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Hi, everyone, I am a new comer of Java, now I got a problem that i need to finish the following test as soon as possible, but I have no time to do it, so please help me to finish it if you can, ok? It is very very important to me, and I know it is quite a lot questions, so just do as much as you guys could, ok? I appreciate for that seriously!
Group A. Multiple Choice (1 Mark for each question):
     �� PLEASE CHOOSE ONLY ONE ANSWER FROM : a), b), c), d).
A.1. The CPU, RAM, and the soundcard communicate through the:
     a) CPU Heatsink.
     b) Bus.
     c) Magnetic coil.
     d) Thyristors.
A.2. In the early 1990, Byarne Stroustrup and James Gosling respectively introduced:
     a) Pascal and Java.
     b) Object Pascal and Java.
     c) C++ and Java.
     d) Java and C++.
A.3. Which of the following are illegal identifier in Java?
     a) 3Input
     b) _Currency
     c) $cents
     d) Second22
A.4. A function-type method will always:
     a) destroy an object.
     b) create a component.
     c) return a value.
     d) return itself back.
A.4. The keyword ��void�� is only legal in:
     a) Inner-Class declaration.
     b) Method declaration.
     c) Instance variable declaration.
     d) Interface declaration.
A.5. What is the size and range of the ��int�� primitive data type in Java?
     a) Size: 32-bit, Range: -128 to 127.
     b) Size: 32-bit, Range: 0 to 65,535.
     c) Size: 32-bit, Range: -2 Billion to +2 Billion.
     d) Size: 32-bit, Range: -1.7 Trillion to +1.7 Trillion.
A.6. What is the size and range of the ��char�� primitive data type in Java?
     a) Size: 8-bit, Range: -128 to +127.
     b) Size: 8-bit, Range: 0 to 65,535.
     c) Size: 8-bit, Range: -2 Billion to +2 Billion.
     d) Size: 8-bit, Range: -1.7 Trillion to 1.7 Trillion.
A.7. Which of the following is not Java keyword?
     a) abstract.
     b) for.
     c) switch.
     d) then.
A.8. Which of the following is an illegal array declaration?
     a) int [ ] [ ] myChairs [ ];
     b) char [ ] myChairs;
     c) int [6] myChairs;
     d) char myChairs [ ];
A.9. In Java, a ��constructor�� is used for?
     a) initializing instance variables of an object.
     b) creating a valid interface of an object.
     c) creating a duplicate class.
     d) repeating heap table.
A.10. In Java, each object belongs to:
     a) a class.
     b) a method.
     c) an abstract class.
     d) an applet.
A.11. Constructor name is always the same as:
     a) the first string variable name.
     b) the class name.
     c) the stack name.
     d) the statement name.
A.12. Which is false?
     a) if ( name = = harry )
     b) if ( name = = ��harry�� )
     c) if ( name.equals(��harry��) )
     d) if ( name.equalsIgnoreCase(��harry��) )
A.13. A Java ��interface�� is to provide a way to:
     a) approximate inheritance from 2 parents.
     b) approximate a class instance.
     c) create a new string.
     d) create random enumeration.
A.14. Which one of the following is false:
     a) for ( int i = 1 , j = 2 ; i < 5 ; i + +, j + + )
     b) for ( int i = 1 , i < 5 ; i + + )
     c) for ( int i = 1 ; i <= 5 ; i + + )
     d) for ( int i = 1 ; i <= 10 ; i +=2 )
A.15. To ��override�� a method is :
     a) to supply a different implement of a method that exists in the superclass.
     b) to simply change the name of a method.
     c) to supply a fresh new method that does not exists in the superclass.
     d) to supply a duplicate method.
A.16. After executing statements in a ��try�� block, if there was no exception occur, then:
     a) ��catch�� clauses are skipped.
     b) ��catch�� clauses are executed once.
     c) ��catch�� clauses are executed twice.
     d) ��try�� block is executed again.
