Java

1. This week study summary 1.1 summarizes the set and generic related content in the way you like (mind map or other).2. Written work of this job title set collection 1. The deletion of the specified element in list (topic set) 1.1 Experimental

1. This week study summary 1.1 summarizes the set and generic related content in the way you like (mind map or other).Mind Map 1: (Some changes and refinements are made to the collection section.)Mind Map 2: (generic type)1.2 Choose: Collect code

With the recommendation of the new Architecture project of the mic-goo portal, in this process. I have a better understanding of the various APIs in spring, and recently received a request from the leadership, because in the process of each

31. String s = new string ("xyz"); how many stringobject have been created? Can I inherit the String class?Two or one is possible, "XYZ" corresponds to an object, the object is placed in a string constant buffer, and the constant "XYZ" is the one in

Similar to the method of passing function parameters in C + +, Java has 3 kinds of parameter passing methods because there is no concept of pointers in the language system, and there are only two types of java. Here is a little bit of my

Hands on the brain 01SOURCE program:Import javax.swing.*;Class Aboutexception {public static void Main (string[] a){int I=1, j=0, K;k=i/j;Try{K = i/j; Causes Division-by-zero exceptionthrow new Exception ("hello.exception!");}catch

1 PackageCom.xunhuan;2 3 ImportJava.util.Scanner;4 5 Public classZUOYE04 {6 7 Public Static voidMain (string[] args) {8 9Scanner meng00 =NewScanner (system.in);Ten intnum=0;//defining an int variable OneString day=

First, the package of query methods/*** SOLR Query method* @param client SOLR clients* @param query SOLR queries the object* @return List Collection* @throws solrserverexception* @throws IOException*/public static list> Getsolrquery (httpsolrclient

Transferred from: https://www.cnblogs.com/whgk/p/6399262.htmlThis article to the previous article, distance is a bit distant ah, separated by about two months, the middle of the home after a year, haha ~ now start picking up, recently in a personal

Java memory model to mask the memory differences of various hardware and operating systems to achieve cross-platform memory access effects. JLS (Java language Specification) defines a unified memory management model JMM(Java memory model)The Java

Semaphore (semaphore) is used to control the number of threads that are notified of access to a particular resource by coordinating individual threads to ensure reasonable use of public resources.We can understand so semaphore, such as a toilet only

1. This week study summary 1.1 summarizes the set and generic related content in the way you like (mind map or other).2. Written workThis job title set集合1. Deletion of the specified element in list (title of topic) 1.1 Experimental summary. and

Before the interview Baba encounter a relatively simple multithreaded programming problem, that is, "3 Threads Output ADC", the answer is not very good, deeply guilty, decided to learn more carefully "the art of concurrent programming," a book to

Java startup parameters are divided into three categories;The first is the standard parameter (-), all JVM implementations must implement the functions of these parameters, and backward compatibility;The second is the non-standard parameter (- x),

Import Java.util.Calendar;Import Java.util.Date;Import Java.util.GregorianCalendar;public class Zcalendarutils {/*** Take last year's Today* @return*/public static String Getlastyear () {Calendar cal = Calendar.getinstance ();Cal.add (Calendar.year,-

This chapter focuses on how to write a program that defines the size and position of the window on the screen: How to display text in a variety of fonts in a window, and how to display the image three questions unfold.For an excellent application,

1. Find FilesFind/-name filename.txt the filename.txt file under the name lookup/directory.Find. -name "*.xml" recursively finds all XML files2. See if a program is runningPs–ef|grep Tomcat View all processes related to Tomcat3. Terminating a

This week, I learned graphic programming.The basic content is: simple graphics frame construction.Eventqueue.invokelater ((){Simpleframe frame = new Simpleframe ();Frame.settitle ();Frame.setdefaultcloseoperation

Spring-boot uses @ Scheduled to configure Scheduled tasks, Serial scheduled task @ ComponentPublic class ScheduledTimer {Private Logger logger = Logger. getLogger (this. getClass ());/*** Scheduled tasks are executed once every minute to update the

Introduction to the concept and purpose of Java streaming, and introduction to java streaming All Java I/O mechanisms are input and output based on data streams, which represent the flow sequence of character or byte data. Java I/O Stream provides a