Java

The first method I used most of the split split after the end, divided into different arrays, and then get what you want the second method is rarely seen. The third type is used in two parts. .... string replaces the last obtained string has a/n/p,

Introduction to JAVA EXCEL APIsJava Excel is an open source project through which Java developers can read the contents of Excel files, create new Excel files, and update existing Excel files. Using this API non-Windows operating systems can also

First, the introduction question In all data types in the Java language, the string type is a more specific type and is also a point of knowledge that is frequently asked during an interview, and this article combines the Java memory allocation

Import java.util.ArrayList;Import Java.util.Arrays;Import Java.util.HashSet;Import Java.util.Iterator;Import java.util.List;Import Java.util.Set; public class test{Private static string[] s = new string[]{"A", "B", "a"};private static int L =

Package com.iamzken.utils; Import java.text.ParseException; Import Java.text.SimpleDateFormat; Import java.util.Date; public class Dateformattest {public static void Main (string[] args) throws ParseException { // According to the time format

The time slices in Java where the CPU is allocated to each thread are random and many threads in Java are shared by a single resource. For example, trains sell tickets, train tickets are certain, but the window selling train tickets are everywhere,

//data type conversion The basic types in Java are all signed types. The data obtained from the file read stream is a byte array. Some of these values are ASCII values greater than 127, so that the symbol bit goes wrong when converting to a char

Recently responsible for processing a batch of file data, some files are very large ordinary text editor can not open, resulting in the unknown to the encoding. So I want to write a program to judge, share. Principle: By obtaining the first three

1 Overview SOLR is an independent enterprise-class search application server that provides an API interface similar to Web-service. The user can submit a certain format XML file to the Search engine server through HTTP request, generate the index,

Recently in the study of the Android Asynctask source code, found that a lot of Java SE multithreading knowledge, so go back to the JDK documentation Review of Java multithreading related knowledge, make a note easy to find later. Introduction to

public class Testqiantao { /** * Use nested loops to print rectangular triangular parallelogram diamonds separately */ public static void Main (string[] args) { Printrect (); Printsibianxing (); Sanjiaxing (); Lingxing (); } Print

About method overrides in Java: 1, the method in the subclass has the same return type as the method in the parent class, the same method name, the same argument list 2. The access level of a method in a subclass cannot be lower than the access

Package com.example.decript; Import java.io.UnsupportedEncodingException; Import java.security.InvalidKeyException; Import Java.security.MessageDigest; Import java.security.NoSuchAlgorithmException; Import Java.security.SecureRandom; Import

Online search for a long time, and finally found three kinds of good methods: 1, the JDK comes with the package java.util.zip.ZipOutputStream, the deficiency, the file (folder) name with Chinese, There is a garbled problem, the implementation code

Use Linkedblockingqueue in Java to implement producer, consumer mode Linkedblockingqueue implementation is thread-safe, which realizes FIFO (first-in first out) and other characteristics. is the first choice as producer consumers,

Quote Encyclopedia In computer programming, adapter patterns (sometimes referred to as wrapper styles or wrappers) fit the interface of a class to what the user expects. A fitting allows a class that is usually not working together because the

Overview The garbage collection of the current commercial virtual machines uses the "generational collection" (generational Collection) algorithm, which has no new idea but divides the memory into several pieces according to the different life

The recent project needs to convert a byte array to a hexadecimal number, which has been studied for a long time and shared converting between byte arrays and hexadecimal strings /** * Convert byte[] to hex * string. Here we can convert byte to

In the previous article: Java SPI (Service Provider Interface) introduced a brief description of the Java SPI mechanism, and attached a specific demo. Not familiar with the Java SPI students can go to see the article, this article no longer

Original: http://blog.csdn.net/zheng548/article/details/54426947Difference One: API levelsyschronized useThe synchronized can be modified or decorated with code blocks.The synchronized modifies the method as follows:Synchronized modifies a method,