A.17. Which is false in Java:
     a) arrays have fixed length.
     b) arrays have elements of a specific type.
     c) arrays use [ ] to access elements.
     d) arrays does not have a fixed length.
A.18. Testing a program without understanding its internal structure is called:
     a) white-box testing.
     b) black-box testing.
     c) blue-box testing.
     d) regression testing.
A.19. The default layout manager in Java is:
     a) Border layout.
     b) Flow layout.
     c) Grid layout.
     d) Card layout.
A.20. Which of the following is false:
     a) Applet runs inside a web-browser.
     b) Applet is platform neutral.
     c) Applet can be used to create animation.
     d) Applet has a ��main�� method.
A.21. To respond to user mouse click we need :
     a) a runnable interface.
     b) an event handler.
     c) a constructor.
     d) a string tokenizer.
A.22. The topmost super class in Java is:
     a) This class.
     b) Object class.
     c) Container class.
     d) Java class.
A.23. In 40 randomly-ordered items, Selection sort is much slower than:
     a) Bubble sort.
     b) Insertion sort.
     c) Quick sort.
     d) Bi-directional Bubble sort.
A.24. A sorting algorithm with a complexity of O( nlog(n) ) is:
     a) Insertion sort.
     b) Selection sort.
     c) Quick sort.
     d) Bubble sort.
A.25. In Java, the abstraction for enabling network communication is achieved by:
     a) Container.
     b) Socket.
     c) Frame.
     d) Template.
A.26. Which of the following is legal for using one line to declare, construct, and initialize an array?
     a) int [ ] myList = (5,8,9);
     b) int [ ] myList = {2,3,4};
     c) int myList [ ] = [3,4,5];
     d) int [ ] myList = {2;3;4};
A.27. Which of the following is a true statement?
     a) An abstract class is not allowed to have non-abstract methods.
     b) if a class has abstract methods, it must be declared abstract.
     c) A non-abstract class is allowed to have abstract methods.
     d) A non-abstract class is allowed to have abstract methods as long as they are also static. .
A.28. In Object Oriented terms, if you read ��A Hotdog is a Food��, which of the following is true:
     a) Class Food extends class Hotdog.
     b) Class Hotdog extends class Food.
     c) Class Food extends class Food.
     d) Class Hotdog is in the package Food.
A.29. Which of the following is a false statement about constructors?
     a) Constructors are not inherited.
     b) Constructors cannot be overloaded.
     c) The first statement of every constructor is a call to: super.
     d) The first statement of every constructor is a call to: this.
A.30. Given the statement String str = ��jawbreaker��; which of the followings will return the word
     the word ��break��
     a) str.substring(3,5)
     b) str.substring(4,6)
     c) str.substring(3,8)
     d) str.substring(4,8)
A.31. Which of the following is false statement about Java constructors?
     a) A constructor��s name must exactly match the name of the class.
     b) Constructors must not have a return type.
     c) Constructors may have a return type.
     d) If you don��t type a constructor, the Java compiler will insert a default constructor.
A.32. Which of the following is not a Java standard layout manager?
     a) GridBagLayout.
     b) FlowLayout.
     c) GridLayout.
     d) GridCardLayout.
A.33. In Java, multiple inheritance is implemented by:
     a) an interface.
     b) a call back function.
     c) an extension.
     d) a dummy method.
A.34. We can shorten the statement: String word2 = new String (��Charles��); with the following:
     a) String word2 = ��Charles��;
     b) String word2 = ��Charles��;
     c) String word2 = [Charles];
     d) String word2 = {Charles};
A.35. In Java, we can change the statement: sum = sum + 1; with the following :
     a) sum += 1; or by using: sum ++;
     b) sum =+1; or by using: sum+;
     c) sum ++ 1; or by using: sum +1;
     d) none of the above.
A.36. A ��main�� method is found in the following:
     a) Standalone Java program.
     b) A Java Applet program.
     c) A Java constructor.
     d) A Java interface.
