Question 1)

Which of the following are legal statements?

1) float f=1/3;
2) int i=1/3;
3) float f=1.01;
4) double d=999d;

Answer to
Question 1)

Question 2)

Which of the following are Java keywords?

1) NULL
2) new
3) instanceOf
4) wend

Answer to
Question 2)

Question 3)

Which of the following are valid statements?

1) System.out.println(1+1);
2) int i=2+'2';
3) String
s="on"+'one';
4) byte b=255;

Answer to
Question 3)

Question 4)

Which of the following statements are true?

1) The garbage collection algorithm in Java is vendor implemented
2) The
size of primitives is platform dependent
3) The default type for a numerical
literal with decimal component is a float.
4) You can modify the value in an
Instance of the Integer class with the setValue method

Answer to
Question 4)

Question 5

Which of the following are true statements?

1) I/O in Java can only be performed using the Listener classes
2) The
RandomAccessFile class allows you to move directly to any point a file.
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.
4) The
characteristics of an instance of the File class such as the directory
separator, depend on the current underlying operating system

Answer to
Question 5)

Question 6

Which of the following statements are true?

1) The instanceof operator can be used to determine if a reference is an
instance of a class, but not an interface.
2) The instanceof operator can be
used to determine if a reference is an instance of a particular primitive
wrapper class
3) The instanceof operator will only determine if a reference
is an instance of a class immediately above in the hierarchy but no further up
the inheritance chain
4) The instanceof operator can be used to determine if
one reference is of the same class as another reference thus

Answer to
Question 6)

Question 7

Which of the following statements are true?

1) An interface can only contain method and not variables
2) Interfaces
cannot have constructors
3) A class may extend only one other class and
implement only one interface
4) Interfaces are the Java approach to
addressing its lack of multiple inheritance, but require implementing classes to
create the functionality of the Interfaces.

Answer to
Question 7)

Question 8

Which of the following are valid statements

1) public class MyCalc extends Math
2) Math.max(s);
3)
Math.round(9.99,1);
4)Math.mod(4,10);

Answer to
Question 8)

Question 9

Which of the following are methods of the Runnable interface

1) run
2) start
3) yield
4) stop

Answer to
Question 9)

Question 10

Which of the following statements are true?

1) A byte can represent between -128 to 127
2) A byte can represent
between -127 to 128
3) A byte can represent between -256 to 256
4) A char
can represent between -2x2 pow 16 2 x2 pow 16 - 1

Answer to
Question 10)

Question 11

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

class Base{
    public void Base(){
	System.out.println("Base");
    }
}
public class In extends Base{
    public static void main(String argv[]){
	In i=new In();
    }
}

1) Compile time error Base is a keyword
2) Compilation and no output at
runtime
3) Output of Base
4) Runtime error Base has no valid
constructor

Answer to
Question 11)

Question 12

You have a public class called myclass with the main method defined as
follows

public static void main(String parm[]){
    System.out.println(parm[0]);
}

If you attempt to compile the class and run the program as follows

java myclass hello

What will happen?

1) Compile time error, main is not correctly defined
2) Run time error,
main is not correctly defined
3) Compilation and output of java
4)
Compilation and output of hello

Answer to
Question 12)

Question 13

Which of the following statements are true?

1) If a class has any abstract methods it must be declared abstract
itself.
2) All methods in an abstract class must be declared as
abstract
3) When applied to a class, the final modifier means it
cannot be sub-classed
4) transient and volatile are Java modifiers

Answer to
Question 13)

Question 14

Which of the following are valid methods?

1) public static native void amethod(){}
2) public static void
amethod(){}
3) private protected void amethod(){}
4) static native void
amethod();

Answer to
Question 14)

Question 15

Which of the following statements are true?

