Java

Reference http://book.2cto.com/201306/25434.htmlIn addition, this article is derived from a series: "In-depth understanding of Java Virtual machines: JVM advanced Features and Best Practices (2nd Edition)" http: // book.2cto.com/201306/25426.html

The difference between 1.& and &&Same: Both can be used as logical and (and) operations , and both sides of the operator are true when the expression is true.Different:&& have a short-circuit function, that is, when the first expression is false,

Example12_1.java Public classExample12_1 { Public Static voidMain (String args[]) {//Main Threadspeakelephant speakelephant; Speakcar Speakcar; Speakelephant=NewSpeakelephant ();//Creating ThreadsSpeakcar =NewSpeakcar ();//Creating

Import Java.io.file;import Java.io.fileinputstream;import Java.io.filenotfoundexception;import Java.io.fileoutputstream;import Java.io.ioexception;import Java.nio.bytebuffer;import Java.nio.channels.filechannel;public class Readwritecompare{public

Abstract classanimal{Abstract voidcry (); AbstractString getanimalname ();}classsimulator{voidPlaySound (Animal Animal) {System.out.println ("I am" +animal.getanimalname ()); System.out.println ("My Cry is:"); Animal.cry (); }}classDogextendsanimal{

Example6_5.javaInterfaceSpeakhello {voidSpeakhello ();}classChineseImplementsSpeakhello { Public voidSpeakhello () {System.out.println ("The Chinese are accustomed to greeting: Hello, have you eaten?"); }}class中文版ImplementsSpeakhello { Public

Example5_10.javaclassApe {voidCryspeak (String s) {System.out.println (s); } }classPeopleextendsApe {voidComputer (intAintb) {intc=a*C; System.out.println (c); } voidCryspeak (String s) {System.out.println ("* * *" +s+ "* *"); } } Public

Example10_1.javaImportJava.io.*; Public classExample10_1 { Public Static voidMain (String args[]) {File F=NewFile ("C:\\ch10", "Example10_1.java"); System.out.println (F.getname ()+ "is readable:" +F.canread ()); System.out.println (F.getname ()+

Computable.java Public Interface computable { int MAX = ; int f (int x);}China.java Public class Implements computable { //Chinaclass implements computable interface int number ; Public int f (int// do not forget the Public keyword

Example6_3.javaInterfaceShowMessage {voidDisplays the trademark (String s);}classTVImplementsShowMessage { Public voidDisplay trademark (String s) {System.out.println (s); }}classPcImplementsShowMessage { Public voidDisplay trademark (String s)

Subclasses use super to manipulate hidden member variables and methodsExample5_7.javaclassSum {intN; floatf () {floatSum=0; for(inti=1;i) Sum=sum+i; returnsum; }}classAverageextendsSum {intN; floatf () {floatC; Super. n=N; C=Super. f (); returnc/N;

Java Development to today has formed a complete architecture, mainly divided into three systems, as follows:Java SE--------------------------------------------------------------------java SE(Java platform,standard Edition). Java SE was formerly

public class Inputstreamtest {public static void Main (string[] args) throws IOException {/*** Byte stream* Read the contents of the file* */String st= "D:" +file.separator+ "Java8.txt";File F=new file (ST);InputStream is=new FileInputStream

The so-called input, output, is to remove or move the data into the buffer.The hardware does not have direct access to the user control (JVM). A storage-based hardware device manipulates a fixed-size block of data, and the user requests an arbitrary-

Ftpserver is a subproject of the Apache Mina Project, it implements an FTP server, and VSFTPD is the same kind of product. The FileZilla is a visual FTP server.There are also many FTP clients, such as FILEZILLA,FLASHFXP,SMARTFTP, which only

The constructor is in memory:1 classConsdemo2 {3 Public Static voidMain (string[] args)4 {5Person p=NewPerson ("Zhang San", 12);6 P.sayhello ();7 }8 }9 Ten class Person One { A PrivateString _name; - Private int_age; -

Client.javaImport java.io.*; import java.net.*; import java.util.*; Public classClient { Public Static voidMain (String args[]) {Scanner Scanner=NewScanner (System.inch); Socket Mysocket=NULL; DataInputStreaminch=NULL; DataOutputStream out=NULL;

Thinking logic of computer programs (44), thinking 44 Section 41 introduces HashSet. we mentioned that HashSet has an important limitation and there is no specific sequence between elements. We also mentioned that the Set interface has another

Record exception tuning during tomcat thread creation: unable to create new native thread, tomcat Tuning During a one-time test, the following exception occurs when 300 concurrent requests are detected: HTTP Status 500-Handler processing failed;

[Java daily question] 20161024, java20161024 20161021 for problem resolution, click "Java daily question" 20161024 below today's question to view Package Oct2016; public class Ques1024 {public static void main (String [] args) {int num = 0; for