JPanel与JFrame有啥关系 与不同的

Posted 2023-02-21

参考技术A JFrame是顶级容器，而JPanel是普通容器。包含Swing组件的程序必须包含一个顶级容器，而Swing组件不可以直接加入到顶级容器中。Sun文档有下列相关的解释：1、The
containment
hierarchy
for
any
window
or
applet
that
contains
Swing
components
must
have
a
Swing
top-level
container
at
the
root
of
the
hierarchy.
2、You
don
't
add
components
directly
to
a
top-level
container
such
as
a
Jframe,
and
you
should
add
components
to
a
container
(called
the
content
pane)
that
is
itself
contained
by
the
JFrame.
3、Swing
provides
three
generally
useful
top-level
container
classes:
JFrame,
JDialog,
and
JApplet
至于其他的不同，它们既然是不同的类，自然不同了，可以看看API文档。