1) Constructors cannot have a visibility modifier
2) Constructors can be
marked public and protected, but not private
3) Constructors can only have a
primitive return type
4) Constructors are not inherited

Answer to
Question 15)

Question 16

What will happen when you attempt to compile and run the following class?

class Base{
Base(int i){
    System.out.println("Base");
    }
}

class Severn extends Base{
public static void main(String argv[]){
        Severn s = new Severn();
    }
void Severn(){
         System.out.println("Severn");
    }
}

1) Compilation and output of the string "Severn" at runtime
2) Compile
time error
3) Compilation and no output at runtime
4) Compilation and
output of the string "Base"

Answer to
Question 16)

Question 17

Which of the following statements are true?

1) static methods do not have access to the implicit variable called
this
2) A static method may be called without creating an instance of
its class
3) A static method may not be overriden to be non-static
4) A
static method may not be overloaded

Answer to
question 17)

Question 18

Which of the following will compile without error?

char c='1';
System.out.println(c>>1);

Integer i=Integer("1");
System.out.println(i>>1);

int i=1;
System.out.println(i<<<1);

int i=1;
System.out.println(i<<1);

Answer to
Question 18)

Question 19

Which of the following are true?

1) A component may have only one event listener attached at a time
2) An
event listener may be removed from a component
3) The ActionListener
interface has no corresponding Adapter class
4) The processing of an event
listener requires a try/catch block

Answer to
Question 19)

Question 20

Which of the following are Java keywords?

1) sizeof
2) main
3) transient
4) volatile

Answer to
Question 20)

Question 21

Which of the following statements are true?

1) The default constructor has a return type of void
2) The default
constructor takes a parameter of void
3) The default constructor takes no
parameters
4) The default constructor is not created if the class has any
constructors of its own.

Answer to
Question 21)

Question 22

Which of the following statements are true?

1) All of the variables in an interface are implicitly static
2) All of
the variables in an interface are implicitly final
3) All of the methods in
an interface are implicitly abstract
4) A method in an interface can access
class level variables

Answer to
Question 22)

Question 23

Which of the following statements are true?

1) The String class is
implemented as a char array, elements are addressed using the stringname[]
convention
2) The + operator is overloaded for concatenation for the String
class
3) Strings are a primitive type in Java and the StringBuffer is used as
the matching wrapper type
4) The size of a string can be retrieved using the
length property

Answer to
Question 23)

Question 24

Which of the following statements are true?

1) A method in an interface must not have a body
2) A class may extend one
other class plus at most one interface
3) A class may extends at most one
other class plus implement many interfaces
4) An class accesses an interface
via the keyword uses

Answer
to Question 24)

Question 25

Which of the following statements are true?

1) The following statement will produce a result of 1. System.out.println( -1
>>>2);
2) Performing an unsigned left shift (<<<) on a
negative number will always produce a negative number result
3) The following
statement will produce a result of zero, System.out.println(1 >>1);
4)
All the Java integral types are signed numbers

Answer to
Question 25)

Question 26

Which of the following statements are true?

1) The elements in a Java array can only be of primitive types, not
objects
2) Arrays elements are initialized to default values wherever they
are created using the keword new
3) An array may be dynamically
resized using the setSize method
4) You can find out the size of an array
using the size method

Answer to
Question 26)

Question 27

Given the following class

public class Ombersley{
public static void main(String argv[]){
        boolean b1 = true;
        if((b1 ==true) || place(true)){
                System.out.println("Hello Crowle");
                }
        }

        public static boolean place(boolean location){
        if(location==true){
                System.out.println("Borcetshire");
                }
        System.out.println("Powick");
        return true;
        }
}

What will happen when you attempt to compile and run it?

1) Compile time error
2) Output of "Hello Crowle"
3) Output of
Borcetshire and Powick followed by "Hello Crowle"
4) No output

Answer to
Question 27)

Question 28

You are given a class hierarchy with an instance of the class Dog. The class
Dog is a child of mammal and the class Mammal is a child of the class
Vertebrate. The class Vertebrate has a method called move which prints
out the string "move". The class mammal overrides this method and prints out the
string "walks". The class Dog overrides this method and prints out the string
"walks on paws". Given an instance of the class Dog,. how can you access the
ancestor method move in Vertebrate so it prints out the string
"move";

1) d.super().super().move();
2) d.parent().parent().move();
3)
d.move();
4) none of the above;

Answer to
Question 28)

Question 29

Which of the following most closely describes the process of overriding?

