单项选择题
A.FileOutputStream has no constructors matching the given arguments.
B.An IOExeception will be thrown if a file named "data" already exists.
C.An IOExeception will be thrown if a file named "data" does not already exist.
D.If a file named "data" exists， its contents will be reset and overwritten.
E.If a file named "data" exists， output will be appended to its current contents.
多项选择题 WhichstatementsconcerningtheeventmodeloftheAWTaretrue？（）
单项选择题 What will be the appearance of an applet with the following init（） method？ public void init（） { add（new Button（"hello"））； }
多项选择题 Whichmodifiersandreturntypeswouldbevalidinthedeclarationofaworkingmain（）methodforaJavastandaloneapplication？（）