单项选择题

Howcanyoucreatealistenerclassthatreceiveseventswhenthemouseismoved？（）

A.ByextendingMouseListener.
B.ByimplementingMouseListener.
C.ByextendingMouseMotionListener.
D.ByimplementingMouseMotionListener.
E.EitherbyextendingMouseMotionListenerorextendingMouseListener.
F.EitherbyimplementingMouseMotionListenerorimplementingMouseListener.

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单项选择题

Whichtypeofeventindicatesakeypressedonajava.awt.Component？（）

A.KeyEvent
B.KeyDownEvent
C.KeyPressEvent
D.KeyTypedEvent
E.KeyPressedEvent

单项选择题

publicclassTest{2.publicstaticvoidmain（Stringargs）{3.unsignedbyteb=0；4.b－－；5.6.}7.}Whatisthevalueofbatline5？（）

A.-1
B.255
C.127
D.Compilationwillfail.
E.Compilationwillsucceedbuttheprogramwillthrowanexceptionatline4.