JAVA认证

which of the following statements are true?

1) methods cannot be overriden to be more private

2) static methods cannot be overloaded

3) private methods cannot be overloaded

4) an overloaded method cannot throw exceptions not checked in the base class

answer to question 16

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question 17)

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

class base {}

class sub extends base {}

class sub2 extends base {}

public class cex{

public static void main(string argv[]){

base b=new base();

sub s=(sub) b;

}

}

1) compile and run without error

2) compile time exception

3) runtime exception

answer to question 17

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question 18)

which of the following statements are true?

1) system.out.println( -1 >>> 2);will output a result larger than 10

2) system.out.println( -1 >>> 2); will output a positive number

3) system.out.println( 2 >> 1); will output the number 1

4) system.out.println( 1 <<< 2); will output the number 4

answer to question 18

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question 19)

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

public class tux extends thread{

static string sname = 'vandeleur';

public static void main(string argv[]){

tux t = new tux();

t.piggy(sname);

system.out.println(sname);

}

public void piggy(string sname){

sname = sname + ' wiggy';

start();

}

public void run(){

for(int i=0;i < 4; i++){

sname = sname + ' ' + i;

}

}

}

1) compile time error

2) compilation and output of 'vandeleur wiggy'

3) compilation and output of 'vandeleur wiggy 0 1 2 3'

4) compilation and probably output of 'vandeleur' but possible output of 'vandeleur 0 1 2 3'

answer to question 19

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question 20)

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

//code start

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