what is api in java

Currently, there are 3 versions of the Java 2 platform, which are Java 2 platform Micro (Java 2 Platform Micro edition,j2me) for small devices and smart cards, Java 2 Platform Standard Edition for desktop systems (Java 2 Platform Standard edition,j2se),

static void Main (string[] args) {Permute ("abc");}public static void Permute (String str) {char[] Strarray = Str.tochararray ();Permute (strarray, 0, strarray.length–1);}public static void Permute (char[] list, int. Low, int.) {int i;if (low = = high) {String cout = "";for (i = 0; I cout + = List[i];System.out.println (cout);} else {for (i = low, I Char temp = List[low];List[low] = List[i];List[i] = temp;Permute (list, low + 1, high);temp = List[low];List[low] = List[i];List[i] = temp;}}}}Simp

is the core of the entire java. To install the JDK see here: How to install and configure the JDKIncludes: Java Runtime Environment JRE, Java Tools (JAVAC/JAVA/JDB, etc.) and Java base Class library (

platform, so what Java so-called cross-platform is to install different JVMs on different platforms, and the. class files generated on different platforms are the same, and the. class file is then interpreted by the corresponding platform JVM as the corresponding platform's machine code execution.Finally, the differen

Kit, a product for Java developers, is the core of the entire java.Want to install JDK see here: [How to install and configure JDK][5][5]:Includes: Java Runtime Environment JRE, Java Tools (JAVAC/JAVA/JDB, etc.) and Java base Cla

Java technology _ Java 0021 _ What is an exception in java?1. What is a java exception? java ha

IO has been one of the core parts of software development, and with the improvement of Internet technology, IO is becoming more and more important. Throughout the development community, the ability to skillfully use IO is important not only for companies but also for developers. Java's IO mechanism is constantly being perfected to cope with increasing traffic.

Anyone who learns Java knows that void means null and is a keyword in java. Initially, when I knew void, it was public static void main (String[]args) {}, I remember when I was in contact with void, I always had no idea what it was, so I asked the teacher, butThe teacher just said void

The first thing to know is what the so-called Java NIO is!IO is transmitted by character or byte, slower! And NiO is a block, it's equivalent to a buffer, a piece ofTransmission, faster！ Multiple threads are also addedControl, a N

What Web Projects do PHP and Java do with thrift, and what Server software is available to run them after communication? Reply content: What Web Projects do PHP and Java do with thrift, and

takeAdvantage of Higher-performance clients and a modern look-and-feel as well as high-level APIs for connecting to networked Data sources. JavaFX applications may clients of Java EE platform services.JavaFX is a platform for creating RIA, similar to the Windows platform Wpf,javafx using hardware acceleration and multimedia engines to better perform performance of high performance clients, and a modern vis

Java basic questions: What are the similarities and differences between runtime exceptions and general exceptions? What is the difference between error and exception? Please write the five most common runtimeexception ?, ThrowableIt is the parent class for

");------------ When the value is =null, a null pointer exception is thrown and the S1.equals ("Sky") is changed to "Sky". Equals (S1) to avoid throwing exceptions6. Empty string and Null difference　　TypeNull represents the value of an object, not a string. For example, declaring a reference to an object, String a = null;"" represents an empty string, meaning tha

service.The official answers to the questions we've revealedBuilt on the Java SE platform, the Java EE platform provides a set of APIs and runtime environments to develop and run large-scale, multi-tiered, scalable, reliable, and secure Web applications.This means that Java EE is:JVM + API + massively + multi-tier + s

Platform service.The official answers to the questions we've revealedBuilt on the Java SE platform, the Java EE platform provides a set of APIs and runtime environments to develop and run large-scale, multi-tiered, scalable, reliable, and secure Web applications.This means that Java EE is:JVM + API + massively + multi

There are 8 basic types of data in Java:Integer type: Byte (8), short (16), int (32), Long (64)Float type: float (32), double (64)Character type: char (16-bit Unicode character)Boolean type: BooleanAuto-unboxing is supported after jdk1.5Auto-Boxing is a conversion of the Java compiler between the base data type and the corresponding object wrapper type. Automatic

What is function responsive programming (Java Android) and function responsive programming (java )?What is function responsive programming (Java and Android) -- Welcome to reprint, ple

Final Class A {}, so that the defined Class A is the final class, the final class cannot be inherited, that is, the code cannot be written, class B extends a {}.final void B () {}, the method defined is the final method, and the final method cannot be overridden in a subclass, that is, if a subclass inherits the class

Original address: http://www.onjava.com/pub/a/onjava/2006/10/04/what-is-java-content-repository.html? Page = 4 JSR-170 defines itself as an independent, standard way to access each other with the content repository. At the same time, it also makes its own definition of the content warehouse. It thinks that the content warehouse

Java learning-What is Servlet and java learning servlet After learning the thirteen J2EE specifications, we just had a simple understanding of them. What we need to do next is to study them in depth. Among the thirteen specifi