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CUSTOMER_CODE
SMUDE
DIVISION_CODE
SMUDE
EVENT_CODE
Oct2016
ASSESSMENT_CODE MIT103_Oct2016
QUESTION_TYPE
DESCRIPTIVE_QUESTION
QUESTION_ID
12944
QUESTION_TEXT
List and explain the various features of Java.
The various features of Java are:
•Simple
•Secure
•Portable
•Object-oriented
•Robust
SCHEME OF EVALUATION •Multithreaded
•Architecture – neutral
•Interpreted
•High performance
•Distributed
•Dynamic
Brief explanation of each feature (any 10) Marks: 1x10=10
QUESTION_TYPE
DESCRIPTIVE_QUESTION
QUESTION_ID
12945
QUESTION_TEXT
Explain the following methods associated with the String object in
Java. Give the syntax.
i.toCharArray
ii.regionMatches
iii.compareTo
iv.lastIndexOf
v.trim
SCHEME OF
EVALUATION
i.toCharArray
Syntax:
char [ ] toCharArray( ) – returns the String object into array of
characters.
ii.regionMatches
Syntax:
boolean regionMatches(int startIndex, String str2, int str2StartIndex,
int numChars);
or
boolean regionMatches(boolean ignoreCase, int startIndex, String str2,
int
str2StartIndex, int numChars);
Compares a specific region inside a string with another specific region
in another string. There is an overloaded form that allows you to ignore
case in such comparisons.
iii.compareTo
Syntax:
int compareTo(String str);
Here, str is the String being compared with the invoking String. The
result of the comparison is returned and is interpreted as shown:
Value
1.Less than zero
2.Greater than zero
3.Zero
Meaning
1.Invoking string is less than str
2.Invoking string is greater than str
3.Two strings are equal
iv.lastIndexOf()
Syntax:
int lastIndexOf(char ch);
or
int lastIndexOf(String str);
Searches for the last occurrence of a character or substring.
v.Trim
Syntax:
String trim();
Returns a copy of the invoking string from which any leading and
trailing whitespace has been removed.
(Marks: 2 x 5 =10)
QUESTION_TYPE
DESCRIPTIVE_QUESTION
QUESTION_ID
72588
QUESTION_TEXT
Write a Short note on following SWING components
a. JRadioButton
b. JOptionPane
c. JComboBox
d. JDialog
e. JFrame
SCHEME OF
EVALUATION
a. JRadioButton this class represents Swing radio buttons, By using
radio buttons, you can select an option from a given list of mutually
exclusive options.
b. JOptionPane this class represents the option panes in Swing.
Option panes are dialog boxes that displays some information to the
user or get confirmation from the user so that the program can be
executed further based on the choice the user makes.
c. A Swing combo box is an enhancement over the AWT component
called Choice. The Combo box is a pull down list with a capability to
display the selected item in a display area. You can also enter an item in
the display area to edit it into the list.
d. This class represents the layered panes in Swing. Layered panes
create the dimension along the depth of a component. You can position
components on each layer of the layered pane. Swing applets and frame
contain layered panes by default.
e. This Class represents the Swing frame that is more sophisticated
than the AWT frame; You can add components in layers, add a menu
bar or paint over the component.
(2 marks each)
QUESTION_TYPE DESCRIPTIVE_QUESTION
QUESTION_ID
120578
QUESTION_TEXT
What is a package in Java? How do you define a package in Java?
Explain the class member access permissions in Java.
Java provides a mechanism for partitioning the class name space into
more manageable chunks. This mechanism is the package. The package is
both a naming and a visibility control mechanism. (1 Mark)
Defining a Package:
SCHEME OF
EVALUATION
Include a package command as the first statement in a Java source file.
Any classes declared within that file will belong to the specified package.
The package statement defines a name space in which classes are stored.
If you omit the package statement, the class names are put into the default
package, which has no name. The general form of the package statement:
package pkg;
Here, pkg is the name of the package
For example, the following statement creates a package called
MyPackage.
package MyPackage;
We can create a hierarchy of packages. To do so, simply separate each
package name from the one above it by use of a period
The general form of a multileveled package statement is :
package pkg1[.pkg2[.pkg3]];
For example, a package declared as package java.awt.image; needs to be
stored in java/awt/image, java\\awt\\image, or java:awt:image on your
UNIX, Windows, or Macintosh file system, respectively. (4 Marks)
Access Protection:
(5 marks)
QUESTION_TYPE DESCRIPTIVE_QUESTION
QUESTION_ID
120579
Briefly explain the various constants and methods used in
QUESTION_TEXT i.
ii.
i.
SCHEME OF
EVALUATION
ActionEvent class
AdjustmentEvent class
ActionEvent Class:
An ActionEvent is generated when a button is pressed, a list item is
double-clicked, or a menu item is selected. The ActionEvent class defines
four integer constants that can be used to identify any modifiers
associated with an action event: ALT_MASK, CTRL_MASK,
META_MASK, and SHIFT_MASK. In addition, there is an integer
constant, ACTION_PERFORMED, which can be used to identify action
events. (2 Marks
)
ActionEvent has these three constructors:
ActionEvent(Object src, int type, String cmd)
ActionEvent(Object src, int type, String cmd, int modifiers)
ActionEvent(Object src, int type, String cmd, long when, int modifiers)
Here, src is a reference to the object that generated this event. The type of
the event is specified by type, and its command string is cmd. The
argument modifiers indicates which modifier keys (ALT, CTRL, META,
and/or SHIFT) were pressed when the event was generated. The when
parameter specifies when the event occurred. You can obtain the
command name for the invoking ActionEvent object by using the
getActionCommand( ) method, shown here:
String getActionCommand( )
For example, when a button is pressed, an action event is generated that
has a command name equal to the label on that button. (3 marks)
ii.
AdjustmentEvent class
An AdjustmentEvent is generated by a scroll bar. The AdjustmentEvent
class defines integer constants that can be used to identify them.
(2 Marks)
In addition, there is an integer constant,
ADJUSTMENT_VALUE_CHANGED that indicates that a change has
occurred.
The constructor:
AdjustmentEvent(Adjustable src, int id, int type, int data)
src is a reference to the object that generated this event. The id equals
ADJUSTMENT_VALUE_CHANGED
The type of the event is specified by type, and its associated data is data.
The getAdjustable( ) method returns the object that generated the event.
The type of the adjustment event may be obtained by the
getAdjustmentType( ) method. (3 Marks)
QUESTION_TYPE
DESCRIPTIVE_QUESTION
QUESTION_ID
120581
a.
What are the rules for overriding a method in Java?
b.
Write any three uses of Inheritance.
QUESTION_TEXT
a.
1.
The method name and the order of arguments should be identical
to that of the superclass method.
2.
SCHEME OF
EVALUATION
The return type of both the methods must be the same.
3.
The overriding method cannot be less accessible than the method
it overrides.
4.
An overriding method cannot raise more exceptions that those
raised by the superclass.
b.
1.
Inheritance reduces redundancy in code. Code redundancy means
writing the same code in different places, leading to unnecessary
replication of code. Inheritance helps you to reuse the code.
2.
Maintain code easily, as the code resides at one place. Any
changes made to the superclass automatically change the behavior of
the subclass.
3.
Extend the functionality of an existing class by adding more
methods to the subclass.
(10 marks)