core java volume 2

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JDBC Java database connection 2) API for JDBC Interface core

executeupdate (String sql) : performs a static update of the SQL statement (DDL,DML )|-ResultSet executeQuery (String sql) : Static query SQL statement executed (DQL)  |-preparedstatement Interface (subclass of statement Interface): Used to perform precompilation SQL Statement|-int executeupdate () : Perform precompiled update SQL statements (DDL,DML )|-resultset executeQuery () : execute a precompiled query SQL statement (DQL)    |-callablestatement Interface (subclass of PreparedStatement I

Java Core Technology (iv)--Inheritance (2)

asvalues = Size.values();Returns an array containing the element size.small,size.medium,,size.extra_large.(4) The Ordinal method but the position of the enum constant in the enum declaration, where the position is counted from zero, for example Size.MEDIUM.ordinal () returns 1.7. Techniques for succession design(1) Placing public operations and domains in super-class(2) do not use protected domainsThis is because, first, the collection of subclasses

Java Core API--2 (String, StringBuilder, StringBuffer)

/wkiom1vpxdli6rvtaac6ccqzdhe717.jpg "width=" 648 "height=" 481 "alt=" wkiom1vpxdli6rvtaac6ccqzdhe717.jpg "/ > 2. StringBuilder, StringBuffer classWe have learned from the string class that it is an immutable object, so the creation of new objects is thrown whenever the content is modified. So when we have a need to frequently modify the string, this does not only not reduce the memory overhead, the return will increase the memory overhead. To th

Java Core Technology (v)--generic programming (2)

routine to review the concepts that we have described earlierPackage pair3; Public classpairtest3{ Public Static void Main(string[] args) {Manager CEO =NewManager ("Gus greedy.",800000,2003, A, the); Manager CFO =NewManager ("Sid Sneaky",600000,2003, A, the); PairNewPair1000000); Cfo.setbonus (500000); Manager[] Managers = {CEO, CFO}; pairNewPair out. println ("First:"+ Result.getfirst (). GetName () +", Second:"+ Result.getsecond (). GetName ()); Maxminbonus (managers, result); Syste

Java Core Technology point of multi-threading 2

If you want to know a general knowledge of multithreading, you can look at this article first.Changes in each state of the thread.Look at wait.Import java.util.concurrent.arrayblockingqueue;/** * Producer-Consumer * * @author Zzs. * @since 2018/3/24 */public class Blockingqueuetest {private int size = 20; Private arrayblockingqueue  Java Core Technology point of multi-threading

[Weave message Frame] [Java Core Technology] Dynamic Agent application 2

Next how to ImplementFirst step: First, the service class, call method to convert to digital, easy to transferThe second step: Extract meta-information, extraction and three ways, three kinds have advantages, the best way is the first1. Processing when compiling Java2. Program start-up processing, preprocessing3. Call processing, lazy processingStep Three: Encoding interpretationFourth Step: Request methodFifth Step: Distributed supportThe first step:@Target (Elementtype.type) @Retention (retent

How to reduce the U-Core volume

PE volume, in addition to the overall volume, the core volume, in fact, there is one, I call "U-kai Core" volume. The starting speed of PE mainly depends on the "U-Core"

Java Virtual Machine: runtime volume pool, Java Virtual Machine volume pool

Java Virtual Machine: runtime volume pool, Java Virtual Machine volume pool1. Introduction to the runtime frequent pool Runtime Constant Pool, which is part of the method area. In addition to the description of the version, field, method, and interface of the Class, the Class file also contains the Constant Pool Table

Go Language Core technology (Volume I) of 2.2-floating point

from the coordinate system origin (0,0). Drawing is drawn from a distance, so a polygon drawn at a distance may be overwritten by a polygon that is drawn later.The second coordinate system is composed of three-dimensional meshes, coordinates (x, y, z), where Xs and y are linear functions of I and J, the origin is changed to the center point by the translation transformation, and then scaled by Xyrange. Height Z is the value of f (x, y).The third coordinate system is a two-dimensional canvas, st

BlackBerry Application Developer guide Volume 1: Basics-Chapter 2 BlackBerry API

to certain features, such as advanced encryption, synchronization, and additional message APIs are restricted. To use these APIs, you must receive a license from the certification center dedicated to research in motion. For more information, see the BlackBerry Application Developer guide. Volume 1: Basic Volume 2: advanced. Blackberry API packageDescription Net.

Do you know the 21 core technical points of Java ?, Java 21 core technical points

Do you know the 21 core technical points of Java ?, Java 21 core technical points The purpose of this article is to summarize some of my experiences in using java over the years, mainly related to some basic java knowledge points,

Do you know the 21 core technical points of Java ?, Java 21 core technical points

Do you know the 21 core technical points of Java ?, Java 21 core technical points The purpose of this article is to summarize some of my experiences in using java over the years, mainly related to some basic java knowledge points,

UNIX Network Programming Volume 2: interprocess communication

This article is a computer class of high-quality pre-sale recommendation >>>>UNIX Network Programming Volume 2: Interprocess communication (2nd edition)UNIX and Network specialist W. Richard Stevens's masterpieceEditorial recommendationsTwo volumes of "UNIX Network Programming" is the late famous technical writer W. Richard Stevens's masterpiece. Volume

UNIX Network Programming Volume 2: interprocess communication

This article is a computer class of high-quality pre-sale recommendation >>>>UNIX Network Programming Volume 2: Interprocess communication (2nd edition)UNIX and Network specialist W. Richard Stevens's masterpieceEditorial recommendationsTwo volumes of "UNIX Network Programming" is the late famous technical writer W. Richard Stevens's masterpiece. Volume

In-depth study of "TCP/IP details volume 1" Article 2-network layer (I)

One day, when I was restricted by many secular rules and could not do what many normal people could do, I suddenly felt: people should not have come to this world! Since we fell into the ground, we have been destined to suffer a lot in our life... There is always no proper balance between breaking rules and conforming rules. I will still choose to stick to the rules when I think that fox, the female killer in the movie "Assassin's League" (also known as the wanted order), will eventually end the

Java core-Reflection (1), java core-Reflection

Java core-Reflection (1), java core-ReflectionJVM and class:Run java: java class with the main method to start jvm, and load the bytecode --------------------------------------------- when you call the

Java Core Data Structure summary, java Core Data Structure

Java Core Data Structure summary, java Core Data Structure JDK provides a Set of major data structures, such as List, Set, and Map. These structures are inherited from the java. util. collection interface. List Interface List has three different implementations. ArrayList

Java String and String direct volume and String resident pool...

String is one of the core classes in java programming language. It is widely used and widely used.But do you know what is the direct string volume? Do you know there is a string resident pool? The string resident pool can be used to cache the direct string volume. What is a direct

Take you to the Java Multi-threaded series "DAO" Multi-threading advantage and using Util.concurrent packet to test the efficiency of multi-core multithreading under single core

sequential execution of high efficiency, so super-brother Guess only in the multi-core conditions can reflect the high efficiency of multi-threading, in the case of single-core if tinker a multi-threading that is eat full of nothing dry ... Here's an experiment to verify the super-brother conjecture.Experiment: Experimental Environment, computer: HP g42,cpu i3-390, memory 4G Super Brother Poor, no money go

Deep Java core Java memory allocation principle explaining

Deep Java core Java memory allocation principle explainingIntroduction: Stack, heap, Chang, although the same is the Java memory allocation operation area, but its scope of application and function is very different. This article will delve into the Java

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