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Bt0074
Winter
2015
1 What are the tools available
in JDK? Briefly explain.
Answer: Three tools are included in
the JDK (Java Development Kit): Keytool, Jar and Jarsigner.
Keytool
Keytool,
the Java security key tool, is used to create and manage public keys, private
keys and security certificates. It can be used to do the following:
Ø Manages the own public key /
private key pairs.
Ø Stores the public keys
2 Write a note on:
1. String Handling
2. String Literals
3. Character Extraction.
Answer: String Handling
An
array represents a number of variables which occupy contiguous spaces in the
memory. Each element in the array is distinguished by its index. All elements
in an array must be of the same data type.
3 Describe with the help of an
example the implementation of inheritance in java.
Answer: Implementing Inheritance in Java
The
extends keyword is used to derive a class from a superclass, or in other words,
extend the functionality of a superclass.
Syntax
4 Describe the catch and
finally block statement in java with examples.
Answer: The catch Block
You
associate an exception-handler with the try block by providing one or more
catch handlers
5 Draw and Explain the Life
cycle of a java applet with an example.
Answer: Life Cycle of an Applet
You
can describe the life cycle of an applet through four methods. These methods
are:
Ø The init() method.
Ø The
6 What are the information
required while creating a new key pair using key tool? Explain self-signed
certificates?
Answer: The –genkey option of
keytool is used to create a new public / private key pair. There are many
configuration options that can be used to retrieve, replace or delete the pair.
Key store aliases are not case sensitive. If the –keystore option is not used,
the key pair will be stored in the default
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