A.37. In business world, large data usually stored in:
     a) Relational database system.
     b) Flat database system.
     c) Simple array database system.
     d) Single Link database system.
A.38. To access a large relational database, we usually use:
     a) MS Access Language.
     b) Structured Query Language.
     c) Structured Quantitative Language.
     d) Structured Recursive Language.
A.39. In method overloading we are usually:
     a) adding more arguments.
     b) adding more iterations.
     c) adding more recursions.
     d) adding more classes.
A.40. Which sorting algorithm uses a pivot-item:
     a) Merge sort.
     b) Quick sort.
     c) Bubble sort.
     d) Selection sort.
Group B. Find The Mistake (5 Marks for each question):
B.1. Please indicate where the mistake is, and suggest a correction:
     import java.awt.* ;
     import hsa.Console ;
     public class BlueRect
     {     static public void  main( String [ ] args )
          {      Console c;
               c.setColor( Color.blue ) ;
               c.fillRect( 0,0,50,100 ) ;
B.2. Please indicate where the mistake is, and suggest the correction:
     public class Test
          public static void main(String [ ] args)
          String [ ] names = new String();
          c.println( names [2] );     
B.3. Please correct the following Delphi code so that it does not generate compiler error:
     procedure Tform1.Button1Click(Sender: TObject);
     var
     MyArray : array[0..8] of Integer;
     X : Integer;
     begin
          X := MyArray[3] + MyArray[8] + MyArray[9];
     end;
B.4. Somewhere in your Java for-Loop code:
����.
     for (int square = 1, square <=36, square ++);
          for (int side =1, side <=4, side --)
          t.move(60);
�� ��
Group C. Short Questions (5 Marks for each question):
C.1. What is a Class in Object Oriented Programming? You may use an example if you wish.
C.2. What is the difference between = and = = in Java? You may use an example if you wish.
C.3. Why don��t we use double numbers all the time, everywhere? Why bother with Integers?
C.4 What are the three fundamental concepts in object-oriented programming which every Java user
needs to understand?
C.5 What is displayed when the following code is compiled and executed?
String s1 = new String(��Cambridge��);
String s2 = new String(��Cambridge��);
if ( s1 = = s2 )
     System.out.println(��Same��);
if ( s1.equals(s2) )
     System.out.println(��Equals��);
Circle one of the following answer:
a) Same
b) Equals
c) Same Equals
Group D. Complete The Codes (20 Marks):
D.1. In this program the computer user enters his/her 5 names and will get the 5 names printed on screen.
     import has.Console;
     public class MyList
     public static void main (String[ ] args)
          Console c ;
          ��������������������;
          int [ ] somelist = new int [5];
          c.println(��Enter your ������);
          for (����.. i=0; i<5; i��..) {
          somelist[i] = c.read����();
          c.println(�������������� );
     }/*end of main*/
     }/*end of MyList*/
Group E. Describe this Program (20 Marks for this question):
E.1. Given the following Java standalone program, please describe what will this program compute if
     you gave it the proper data. You can write your comments after each line of code. Try your best.
     Give an input and output examples.
     import has.Console;
     public class MyStuff
     public static void main (String[ ] args)
          Console c = new Console();
          int [ ] stuff = new int [5];
          c.println(��Enter your data��);
          for (int i=0; i<5; i++)
          stuff[i] = c.readInt();
          c.println(��The ����������. is �� + myFunction(stuff));
     }/*end of main*/
     public static int myFunction(int [ ] list)
          int top = list[0];
          for (int i=1; i<list.length; i++)
               if (list[i] > top)
               top = list;
          return top;
     }/*end of myFunction*/
     }/* end of MyStuff */

Answer 1

>
A.1. The CPU, RAM, and the soundcard communicate
through the:
     a) CPU Heatsink.
     b) Bus.
     c) Magnetic coil.
