answer 8)

1)compile time error: base cannot be private

a top leve (non nested) class cannot be private.

answer 9)

4) p1 compiles cleanly but p2 has an error at compile time

the package statement in p1.java is the equivalent of placing the file in a different directory to the file p2.java and thus when the compiler tries to compile p2 an error occurs indicating that superclass p1 cannot be found.

answer 10)

2) an error at run time

this code will compile, but at run-time you will get an arrayindexoutofbounds exception. this becuase counting in java starts from 0 and so the 5th element of this array would be i[4].

remember that arrays will always be initialized to default values wherever they are created.

answer 11)

2)myarray.length;

the string class has a length() method to return the number of characters. i have sometimes become confused between the two.

answer 12)

3) a frame with one large button marked four in the centre

the default layout manager for a frame is the borderlayout manager. this layout manager defaults to placing components in the centre if no constraint is passed with the call to the add method.

answer 13)

4) do nothing, the flowlayout will position the component

answer 14)

1) use the setlayout method