java examples in nutshell

From the Java reflection mechanism analysis (I) API, we can see many interfaces and classes. What can we do through these interfaces? From the previous API, we can see that it can complete the following functions: 1) obtain the class A. Use getclass () (each class has this function) I. String STR = "ABC "; Ii. Class C1 = Str. getclass (); B. Use class. forname () (static method is most often used) I. Class C1 = Class. forname ("

execution methodIf the reflection is to invoke a private method of the class, the Mehtod object corresponding to the private method is firstCall Setaccessible (True)Class C1 = Testreflection.class;testreflection T1 = (testreflection) c1.newinstance (); Use reflection to createObject of the building classSystem.out.println ("username = =" + T1.username);SYSTEM.OUT.PRINTLN ("Password = =" + T1.password);method = C1.getdeclaredmethod ("Setusername", String.class);Method.invoke (T1, "Learning from

View code 1 Package Org. Apache. hadoop. examples; 2 3 Import Java. Io. file; 4 Import Java. Io. fileinputstream; 5 Import Java. Io. fileoutputstream; 6 Import Java. Io. ioexception; 7 Import Java.net. url; 8 Import Java.net. urlclassl

Java Code examples for Org.apache.commons.codec.binary.Base64InputStream The following are top voted examples for showing. These examples are extracted from open source projects. You can vote up the examples your like and your votes'll be used with our system to product for

W object cannot be produced//so be judged to avoid a null pointer exception if (w! = null) {try {//Close stream resource, need to catch Exception w.close () again; } catch (IOException e) {e.printstacktrace (); } } }}}The contents of the file are written as follows:Reference article: http://developer.51cto.com/art/201309/410902.htmhttp://www.ibm.com/developerworks/cn/java/j-lo-javaio/ Copyright NOTICE:

Java generic deep-Dive: Set utility examples of various Set generics deep-dive, applying anonymous internal classes and internal classes to generics // Sets. javapackage org. rui. generics. set; import java. util. hashSet; import java. util. set;/*** a Set utility * @ author lenovo **/public class Sets {public static

); //here, you can send messages to the server.Channel.write (Bytebuffer.wrap (NewString ("Send a message to the server")). GetBytes ())); //after the connection with the server is successful, in order to receive the information from the server, you need to set the Read permission to the channel. Channel.register ( This. Selector, selectionkey.op_read); //A readable event is obtained}Else if(Key.isreadable ()) {read (key); } } } } /*** Handling events that read informatio

I wrote several call examples: 1, Import org. Apache. axis. Client .*;Import org. Apache. axis. Client. call;Import org. Apache. axis. Client. Service;Import javax. xml. namespace. QNAME;Import javax. xml. rpc. parametermode;Import javax. xml. rpc. jaxrpcexception;Import javax. xml. rpc. servicefactory; Public class testwebservice { /*** @ Param ARGs*/Public static void main (string [] ARGs ){// Todo auto-generated method stubSystem. Out. println ("st

Code examples of four open source systems for processing Word, Excel, and PDF documents in JavaMany people often encounter a problem when using Java for document operations, that is, how to obtain the content of documents such as Word, Excel, and PDF? I have studied and summarized several methods for extracting word and PDF. 1. Use Jacob to Extract files such as Word and Excel. In fact, Jacob is a bridage,

referenceextends t> r = Reallypoll (); if (r! = null) return R; for (;;) {lock.wait (timeout); r = Reallypoll ();...... }} That is, in the execution of a thread, the Monitor of this object is first obtained with synchronized (corresponding tolocked ); When executing to lock.wait (timeout), the thread discards the ownership of Monitor and enters the "Wait Set" queue (corresponding to theWaiting on ）。 5) from the stack information, is the remote references to remote objects is being cleaned u

public class ArraylistExtends abstractlistImplements ListResizable-array implementation of the List interface.Example1. Create a new ArrayList objectNew Arraylist2. Adding elements to themBrands.add ("Jack Amber");3. Complete Example//Beerexpert.java, excerpted from Dawn Griffiths David Griffiths, "Head first Android development",Importjava.util.ArrayList;Importjava.util.List; Public classBeerexpert {Listgetbrands (String color) {ListNewArraylist(); if(Color.equals ("Amber") {Brands.add