     d) Thyristors.c
A.2. In the early 1990, Byarne Stroustrup and James
Gosling respectively introduced:
     a) Pascal and Java.
     b) Object Pascal and Java.
     c) C++ and Java.
     d) Java and C++. a
A.3. Which of the following are illegal identifier in
Java?
     a) 3Input
     b) _Currency
     c) $cents
     d) Second22c
A.4. A function-type method will always:
     a) destroy an object.
     b) create a component.
     c) return a value.
     d) return itself back.d
A.4. The keyword ��void�� is only legal in:
     a) Inner-Class declaration.
     b) Method declaration.
     c) Instance variable declaration.
     d) Interface declaration.d
A.5. What is the size and range of the ��int��
primitive data type in Java?
     a) Size: 32-bit, Range: -128 to 127.
     b) Size: 32-bit, Range: 0 to 65,535.
     c) Size: 32-bit, Range: -2 Billion to +2 Billion.
d) Size: 32-bit, Range: -1.7 Trillion to +1.7
Trillion.d
A.6. What is the size and range of the ��char��
primitive data type in Java?
     a) Size: 8-bit, Range: -128 to +127.
     b) Size: 8-bit, Range: 0 to 65,535.
     c) Size: 8-bit, Range: -2 Billion to +2 Billion.
d) Size: 8-bit, Range: -1.7 Trillion to 1.7
Trillion.a
A.7. Which of the following is not Java keyword?
     a) abstract.
     b) for.
     c) switch.
     d) then.a
A.8. Which of the following is an illegal array
declaration?
     a) int [ ] [ ] myChairs [ ];
     b) char [ ] myChairs;
     c) int [6] myChairs;
     d) char myChairs [ ];a
A.9. In Java, a ��constructor�� is used for?
     a) initializing instance variables of an object.
     b) creating a valid interface of an object.
     c) creating a duplicate class.
     d) repeating heap table.b
A.10. In Java, each object belongs to:
     a) a class.
     b) a method.
     c) an abstract class.
     d) an applet.b
A.11. Constructor name is always the same as:
     a) the first string variable name.
     b) the class name.
     c) the stack name.
     d) the statement name.d
A.12. Which is false?
     a) if ( name = = harry )
     b) if ( name = = ��harry�� )
     c) if ( name.equals(��harry��) )
     d) if ( name.equalsIgnoreCase(��harry��) )b
A.13. A Java ��interface�� is to provide a way to:
     a) approximate inheritance from 2 parents.
     b) approximate a class instance.
     c) create a new string.
     d) create random enumeration.b
A.14. Which one of the following is false:
     a) for ( int i = 1 , j = 2 ; i < 5 ; i + +, j + + )
     b) for ( int i = 1 , i < 5 ; i + + )
     c) for ( int i = 1 ; i <= 5 ; i + + )
     d) for ( int i = 1 ; i <= 10 ; i +=2 )a
A.15. To ��override�� a method is :
a) to supply a different implement of a method that
exists in the superclass.
     b) to simply change the name of a method.
c) to supply a fresh new method that does not exists
in the superclass.
     d) to supply a duplicate method.d
A.16. After executing statements in a ��try�� block,
if there was no exception occur, then:
     a) ��catch�� clauses are skipped.
     b) ��catch�� clauses are executed once.
     c) ��catch�� clauses are executed twice.
     d) ��try�� block is executed again. b
A.17. Which is false in Java:
     a) arrays have fixed length.
     b) arrays have elements of a specific type.
     c) arrays use [ ] to access elements.
     d) arrays does not have a fixed length.a
A.18. Testing a program without understanding its
internal structure is called:
     a) white-box testing.
     b) black-box testing.
     c) blue-box testing.
     d) regression testing.d
A.19. The default layout manager in Java is:
     a) Border layout.
     b) Flow layout.
     c) Grid layout.
