Java

1. String Array sorting: String [] reallist =... // Sort by alphabetAlphabetcompare AC = new alphabetcompare ();Arrays. Sort (reallist, AC ); Public class alphabetcompare implements comparator { @ OverridePublic int compare (string str1,

[Java class set] _ set interface notes Objectives of this chapter: Understanding the relationship between the set interface and the collection Interface Common subclasses of the Set interface: treeset and hashset Collection has now learned

Serversocket = new serversocket (1111); Socket socket = serversocket. accept (); While (true) {// keep a persistent connection try {thread. sleep (100); // wait time} catch (interruptedexception E1) {e1.printstacktrace ();} If (socket! = NULL) {try {

In a multi-threaded program, if a shared file is to be accessed or edited, how can I read and write files in the exclusive mode?   Using java. NiO. channels. filelock is a good method. The idea is to first create a file named genfile. LCK,   The

The first class smtpauth:   import javax.mail.Authenticator;import javax.mail.PasswordAuthentication;public class SmtpAuth extends Authenticator {private String username, password;public SmtpAuth(String username, String password) {this.username =

Some time ago, the company developed a back-end management system for feinar travel network. My colleagues and I were the first to truly participate in such large-scale project development. During the development process, we have also encountered

After using Jad decompilation, Java class occasionally encounters some abnormal code, such as label0: _ L1 missing_block_label_30, JVM instr RET 7, and JVM instr tableswitch 1 3: default 269, JVM instr monitorexit, and JVM instr monitorenter are

After using Jad decompilation, Java class occasionally encounters some abnormal code, such as label0: _ L1 missing_block_label_30, JVM instr RET 7, and JVM instr tableswitch 1 3: default 269, JVM instr monitorexit, and JVM instr monitorenter are

Dynamic proxy is such a class: it is the class generated at runtime, you must provide a set of interfaces to it when generating it, then the class declares that it implements these interfaces. Of course, you can use the class instance as any of

1. In Java, char is a two-byte string that can store one word... Char A = 'zhao '; Uses unicode encoding... When char is computed in Java, it is treated as an integer corresponding to the ASCII code... 2. Java is very accurate. The precision is

Introduction: We usually have a phone book to record the phone numbers of all our friends. However, if a friend often contacts us, we can remember that the phone numbers of those friends do not need to be translated. However, if we haven't been in

March 12, 2002 The Java technology platform should have provided non-blocking I/O mechanisms for a long time. Fortunately, Merlin (JDK 1.4) has a magic wand that applies in almost every scenario, and the blocking state of the blocked I/O is

Package COM. netcode. date; import Java. text. dateformat; import Java. text. parseexception; import Java. text. simpledateformat; import Java. util. calendar; import Java. util. date; import Java. util. gregoriancalendar; import Java. util.

I have made some optimizations on the memory usage of the program recently, and have achieved good results. I have summarized some experiences. I believe it will be helpful for you to write high-quality programs. The following discussion is not

First, RMI is integrated in Spring: Http://blog.csdn.net/partner4java/article/details/7285055 Then, we will write a helloworld separately, which is divided into several steps.1. Interface Definition. You need to implement remote2. Implementation3.

[Common Java class libraries] _ large number operations (bigintger, bigdecimal) Objectives of this chapter:You can use biginteger to operate large integers. Big Data operations. Normally, the next integer can only be placed in the long type, but if

Http://blog.csdn.net/leeyu35/article/details/7755304 1. Static Method: Member variables are dividedInstance variablesAndStatic variables. Instance variables belong to a specific instance and must exist only after class instantiation. Different

Sometimes you need to sort the elements in the logarithm group. Of course, you can write a proper sorting method by yourself, but since the Java package contains the arrays. Sort sorting methodWhy not use an array with few elements? Sorting an array

// Clientframe. Java Import java. AWT. borderlayout;Import java. AWT. event. actionevent;Import java. AWT. event. actionlistener;Import javax. Swing .*;Public class clientframe extends jframe implements actionlistener {Jbutton sendbutton;Jtextfield

Java operators can be classified into four types: Arithmetic Operators, Relational operators, logical operators, and bitwise operators. 1. Arithmetic OperatorsJava Arithmetic Operators include unary operators and binary operators. The unary operator