Introduction to Pipelines (PipedOutputStream and PipedInputStream), source analysis, and examples In this chapter, we learn about Java piping. Java Piping Introduction In Java, PipedOutputStream and pipedinputstream are pipe output streams and pipe input streams respectively. Their role is to allow multithreading to

time, that is, if notify ()/ Notifyall () is followed by code, and will continue, knowing that the current thread is finished before releasing the synchronized lock object; 3.notify ()/notifyall () after execution, if the right has a sleep () method, will cause the current thread into the blocking state, but the synchronization object lock is not released, still keep their own, then will continue to execute this thread, next to the same 2; 4.wait ()/notify ()/nitifyall () the communication or

Transferred from: http://www.cnblogs.com/lzq198754/p/5780340.htmlProfile:Syntax and examples for Java regular expressions| | Catalogue 1 Match Verification-verify email is correct 2 querying a character or string in a string 3 Common Regular Expressions 4 Regular Expression syntax 1 Match Verification-Verify email is correct Java |Copy

The examples in this article describe the objects and object references in Java. Share to everyone for your reference. The specific analysis is as follows: In Java, there is a group of nouns often appear together, they are "objects and object references", many friends in the beginner Java may often confuse these 2 con

A few examples of Java calling WebService (asmx) 2009-06-28 17:07Several invocation examples were written:1.Import org.apache.axis.client.*;Import org.apache.axis.client.Call;Import org.apache.axis.client.Service;Import javax.xml.namespace.QName;Import javax.xml.rpc.ParameterMode;Import javax.xml.rpc.JAXRPCException;Import javax.xml.rpc.ServiceFactory;public clas

In the near future, we plan to first write some serious things at hand, and then release a few Java game development examples. Then we will go back and tidy up the loonframework project, which cannot be updated for two years ...... Besides, the loonframework-alpha-Dao on the internet is "authentic Alpha", a pure draft (-_-), and only the DaO part is sent ...... When we release 0.2, we can see the changes ..

Python3.5 Language Examples:#coding = Utf-8ImportSYSdefsub_string (b): C=[0]*Len (b) forIinchRange (len (a)): forJinchRange (len (b)):ifSTR (a[i]). Find (str (B[J)))!=-1: C[j]= C[j] + 1 forKinchC:Print(k)if __name__=='__main__': N=Int (Sys.stdin.readline (). Strip ()) a=list () b=list () forIinchRange (N): A.append (Input ()) M=Int (Sys.stdin.readline (). Strip ()) forIinchRange (M): B.append (Input ()) sub_string (A, b)python2.7 instances:#!/usr/bin/

; i if(i >0) {System.out.print(",");}if(paramTypes[i].isArray()) {System.out.println(paramTypes[i].getComponentType().getName()+"[]");}else {System.out.print(paramTypes[i].getName());}}System.out.println(");");}}publicstaticvoidtest02()throwsInstantiationException,IllegalAccessException, SecurityException, NoSuchMethodException,IllegalArgumentException, InvocationTargetException {//反射调用方法，可以通过Method类的invoke方法实现动态方法的调用//public Object invoke(Object obj, Object... args)//第一个参数代表对象//第二个参数代表执行方法上的参数/

About string memory allocation Good blog: http://blog.csdn.net/rj042/article/details/6871030 several examples of string constant pool problems Example 1: Java code String s0= "Kvill"; String s1= "Kvill"; String s2= "kv" + "ill"; System.out.println (S0==S1); System.out.println (S0==S2); The results are: True True Analysis: First of all, we have to know that the result of the Tao