单项选择题
A.public B.extends C.Float D.static
A.class，float，double，public B.float，boolean，int，long C.char，extends，float，double D.public，private，protected
A.Filterstream B.Filestream C.Randomaccessstream D.Pipdestream
A.BoxLayout B.GridLayout C.BorderLayout D.FlowLouLayout
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