BT0074, OOPS with JAVA

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Assignment

PROGRAM	BSc IT
SEMESTER	THIRD
SUBJECT CODE & NAME	BT0074, OOPS with JAVA
BK ID	B1002
CREDIT	4 CREDITS
MAX. MARKS	60

1 Describe the syntax and working of if-else with an example. Also write a program in java that assigns a grade based on the value of a test score: an A for a score of 90% or above, a B for a score of 80% or above, and so on.

Answer: General if..else syntax is as follows:

If given condition is TRUE, expr_set1 will get executed.

If given condition is FALSE (not TRUE),

2 List and explain all the string comparison functions. Write a program in java to reverse a string.

Answer:String Comparison Functions are :

Comparison	Primitives	Objects
a == b, a != b	Equal values	Compares references, not values. The use of == with object references is generally limited to the following: ·         Comparing to see if a reference is null. ·         Comparing two enum values. This works because there is only one object for each enum constant.

3 Describe with the help of an example the implementation of inheritance in java.

Answer: The most fundamental element of Java is the class. A class represents an entity and also, defines and implements its functionality. In Java, classes can be derived from other classes, in order to create more complex relationships. A class that is derived from another class is called subclass and inherits all fields and methods of its superclass. In Java, only

5 Draw and Explain the Life cycle of a java applet with an example.

Answer: Java applet inherits features from the class Applet. Thus, whenever an applet is created, it undergoes a series of changes from initialization to destruction. Various stages of an applet life cycle are depicted in the figure below:

Initial State

When a new applet is born or created, it is

6 Define java beans and beanbox. Describe the advantages of java beanbox.

Answer: In computing based on the Java Platform, JavaBeans are classes that encapsulate many objects into a single object (the bean). They are serializable, have a zero-argument constructor, and allow access to properties using getter and setter methods. The name "Bean" was given to encompass this standard, which aims to create reusable software components for Java.

Advantages:

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