1) A class with the same name replaces the functionality of a class defined
earlier in the hierarchy
2) A method with the same name completely replaces
the functionality of a method earlier in the hierarchy
3) A method with the
same name but different parameters gives multiple uses for the same method
name
4) A class is prevented from accessing methods in its immediate
ancestor

Answer to
Question 29)

Question 30

Which of the following statements are true?

1) The % is used to calculate a percentage thus: 10 % 20=50
2) The /
operator is used to divide one value by another
3) The # symbol may not be
used as the first character of a variable
4) The $ symbol may not be used as
the first character of a variable

Answer to
Question 30)

Question 31

Which of the following statements are true?

1) The default layout manager for an Applet is FlowLayout
2) The default
layout manager for a Frame is FlowLayout
3) A layout manager must be assigned
to an Applet before the setSize method is called
4) The FlowLayout manager
attempts to honor the preferred size of any components

Answer to
Question 31)

Question 32

Which of the following statements are true about a variable created with the
static modifier?

1) Once assigned the value of a static variable may not
be altered
2) A static variable created in a method will keep the same value
between calls
3) Only one instance of a static variable will exist for any
amount of class instances
4) The static modifier can only be applied to a
primitive value

Answer to
Question 32)

Question 33

Which of the following statements are true?

1) Java uses a system called UTF for I/O to support international character
sets
2) The RandomAccessFile is the most suitable class for supporting
international character sets
3) An instance of FileInputStream may not be
chained to an instance of FileOutputStream
4) File I/O activities requires
use of Exception handling

Answer to
Question 33)

Question 34

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

import java.io.*;
class ExBase{
    abstract public void martley(){       
    }

}

public class MyEx extends ExBase{
    public static void main(String argv[]){
        DataInputStream fi = new DataInputStream(System.in);
        try{
	    fi.readChar();
        }catch(IOException e){
	    System.exit(0);
        }
        finally {System.out.println("Doing finally");}
    }
}

1) Compile time error
2) It will run, wait for a key press and then
exit
3) It will run, wait for a keypress, print "Doing finally" then
exit
4) At run and immediately exit

Answer to
Question 34)

Question 35

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

public class Borley extends Thread{
    public static void main(String argv[]){
        Borley b = new Borley();
        b.start();
    }
    public void run(){      
        System.out.println("Running");
    }
}

1) Compilation and run but no output
2) Compilation and run with the
output "Running"
3) Compile time error with complaint of no Thread
target
4) Compile time error with complaint of no access to Thread
package

Answer to
Question 35)

Question 36

Assuming any exception handling has been set up, which of the following will
create an instance of the RandomAccessFile class

1) RandomAccessFile raf=new RandomAccessFile("myfile.txt","rw");
2)
RandomAccessFile raf=new RandomAccessFile( new DataInputStream());
3)
RandomAccessFile raf=new RandomAccessFile("myfile.txt");
4) RandomAccessFile
raf=new RandomAccessFile( new File("myfile.txt"));

Answer to
Question 36)

Question 37

Given the following class definition

public class Upton{
public static void main(String argv[]){     
        }
        public void amethod(int i){}
        //Here
}

Which of the following would be legal to place after the comment //Here
?
1) public int amethod(int z){}
2) public int amethod(int i,int j){return
99;}
3) protected void amethod(long l){ }
4) private void
anothermethod(){}

Answer to
Question 37)

Question 38

Which of the following statements are true?

1) Code must be written if the programmer wants a frame to close on selecting
the system close menu
2) The default layout for a Frame is the BorderLayout
Manager
3) The layout manager for a Frame cannot be changed once it has been
assigned
4) The GridBagLayout manager makes extensive use of the the
GridBagConstraints class.

