JAVA题库:格林模拟试题二（下）3

　　Question 36)
　　Which of the following are Java key words
　　1)double
　　2)Switch
　　3)then
　　4)instanceof
　　Question 37)
　　What will be output by the following line?
　　System.out.println(Math.floor(-2.1));
　　1) -2
　　2) 2.0
　　3) -3
　　4) -3.0
　　Question 38)
　　Given the following main method in a class called Cycle and a command line of
　　java Cycle one two
　　what will be output?
　　public static void main(String bicycle[]){        System.out.println(bicycle[0]);}
　　1) None of these options
　　2) cycle
　　3) one
　　4) two
　　Question 39)
　　Which of the following statements are true?
　　1) At the root of the collection hierarchy is a class called Collection
　　2) The collection interface contains a method called enumerator
　　3) The interator method returns an instance of the Vector class
　　4) The Set interface is designed for unique elements