a specific interface or class. JAVA1.5 's supplement. used to specify what type of object the container is to hold, and the compiler guarantees the

Java NiO non-clogging technology is actually to take the reactor mode, or the Observer mode for us to monitor the I/O port, if there is content in, will automatically notify us, so that we do not have to open multiple threads death, from the outside

The Java object array is a little different from the normal array. Actually, the bottom-up principle is the same. We use object arrays to remember to create objects or to report null pointer exceptions,I've met twice and wasted a lot of time. Now,

Author: ChingOriginal address: http://blog.csdn.net/qingdujun/article/details/39367655This article demonstrates, tread multi-threaded deadlock, simple analysis of the cause of the deadlock, and show a deadlock of the small demo.1) Cause of deadlock2)

　　 Packageday20140918;Importorg.junit.Test;/** As a result of yesterday's interview asked a singleton mode * Review * single-case design mode **///a hungry man, class one load exists, thread-safeclasssinglee{//define a private member for easy

In the default JPanel, the FlowLayout layout is usedHere is the definition in the API:JPanel (Boolean isdoublebuffered)Creates a FlowLayout new with and specifies a buffering policy JPanel .FlowLayout The layout Manager displays components, the

1 PackageCom.zhangcy.test.init;2 3 Public classBase {4 5 intstr;6 Static intVal1=1;7 Final intval2=2;8 Static Final intVAL3 = 3;9 Ten PublicBase (Final ints) { One printstr (); ASystem.out.println ("Pre-base:" +str);

Java-Android learning (Third Day) Android program entry point In the first day,⑤ Program entry point.I mentioned the program entry point, but it is general, Here, let's talk about it again: The AndroidManifest. xml file contains the following

Simple implementation of dictionary tree The Trie tree, also known as the dictionary tree, is a tree structure, a variant of the hash tree, and a multi-Cross-tree data structure for quick search. Stores a large number of strings. The advantage is

Judge whether the string is Chinese or English Import java. util. regex. Matcher; import java. util. regex. Pattern ;/***** ClassName ShowChineseInUnicodeBlock *** Description provides an idea to determine whether a string is Chinese or English ****

Java. util. concurrent package source code reading 25 Fork/Join framework Fork and Work-Stealing (rewrite), java. util When I wrote the previous two articles 23 and 24, I had a lot of details that I was not very clear about. This article reorganized

Create, initialize, search, delete, insert, and merge sequence tables This article was written by referring to the data structure of the national excellent course Geng Guohua, and found some problems in the book, and made some simple corrections to

Java exception Mechanism Java exception Mechanism I have nothing to do after work. Let's take a look at the basic java knowledge and make a summary. Exception mechanism: a control process solution provided by java to solve emergencies or

Java multithreading --- Thread. join Introduction I haven't written a blog for a long time, and I have never had time to go to work before. But I always feel that writing a blog is a good way to record my technical process. So after I resigned, I

Java multithreading-daemon Daemon, as its name implies, is a process that runs silently in the background. when no other process runs on the JVM, the most typical column is The garbage cleaner provided by JVM is used to clean up memory garbage when

Java. text. NumberFormat NumberFormatIs the abstract base class of all numeric formats. This class provides interfaces for formatting and parsing numeric values.NumberFormatSome methods are provided to determine which language environments have

Data structure (2) Application of linked listA linked list is a basic data structure that is an appropriate type of data in the abstract data structure of the Collection class. Unlike the numeric structure, it is easier to insert or delete elements

Supermap iserver client space query Association attribute filtering example Click to query and filter sample code based on Attribute Conditions // Associate the External table Var joinItem = new SuperMap. REST. JoinItem ({ForeignTableName:

ScaleType attribute of ImageView ImageView is often used: ImageView attributes android: scaleType, that is, ImageView. setScaleType (ImageView. ScaleType. fitCenter) Android: layout_width = "60dp" Android: layout_height = "60dp"

JAVA 11th (inheritance)Inheritance: (extends)Many classes, but some members are repeated. To provide reusability, duplicate code is extracted, and inheritance is applied.1. Improved code reusability 2. Relationship between classes,Inheritance