answer 55)

1) yield()
2) sleep
4) stop()

note, the methods stop and suspend have been deprecated with the java2 release, and you may get questions on the exam that expect you to know this. check out the java2 docs for an explanation

answer 56)

1) addelement

answer 57)

the import statement allows you to use a class directly instead of fully qualifying it with the full package name, adding more classess with the import statement does not cause a runtime performance overhad. i assure you this is true. an inner class can be defined with the protected modifier, though i am not certain why you would want to do it. an inner class can be defined with the private modifier, try compiling some sample code before emailing me to ask about this.

3)a inner class may under some circumstances be defined with the protected modifier
4) an interface cannot be instantiated

answer 58)

1) mousepressed(mouseevent e){}
4) componentadded(containerevent e){}

answer 59)

1) iterator
2) isempty
3) toarray

answer 60)

2) ensures only one thread at a time may access a method or object

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