bt0074 smu bsc it winter 2015 (april/may 2016 exam) IIIrd sem assignment

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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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