java shape example

Label:JDBC (Java Data Base Connectivity,java database connection) is a Java API for executing SQL statements that provides unified access to a variety of relational databases, consisting of a set of classes and interfaces written in the Java language. JDBC provides a benchmark to build more advanced tools and interface

interface: the interface that the initiator can see. Agree to read the internal state. Initiator role: Create and use a Memo object to save its status owner role: Responsible for saving the memo object. White Box Implementation: The Memo class is also visible to other classes so that the initiator's state may have security issues. Black box Implementation: The memo class as the initiator of the internal class, external to provide an identity interface.public class Testmemento{public static void

system. Key Points of thread sleep 1. The current thread is always suspended when the thread sleep 2. Before being awakened and executed, the actual time for thread sleep depends on the system timer and scheduler. For idle systems, the actual sleep time is very close to the specified sleep time, but for busy systems, the gap between the two is large. 3. The thread sleep does not lose any monitors and locks that the current thread has acquired. 4. other threads can interrupt the sleep of the cur

Idea VM parameter settings 　　 Stack overflow (in fact, recursive call is not finished) Public static void StackOverflow () { stackoverflow (); } Heap Overflow Static class testbean{} /** * heap overflow Java heap space */public static void outOfMemory () { try { while (true) { list.add (new Testbean ())} } Catch (Exception e) {System.out.println (e);}}

Let's take a look at a simple example of JAVA serialization performance-Linux general technology-Linux programming and kernel information. The following is a detailed description. My article EJB tells me how to fall in love with you-commenting on the excellent EJB and EJB, the performance of JAVA serialization is very low, at least the performance of JDK provided

"; }//Get property corresponding to the name of the annotation and the value of the property runtime field[] fields = Cls.getdeclaredfields (); for (Field field:fields) {field.setaccessible (true); Object val = Null try {val = (object) field.get (object); } catch (Exception e) {System.out.println ("Get Fileld value failure"); } Boolean iscolumn = Field.isannotationpresent (Column.class); if (iscolumn) {column ColumnName = (column)

Simple application of the Java NIO socket to the AS3 socket connection application instance of the Java NiO socket to the AS3 socket connection. RAR (9.61 KB, download count: 1691) This from the basic to get up too complex, I got a Mina with flash communication, communication Data mode is datalength+data (data length + data content), for socket byte throttle communication, I used this way, convenient sticky

The java code is as follows: // Listing 33 A Java Code Example // Java // Create new writer document and get text, then manipulate text XComponent xWriterComponent = newDocComponent ("swriter "); XTextDocument xTextDocument = (XTextDocument) UnoRuntime. queryInterface (XTextDocument. class, xWriterComponent ); // Acces

;ImportKafka.javaapi.consumer.ConsumerConnector;ImportKafka.serializer.StringDecoder;Importkafka.utils.VerifiableProperties; Public classKafkaconsumer {Private FinalConsumerconnector Consumer; PublicKafkaconsumer () {Properties props=NewProperties (); //Zookeeper ConfigurationProps.put ("Zookeeper.connect", "192.168.91.231:2181"); //Group represents a consumer groupProps.put ("Group.id", "Jd-group"); //ZK Connection timed outProps.put ("zookeeper.session.timeout.ms", "4000"); Props.put ("Zookee

Original article: Copyright * Copyright 2007 Yusuke Yamamoto ** licensed under the Apache license, version 2.0 (the "License"); * you may not use this file license t in compliance with the license. * You may obtain a copy of the license at ** http://www.apache.org/licenses/LICENSE-2.0 ** unless req Uired by applicable law or agreed to in writing, software * distributed under the license is distributed on an "as is" basis, * Without warranties or conditions of any kind, either express or implied.

View code Package RegEx;Import java. Io. ioexception;Import java. util. RegEx. matcher;Import java. util. RegEx. pattern;/*** Note: matcher is the main operation class of the regular expression. It contains the most important method for extraction and replacement. pattern is not the main class.* Replaceall is used to replace all. replacefirst or replaceend can b

attachment. // You can also use the network // Attachment. seturl (new URL ("http://www.apache.org/images/asf_logo_wide.gif"); attachment. setdisposition (emailattachment. Attachment ); Attachment. setdescription ("attachment description"); // attachment description // The attachment name. If the attachment is a Chinese name, it will be garbled, attachment. setname (mimeutility. encodetext ("test ")); Attachment. setname (mimeutility. encodetext ("attachment name ")); Email. addto ("lushuaiyin