格林模拟试题三（上）(1)

 questions

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question 1)

which of the following are legal statements?

1) float f=1/3;
3) float f=1.01;
question 2)

which of the following are java keywords?

1) null
3) instanceof
question 3)

which of the following are valid statements?

1) system.out.println(1+1);
3) string s="on"+'one';
question 4)

which of the following statements are true?

1) the garbage collection algorithm in java is vendor implemented
3) the default type for a numerical literal with decimal component is a float.
question 5)

which of the following are true statements?

1) i/o in java can only be performed using the listener classes
3) the creation of a named instance of the file class creates a matching file in the underlying operating system only when the close method is called.