httpurlconnection class in java

(); if(Params! =NULL) { for(EntryE:params.entryset ()) {Parambbuilder.append (E.getkey ()). Append ("="). Append (Urlencoder.encode (string.valueof (E.getvalue ()), "UTF-8")). Append (""); } Parambbuilder.deletecharat (Parambbuilder.length ()-1); } //Dataoutputstream.writebytes writes a 16-bit Unicode character in a string as a 8-bit character in the streamout.writebytes (parambbuilder.tostring ()); Out.flush (); Reader=NewBufferedReader (NewInp

Original address: http://blog.sina.com.cn/s/blog_7a27a9bf0100s887.html Sometimes you need to find a certain type of file in your program, such as the need to find all files that have a. java suffix name under the E:\data\file_selector_test directory. In fact, this function can also be implemented, very simple, only need to traverse the directory of all the files, to determine whether the end of the file name string is ".

Why the anonymous intrinsic class parameter must be a final type:1) from the theory of the programming language: The local inner class (i.e., the inner class defined in the method ), because it is inside the method itself (can appear at the formal parameter definition or method body), thus accessing the method of the local variables (formal parameters or local va

Java property file properties common operation tool class, properties tool classFor the java. util. Properties class, we usually only need to achieve the following three learning objectives:1. Understand the properties file, understand its meaning, and create the properties file correctly.2. the

This article introduces the use of the random class of Java common classes, the following is the actual case, no additional text explanation, need to explain I have written in the code comments. Import Java.util.random;public class Random1 {public static void main (string[] args) {//Two constructors of Random R1 =new Random (); Random r2=new random (120);

1. Object-Oriented Programming:The language of object-oriented programming is not only Java, but also:Simula 67 (the first object-oriented language, supports both single-inheritance and certain meanings of polymorphic and partial dynamic binding);Smalltalk (the first language that supports dynamic typing, supports single inheritance, polymorphism, and dynamic binding);EIFFEL (supports multi-inheritance, polymorphism and dynamic binding);C + + (most of

1 Packagetest;2 Importjava.util.Date;3 Public classSuperTestextendsdate{4 Private Static Final LongSerialversionuid = 1L; 5 Private voidTest () {6System.out.println (Super. GetClass (). GetName ()); 7 } 8 9 Public Static voidMain (String[]args) {Ten NewSuperTest (). Test (); One } A}The output is: test. SuperTestAnalysis:super.getClass() 得到的依然是runtime当前类，若要得到真正的父类，需要用super.getClass().getSuperclass()虽然这里写的是super，但其实用this也一样The

Beginner's knowledge of JAVA (2) ---- difference between the String class and the StringBuffer class, javastringbuffer There are two types of String operations in Java: String and StringBuffer (buffer String processing ).The following is a brief description of the differences between the two.Both the String

[Java class set] _ recognition class set and collection interface notes 3. Details Function of Class Set A class set is actually a dynamic array of objects. unlike an ordinary array of objects, the content of the class set o

JAVA learning lesson 30th (Common Object API)-String class: Class Method exercises Intern Method Public class Main {public static void main (String [] args) {String str1 = new String ("asd"); String str2 = str1.intern ();/* The String constant pool has, returns the string. If no string is returned, the System creates

?? We all know that in Java you can use an inner class to place the definition of a class inside the definition of another class, which is an inner class, but the anonymous inner class often makes us feel that it doesn't have a sp

======= subclasses are instantiated by default when the parent class is empty, the constructor is super (), which can be omitted.However, when the parent class does not have an empty construction method, it must call this method in the subclass to instantiate the parent class before the instance class is real.The defau

Java Study Notes-Shang Silicon Valley 0918 class Li Jianchao: After a solid journey, you can go to your desired future. In 0918 class Li JianchaoWith the ignorance of the University and the desire for the world outside the ivory tower, I came to Beijing, Silicon Valley for java training. I have been working for one mon

class reference, and Class.forName is initialized, in addition to being referenced.Package Com.ray.ch12;public class Test {public static void main (string[] args) {class personclass = Person.class; System.out.println (person.id); try {Class personclass2=class.forname ("Com.ray.ch12.Person");} catch ( ClassNotFoundExce

Discover problemsAfter switching to the Mac platform, suddenly want to write a program run under the Mac, think of the Mac comes with Java, will be much easier. But in the process of encountering trouble:Always prompt for "error: The main class could not be found or could not be loaded "Engineering structureLooked for a long time, finally found the prototype, found on the internet a lot of information is n

The java test class calls the LDAP server client information for addition, deletion, modification, and query, and the test class ldap The user information configured by the client is called by the self-written java test class as follows: Package com; import