JAVA题库:格林模拟试题三（下）(6)

文章作者 100test 发表时间 2007:03:14 17:37:38
来源 100Test.Com百考试题网

question 48)

which of the following statements are true?

1) static methods cannot be overriden to be non static
2) static methods cannot be declared as private
3) private methods cannot be overloaded
4) an overloaded method cannot throw exceptions not checked in the base class

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question 49)

which of the following statements are true?

1) the automatic garbage collection of the jvm prevents programs from ever running out of memory
2) a program can suggest that garbage collection be performed but not force it
3) garbage collection is platform independent
4) an object becomes eligible for garbage collection when all references denoting it are set to null.

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question 50)

given the following code

public class sytch{

int x=2000.

public static void main(string argv[]){

        system.out.println("ms " argv[1] "please pay $" x).

        }



}

what will happen if you attempt to compile and run this code with the command line

java sytch jones diggle

1) compilation and output of ms diggle please pay $2000
2) compile time error
3) compilation and output of ms jones please pay $2000
4) compilation but runtime error

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question 51)

what will happen when you attempt to compile and run the following code

class base{

protected int i = 99.

}

public class ab{

private int i=1.

public static void main(string argv[]){

ab a = new ab().

a.hallow().

}



       abstract void hallow(){

        system.out.println("claines " i).

        }



}

1) compile time error
2) compilation and output of claines 99
3) compilation and output of claines 1
4) compilation and not output at runtime