Search results
Results from the WOW.Com Content Network
In object-oriented computer programming, a null object is an object with no referenced value or with defined neutral (null) behavior.The null object design pattern, which describes the uses of such objects and their behavior (or lack thereof), was first published as "Void Value" [1] and later in the Pattern Languages of Program Design book series as "Null Object".
Check that the variable is initialized (without obtaining the lock). If it is initialized, return it immediately. Obtain the lock. Double-check whether the variable has already been initialized: if another thread acquired the lock first, it may have already done the initialization. If so, return the initialized variable.
It can be seen as Java RMIs over web services. JAX-RPC 2.0 was renamed JAX-WS 2.0 (Java API for XML Web Services). JAX-RPC 1 is deprecated with Java EE 6. [1] The JAX-RPC service utilizes W3C (World Wide Web Consortium) standards like WSDL (Web Service Description Language). [2] The core API classes are located in the Java package javax.xml.rpc.
The XQJ API provides Java developers with an interface to the XQuery Data Model. [1] Its design is similar to the JDBC API which has a client/server feel and as such lends itself well to Server-based XML Databases and less well to client-side XQuery processors, although the " connection " part is a very minor part of the entire API.
The official core Java API, contained in the Android (Google), SE (OpenJDK and Oracle), MicroEJ. These packages (java.* packages) are the core Java language packages, meaning that programmers using the Java language had to use them in order to make any worthwhile use of the Java language. Optional APIs that can be downloaded separately.
The Service Data Objects (SDO) API (JSR 235) has a very different objective to that of the Java Persistence API and is considered [7] [8] complementary. The SDO API is designed for service-oriented architectures , multiple data formats rather than only relational data and multiple programming languages.
It is part of the Java Web Services Development Pack. JAX-WS can be used in Java SE starting with version 6. [1] As of Java SE 11, JAX-WS was removed. For details, see JEP 320. JAX-WS 2.0 replaced the JAX-RPC API in Java Platform, Enterprise Edition 5 which leans more towards document style Web Services. This API provides the core of Eclipse Metro.
In computing, a null pointer or null reference is a value saved for indicating that the pointer or reference does not refer to a valid object. Programs routinely use null pointers to represent conditions such as the end of a list of unknown length or the failure to perform some action; this use of null pointers can be compared to nullable types ...