The Java Tutorials are practical guides for programmers who want to use the Java programming language to create applications. They include hundreds of complete, working examples, and dozens of lessons. Groups of related lessons are organized into "trails".
Java™ SE 6 has resolved modality issues that arose in earlier versions of the platform. The new modality model enables the developer to scope, or limit, a dialog box's modality blocking. In Java SE 6 the behavior of both modal and modeless dialog boxes has been changed so that they always appear on top of both not only of their parent windows and of all blocked windows as well.
The following modality types are supported in Java SE 6:
Modeless type — A modeless dialog box does not block any other window while it is visible.
Document-modal type — A document-modal dialog box blocks all windows from the same document, except windows from its child hierarchy. In this context, a document is a hierarchy of windows that share a common ancestor, called the document root, which is the closest ancestor window without an owner.
Application-modal type — An application-modal dialog box blocks all windows from the same application, except windows from its child hierarchy. If several applets are launched in a browser environment, the browser is allowed to treat them either as separate applications or as a single application. This behavior is implementation-dependent.
Toolkit-modal type — A toolkit-modal dialog box blocks all windows that run in the same toolkit, except windows from its child hierarchy. If several applets are launched, all of them run with the same toolkit. Hence, a toolkit-modal dialog box shown from an applet may affect other applets and all windows of the browser instance that embeds the Java runtime environment for this toolkit.
Additionally, you can set up the modality exclusion mode
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