JAVA认证

question 1)

which of the following lines will compile without warning or error.

1) float f=1.3;

2) char c='a';

3) byte b=257;

4) boolean b=null;

5) int i=10;

answer to question 1

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question 2)

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

public class myclass {

public static void main(string arguments[]) {

amethod(arguments);

}

public void amethod(string[] arguments) {

system.out.println(arguments);

system.out.println(arguments[1]);

}

}

1) error can′t make static reference to void amethod.

2) error method main not correct

3) error array must include parameter

4) amethod must be declared with string

answer to question 2

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question 3)

which of the following will compile without error

1)

import java.awt.*;

package mypackage;

class myclass {}

2)

package mypackage;

import java.awt.*;

class myclass{}

3)

/*this is a comment */

package mypackage;

import java.awt.*;

class myclass{}

answer to question 3

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question 4)

a byte can be of what size

1) -128 to 127

2) (-2 power 8 )-1 to 2 power 8

3) -255 to 256

4)depends on the particular implementation of the java virtual machine

answer to question 4

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question 5)

what will be printed out if this code is run with the following command line?

java myprog good morning

public class myprog{

public static void main(string argv[])

{

system.out.println(argv[2])

}

}

1) myprog

2) good

3) morning

4) exception raised: 'java.lang.arrayindexoutofboundsexception: 2'

answer to question 5

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question 6)

which of the following are keywords or reserved words in java?

1) if

2) then

3) goto

4) while

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