This guide helps developers migrate Java applets, standalone applications, Java Web Start applications and development tools from version 1.3 and 1.4 of the Java platform to version 5.0.
Tutorial Details:
1.1.1 MouseEvent.MOUSE_LAST
As of 1.4, the value of static final field MOUSE_LAST in class java.awt.event.MouseEvent changed to
507. In previous versions, the value was 506.
Because compilers hard-code static final values at compile-time, code that refers to MOUSE_LAST and that
was compiled under 1.3 retains the old value. Such code needs to be recompiled to work properly in 5.0.
1.1.2 AWT Focus Changes
Most developers of AWT 1.3 applications saw incompatibilities when migrating to 1.4, so it is a good idea to verify
the focus-behavior of your 1.3 applications in 5.0. The general issues are summarized here; windows-specific
issues are in the next section. For details on these issues and the architecture changes that led to them, see
The AWT Focus Subsystem.
1. The default focus traversability for all Components in 5.0 is true. Previously, some Components (in particular,
all lightweights), had a default focus traversability of ‘false’.
Note: Despite this change, the DefaultFocusTraversalPolicy for all AWT Containers preserves the
traversal order of previous releases.
2. A request to focus a non-focus traversable (i.e., non-focusable) Component is denied in 5.0. Previously, such
requests were granted.
3. In 5.0, Window.toFront() and Window.toBack() perform no operation if the Window is not visible.
Previously, the behavior was platform-dependent.
4. Focus traversal keys (in most cases this means the TAB key) are now consumed, which can cause problems if
a program depends on a key listener being notified of these key events. Previously, AWT components saw these
events and had an opportunity to consume them before AWT initiated focus traversal. To avoid focus traversal
keys being consumed.
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