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: http://www.arcetri.astro.it/irlab/doc/library/javascript/clientreference/javobj.htm
Дата изменения: Thu Oct 7 13:13:36 1999 Дата индексирования: Sat Dec 22 14:24:02 2007 Кодировка: Поисковые слова: п п п р п р п р п р п р п р п р п р п р п р п р п р п р п р п р п р п р п р п р п р п р п р п р п р п р п р п р п р п р п р п р п р п р п р п р п |
JavaObject using the object's Java constructor with the Packages keyword:
new Packages.JavaClass(parameterList)where JavaClass is the fully-specified name of the object's Java class.
parameterList | An optional list of parameters, specified by the constructor in the Java class. |
JavaObject object is an instance of a Java class that is created in or passed to JavaScript. JavaObject is a wrapper for the instance; all references to the class instance are made through the JavaObject.
Any Java data brought into JavaScript is converted to JavaScript data types. When the JavaObject is passed back to Java, it is unwrapped and can be used by Java code. See the Client-Side JavaScript Guide for more information about data type conversions.
JavaObject also inherits methods from java.lang.Object and any other superclass.
JavaObject theString, which is an instance of the class java.lang.String:
var theString = new Packages.java.lang.String("Hello, world")
Because the String class is in the java package, you can also use the java synonym and omit the Packages keyword when you instantiate the class:
var theString = new java.lang.String("Hello, world")
Example 2. Accessing methods of a Java object.
Because the JavaObject theString is an instance of java.lang.String, it inherits all the public methods of java.lang.String. The following example uses the startsWith method to check whether theString begins with "Hello".
var theString = new java.lang.String("Hello, world")
theString.startsWith("Hello") // returns true
Example 3. Accessing inherited methods.
Because getClass is a method of Object, and java.lang.String extends Object, the String class inherits the getClass method. Consequently, getClass is also a method of the JavaObject which instantiates String in JavaScript.
var theString = new java.lang.String("Hello, world")
theString.getClass() // returns java.lang.String
JavaArray, JavaClass, JavaPackage, Packages
Last Updated: 05/28/99 11:59:41