Answer to
Question 38)

Question 39

Given the following class definition

public class Droitwich{
        class one{
                private class two{
                        public void main(){
                        System.out.println("two");
                        }
                }
        }
}

Which of the following statements are true

1) The code will not compile because the classes are nested to more than
one level
2) The code will not compile because class two is marked as
private
3) The code will compile and output the string two at runtime
4)
The code will compile without error

Answer to
Question 39)

Question 40

Given the following code

class Base{
static int oak=99;
}

public class Doverdale extends Base{
public static void main(String argv[]){
        Doverdale d = new Doverdale();
        d.amethod();
        }
        public void amethod(){
        //Here
        }       
}

Which of the following if placed after the comment //Here, will compile and
modify the value of the variable oak?

1) super.oak=1;
2) oak=33;
3) Base.oak=22;
4) oak=50.1;

Answer to
Question 40)

Question 41

You are creating an application that has a form with a text entry field used
to enter a persons age. Which of the following is appropriate for capturing this
information.

1) Use the Text field of a TextField and parse the result using
Integer
2) Use the getInteger method of the TextField
3) Use the getText
method of a TextBox and parse the result using the getInt method of Integer
class
4) Use the getText method of a TextField and use the parseInt method of
the Integer class

Answer to
Question 41)

Question 42

Given the following declaration

Integer i=new Integer(99);

How can you now set the value of i to 10?

1) i=10;
2) i.setValue(10);
3) i.parseInt(10);
4) none of the
above

Answer to
Question 42)

Question 43

Which of the following statements are true

1) constructors cannot be overloaded
2) constructors cannot be
overridden
3) a constructor can return a primitive or an object
reference
4) constructor code executes from the current class up the
hierarchy to the ancestor class

Answer to
Question 43)

Question 44

Given a reference called

to a class which extends Thread, which of the following will cause it to give
up cycles to allow another thread to execute.

1) t.yield();
2) Thread.yield();
3) yield(100); //Or some other
suitable amount in milliseconds
4) yield(t);

Answer to
Question 44)

Question 45

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

public class Sandys{
private int court;
public static void main(String argv[]){
        Sandys s = new Sandys(99);
        System.out.println(s.court);
        }
Sandys(int ballcount){
        court=ballcount;
        }
}

1) Compile time error, the variable court is defined as private
2)
Compile time error, s is not initialized when the System.out method is
called
3) Compilation and execution with no output
4) Compilation and run
with an output of 99

Answer to
Question 45)

Question 46)

Which of the following statements are true?

1) A method cannot be overloaded to be less public in a child class
2) To
be overridden a method only needs the same name and parameter types
3) To be
overridden a method must have the same name, parameter and return types
4) An
overridden method must have the same name, parameter names and parameter
types

Answer to
Question 46)

Question 47

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

class Base{
Base(){
        System.out.println("Base");
        }
}

public class Checket extends Base{
public static void main(String argv[]){
        Checket c = new Checket();
        super();
        }

Checket(){
        System.out.println("Checket");  
        }       
}

1) Compile time error
2) Checket followed by Base
3) Base followed by
Checket
4) runtime error

Answer to
Question 47)

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

Answer to
Question 48)

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.

Answer to
Question 49)

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

Answer to
Question 50)

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

Answer to
Question 51)

Question 52

You have been asked to create a scheduling system for a hotel and catering
organsiation.

You have been given the following information and asked to create a set of
classes to represent it.

On the catering side of the organsiation they have

Head Chefs
Chefs
Apprentice Chefs

The system needs to store an employeeid, salary and the holiday
entitlement

How would you best represent this information in Javae been given the
following information and asked to create a set of classes to represent it.