     d) Card layout.b
A.20. Which of the following is false:
     a) Applet runs inside a web-browser.
     b) Applet is platform neutral.
     c) Applet can be used to create animation.
     d) Applet has a ��main�� method.b
A.21. To respond to user mouse click we need :
     a) a runnable interface.
     b) an event handler.
     c) a constructor.
     d) a string tokenizer.c
A.22. The topmost super class in Java is:
     a) This class.
     b) Object class.
     c) Container class.
     d) Java class.a
A.23. In 40 randomly-ordered items, Selection sort is
much slower than:
     a) Bubble sort.
     b) Insertion sort.
     c) Quick sort.
     d) Bi-directional Bubble sort.b
A.24. A sorting algorithm with a complexity of O(
nlog(n) ) is:
     a) Insertion sort.
     b) Selection sort.
     c) Quick sort.
     d) Bubble sort.b
A.25. In Java, the abstraction for enabling network
communication is achieved by:
     a) Container.
     b) Socket.
     c) Frame.
     d) Template.d
A.26. Which of the following is legal for using one
line to declare, construct, and initialize an array?
     a) int [ ] myList = (5,8,9);
     b) int [ ] myList = {2,3,4};
     c) int myList [ ] = [3,4,5];
     d) int [ ] myList = {2;3;4};c
A.27. Which of the following is a true statement?
a) An abstract class is not allowed to have
non-abstract methods.
b) if a class has abstract methods, it must be
declared abstract.
c) A non-abstract class is allowed to have abstract
methods.
d) A non-abstract class is allowed to have abstract
methods as long as they are also static. . a
A.28. In Object Oriented terms, if you read ��A
Hotdog is a Food��, which of the following is true:
     a) Class Food extends class Hotdog.
     b) Class Hotdog extends class Food.
     c) Class Food extends class Food.
     d) Class Hotdog is in the package Food.d
A.29. Which of the following is a false statement
about constructors?
     a) Constructors are not inherited.
     b) Constructors cannot be overloaded.
c) The first statement of every constructor is a call
to: super.
d) The first statement of every constructor is a call
to: this.a
A.30. Given the statement String str =
��jawbreaker��; which of the followings will return
the word
     the word ��break��
     a) str.substring(3,5)
     b) str.substring(4,6)
     c) str.substring(3,8)
     d) str.substring(4,8)a
A.31. Which of the following is false statement about
Java constructors?
a) A constructor��s name must exactly match the name
of the class.
     b) Constructors must not have a return type.
     c) Constructors may have a return type.
d) If you don��t type a constructor, the Java
compiler will insert a default constructor.d
A.32. Which of the following is not a Java standard
layout manager?
     a) GridBagLayout.
     b) FlowLayout.
     c) GridLayout.
     d) GridCardLayout.a
A.33. In Java, multiple inheritance is implemented
by:
     a) an interface.
     b) a call back function.
     c) an extension.
     d) a dummy method.c
A.34. We can shorten the statement: String word2 =
new String (��Charles��); with the following:
     a) String word2 = ��Charles��;
     b) String word2 = ��Charles��;
     c) String word2 = [Charles];
     d) String word2 = {Charles};d
A.35. In Java, we can change the statement: sum =
sum + 1; with the following :
     a) sum += 1; or by using: sum ++;
     b) sum =+1; or by using: sum+;
     c) sum ++ 1; or by using: sum +1;
     d) none of the above.c
A.36. A ��main�� method is found in the following:
     a) Standalone Java program.
     b) A Java Applet program.
     c) A Java constructor.
     d) A Java interface.c
A.37. In business world, large data usually stored
in:
     a) Relational database system.
     b) Flat database system.
     c) Simple array database system.
     d) Single Link database system.d
A.38. To access a large relational database, we
usually use:
     a) MS Access Language.
     b) Structured Query Language.
     c) Structured Quantitative Language.
     d) Structured Recursive Language. a
A.39. In method overloading we are usually:
     a) adding more arguments.
