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JavaObject

The type of a wrapped Java object accessed from within JavaScript code.

Core object
Implemented in	JavaScript 1.1, NES 2.0

Created by

Any Java method which returns an object type. In addition, you can explicitly construct a 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.

Parameters

parameterList

An optional list of parameters, specified by the constructor in the Java class.

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