How would you best represent this information in Java

1) Create classes for Head Chef, Chef, Apprentice Chef and store the other
values in fields
2) Create an employee class and derive sub classes for Head
Chef, Chef, Apprentice Chef and store the other values in fields.
3) Create
and employee class with fields for Job title and fields for the other
values.
4) Create classes for all of the items mentioned and create a
container class to represent employees

Answer to
Question 52)

Question 53

You need to read in the lines of a large text file containing tens of
megabytes of data. Which of the following would be most suitable for reading in
such a file

1) new FileInputStream("file.name")
2) new InputStreamReader(new
FileInputStream("file.name"))
3) new BufferedReader(new InputStreamReader(new
FileInputStream("file.name")));
4) new RandomAccessFile raf=new
RandomAccessFile("myfile.txt","+rw");

Answer to
Question 53)

Question 54

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

public class Inc{
public static void main(String argv[]){
                Inc inc = new Inc();
                int i =0; 
                inc.fermin(i);
                i = i++;
                System.out.println(i);
        }
        void fermin(int i){
                i++;
        }
}

1) Compile time error
2) Output of 2
3) Output of 1
4) Output of
0

Answer to
Question 54)

Question 55

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

public class Agg{
static public long i=10;
public static void main(String argv[]){
        switch(i){
                default:
                System.out.println("no value given");
                case 1: 
                System.out.println("one");
                case 10:
                System.out.println("ten");
                case 5:
                System.out.println("five");
        }
    }
}

1) Compile time error
2) Output of "ten" followed by "five"
3) Output
of "ten"
4) Compilation and run time error because of location of default

Answer to
Question 55)

Question 56

Given the following class

public class ZeroPrint{
public static void main(String argv[]){
        int i =0;
        //Here  
        }
}

Which of the following lines if placed after the comment //Here will print
out 0.

1) System.out.println(i++);
2) System.out.println(i+'0');
3)
System.out.println(i);
4) System.out.println(i--);

Answer to
Question 56)

Question 57

Given the following code

class Base {}

class Agg extends Base{
        public String getFields(){
         String name =  "Agg";
        return name;
        }
}


public class Avf{
public static void main(String argv[]){
        Base a = new Agg();
        //Here
        }
}

What code placed after the comment //Here will result in calling the
getFields method resulting in the output of the string "Agg"?

1) System.out.println(a.getFields());
2) System.out.println(a.name);
3)
System.out.println((Base) a.getFields());
4) System.out.println( ((Agg)
a).getFields());

Answer to
Question 57)

Question 58

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

public class Pvf{

static boolean Paddy;
public static void main(String argv[]){
        System.out.println(Paddy);
        }

}

1) Compile time error
2) compilation and output of false
3) compilation
and output of true
4) compilation and output of null

Answer to
Question 58)

Question 59

Which of the following statements are true?

1) The x,y coordinates of an instance of MouseEvent can be obtained using the
getX() and getY() methods
2) The x,y coordinates of an instance of MouseEvent
can be obtained using the X and Y integer fields
3) The time of a MouseEvent
can be extracted using the getTime() method
4) The time of a MouseEvent can
be extracted using the getWhen method

Answer to
Question 59)

Question 60

Given the following code 

import java.io.*;

public class Ppvg{
public static void main(String argv[]){
        Ppvg p = new Ppvg();
        p.fliton();
        }
        public int fliton(){
        try{
                FileInputStream din = new FileInputStream("Ppvg.java");
                din.read();
        }catch(IOException ioe){
		System.out.println("flytwick");       
        	return 99;
        }finally{
        	System.out.println("fliton");
        	}
        return -1;
        }
        
}

Assuming the file Ppvg.java is available to be read which of the following
statements are true if you try to compile and run the program?

1) The program will run and output only "flytwick"
2) The program will run
and output only "fliton"
3) The program will run and output both "fliton" and
"flytwick"
4) An error will occur at compile time because the method fliton
attempts to return two values

Answer to
Question 60)

Answers

Answer to Question 1)

Objective 4.5)

1) float f=1/3;
2) int i=1/3;
4) double d=999d;

The fact that option 3 does not compile may be a surprise. The problem is
because the default type for a number with a decimal component is a double and
not a float. The additional trailing d in the option with 999 doesn't help, but
it doesn't harm.

Friday, July 2, 2010

Question 1)

Question 2)

Answers