Mock java Questions set - 5

Sun Certified Java Programmer(SCJP 1.4)

Mock Exam - 5
Q1 Which of the following are the correct form of documentation comments?
A1 //some text here
A2 /*some text here*/
A3 /**some text here*/
A4 all the above
Q2
State the correct formula for minimum/maximum values for integer primitives
where no_of_bits is the size of the type in bits.
A1 2^(no_of_bits-1) / 2^(no_of_bits-1)+1
A2 2^(no_of_bits+1) / 2^(no_of_bits+1)+1
A3 2^(no_of_bits-1) / 2^(no_of_bits-1)-1
A4 all the above
Q3 Which of the following initializes boolean primitive?
A1 Boolean flag=true;
A2 boolean flag=true;
A3 boolean flag=TRUE;
A4 Boolean flag=TRUE;
Q4
which of the following is the correct way to define a class that will be in the
default package
A1
package default;
import java.util.*;
A2
import java.util.*;
package default;
A3 import java.util.*;
A4 all the above
Q5 Which of the following main method in a java application is correct?
A1 public static void main(String[] args)
A2 public void main(String args[])
A3 public static void main (string[] args)
A4 final public static void main (String[] args)
A5 static public void main(String x[])
A6 static void main (string[] args)
A7 a and e only.
A8 g and d
Q6 Which of the following is default integer primitive
A1 short
A2 int
A3 byte
A4 char
A5 long
Q7 Which of the following is not a reserved word in java
A1 import
A2 finally
A3 friend
A4 goto
Q8
When writing a utility class, someclass, which extends mainclass class and will
be used by several other classes in a large project. These other classes will be in
different packages.Pick the correct class declaration
A1 class someclass extends mainclass
A2 protected class someclass extends mainclass
A3 public class someclass extends mainclass
A4 none
Q9 Which of the following variable names are invalid?
A1 example
A2 2sumup
A3 its4u
A4 $money
Q10
Take a look at the following code:
public static void main (String[] args){
System.out.println(args[1]);
}
The above is compiled and then executed by the following command line.
java test one two three four
choose the correct output
A1 one
A2 two
A3 three
A4 four
A5 none.
Answers
1 c
2
c Substitute no_of_bits = ( 8 for byte , 16 for short, 16 for char, 32 for int, 64 for long,
32 for float, 64 for double).We get (2^7) / (2^7) -1 for int and so on for other types
3
b primitive boolean keyword is 'boolean' and boolean can be only 'true' or 'false'
4
c. there is nothing like explicit declaration for default package. The class is added to
default package if there is no package statement.
5
h Valid declaration for the main() method must be public and static, have void as return
type and take a single array of String objects as arguments. The order of public and
static keywords is irrelevant. Also declaring the method final does not effect the method's
potential to be used as a main() method.
6 b
7 c . There are no friend functions as in C++.
8 c
9 b
10 b Array index start from 0. So somearray[0] points to the first element in the array.
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