     b) adding more iterations.
     c) adding more recursions.
     d) adding more classes.b
A.40. Which sorting algorithm uses a pivot-item:
     a) Merge sort.
     b) Quick sort.
     c) Bubble sort.
     d) Selection sort.b
Group B. Find The Mistake (5 Marks for each
question):
B.1. Please indicate where the mistake is, and suggest
a correction:
     import java.awt.* ;
     import hsa.Console ;
     public class BlueRect
     {     static public void  main( String [ ] args )
          {      Console c;
               c.setColor( Color.blue ) ;
               c.fillRect( 0,0,50,100 ) ;
     }"static public" should be "public static". it's reversed.
B.2. Please indicate where the mistake is, and suggest
the correction:
     public class Test
          public static void main(String [ ] args)
          String [ ] names = new String();
          c.println( names [2] );     
     } When declaring an array, do not put a space between the brackets. It should be "String[]".
B.3. Please correct the following Delphi code so that
it does not generate compiler error:
     procedure Tform1.Button1Click(Sender: TObject);
     var
     MyArray : array[0..8] of Integer;
     X : Integer;
     begin
          X := MyArray[3] + MyArray[8] + MyArray[9];
     end;
B.4. Somewhere in your Java for-Loop code:
����.
     for (int square = 1, square <=36, square ++);
          for (int side =1, side <=4, side --)
          t.move(60);
�� �� The object "t" was never declared or initialized. You probably need the following line:
Turtle t = new Turtle();
Group C. Short Questions (5 Marks for each question):
C.1. What is a Class in Object Oriented Programming?
You may use an example if you wish.A class describes what your program can do. For example:
class FileCopier {
// put code here
C.2. What is the difference between = and = =
in Java? You may use an example if you wish.= is for bitwise comparison, while == is for value comparison
C.3. Why don��t we use double numbers all the time,
everywhere? Why bother with Integers?An Integer is an object. Sometimes you need to store a number in a Vector; in this case, having an object is ideal.
C.4 What are the three fundamental concepts in
object-oriented programming which every Java user
needs to understand?Hiding information, hierarchy, member variables.
C.5 What is displayed when the following code is
compiled and executed?
String s1 = new String(��Cambridge��);
String s2 = new String(��Cambridge��);
if ( s1 = = s2 )
     System.out.println(��Same��);
if ( s1.equals(s2) )
     System.out.println(��Equals��);
Circle one of the following answer:
a) Same
b) Equals
c) Same Equals b
Group D. Complete The Codes (20 Marks):
D.1. In this program the computer user enters
his/her 5 names and will get the 5 names printed on
screen.
     import has.Console;
     public class MyList
     public static void main (String[ ] args)
          Console c ;
          ��������������������;
          int [ ] somelist = new int [5];
          c.println(��Enter your ������);
          for (����.. i=0; i<5; i��..) {
          somelist[i] = c.read����();
          c.println(�������������� );
     }/*end of main*/
     }/*end of MyList*/
Group E. Describe this Program (20 Marks for this
question):
E.1. Given the following Java standalone program,
please describe what will this program compute if
you gave it the proper data. You can write your
comments after each line of code. Try your best.
     Give an input and output examples.
     import has.Console;
     public class MyStuff
     public static void main (String[ ] args)
          Console c = new Console();
          int [ ] stuff = new int [5];
          c.println(��Enter your data��);
          for (int i=0; i<5; i++)
          stuff[i] = c.readInt();
c.println(��The ����������. is �� +
+ myFunction(stuff));
     }/*end of main*/
     public static int myFunction(int [ ] list)
          int top = list[0];
          for (int i=1; i<list.length; i++)
               if (list[i] > top)
               top = list;
          return top;
     }/*end of myFunction*/
     }/* end of MyStuff */
The program asks the user to enter 5 numbers. Then, it checks which number is greater than 0, and prints that number.