Basics features of java

# Java is simple
# Java is secure
# Java is portable
# Java is object-oriented
# Java is robust
# Java is multithreaded
# Java is architecture-neutral
# Java is interpreted
# Java’s performance
# Java is distributed
# Java is dynamic

Java is simple

Java is Easy to write and more readable and eye catching.
Java has a concise, cohesive set of features that makes it easy to learn and use.
Most of the concepts are drew from C++ thus making Java learning simpler.

Java is secure

Java program cannot harm other system thus making it secure.
Java provides a secure means of creating Internet applications.
Java provides secure way to access web applications.

Java is portable

Java programs can execute in any environment for which there is a Java run-time system.
(JVM) Java programs can be run on any platform (Linux,Window,Mac) Java programs can be transferred over world wide web (e.g applets)

Java is object-oriented

Java programming is object-oriented programming language.
Like C++ java provides most of the object oriented features.
Java is pure OOP. Language. (while C++ is semi object oriented)

Java is robust

Java encourages error-free programming by being strictly typed and performing run-time checks.

Java is multithreaded

Java provides integrated support for multithreaded programming.

Java is architecture-neutral

Java is not tied to a specific machine or operating system architecture.
Machine Independent i.e Java is independent of hardware .

Java is interpreted

Java supports cross-platform code through the use of Java bytecode.
Bytecode can be interpreted on any platform by JVM.

Java’s performance

Bytecodes are highly optimized.
JVM can executed them much faster

Java is distributed

Java was designed with the distributed environment.
Java can be transmit,run over internet.

Java is dynamic

Java programs carry with them substantial amounts of run-time type information that is used to verify and resolve accesses
to objects at run time.

Disclaimer

All tutorials are for informational and educational purposes only and have been made using our own routers, servers, websites and other vulnerable free resources. we do not contain any illegal activity. We believe that ethical hacking, information security and cyber security should be familiar subjects to anyone using digital information and computers. Hacking Truth is against misuse of the information and we strongly suggest against it. Please regard the word hacking as ethical hacking or penetration testing every time this word is used. We do not promote, encourage, support or excite any illegal activity or hacking.

Introduction

Customers have high expectations for the code we produce.

Users will use our programs in unexpected ways.

Due to design errors or coding errors, our programs may fail in unexpected ways during execution.

It is our responsibility to produce quality code that does not fail unexpectedly.

Consequently, we must design error handling into our programs. 

Errors and Error handling

An Error is any unexpected result obtained from a program during execution.

Unhandled errors may manifest themselves as incorrect results or behavior, or as abnormal program termination.

Errors should be handled by the programmer, to prevent them from reaching the user.


Memory errors (i.e memory incorrectly allocated, memory leaks…)

File system errors (i.e. disk is full…)

Network errors (i.e. network is down…)

Calculation errors (i.e. divide by 0)

Array errors (i.e. accessing element –1)

Types of Exceptions

Unchecked Exceptions

Checked Exceptions It is not required that these types Must either be caught by a of exceptions be caught or method or declared in
its declared on a method. signature.


Runtime exceptions can be

Placing exceptions in the generated by methods or by method signature harkens the JVM itself.

Errors are generated from deep within the JVM.

Keywords

• throws Describes the exceptions which can be raised by a method.
  

• throw Raises an exception to the first available handler in the call stack, unwinding the stack along the way.
  

• try Marks the start of a block associated with a set of exception handlers.
  

• catch If the block enclosed by the try generates an exception of this type, control moves here; watch out for implicit subsumption.
  

• finally Always called when the try block concludes, and after any necessary catch handler is complete.

There are two types of errors:

Compile time errors
Runtime error



Compile time errors

Instead of declaring int a; you mistakenly declared it as in a; for which compiler will throw an error.



Runtime Errors Example

A Runtime error is called an Exceptions error. It is any event that interrupts the normal flow of program execution.

Example for exceptions are, arithmetic exception, Nullpointer exception, Divide by zero exception, etc.

class JavaException {
   public static void main(String args[]){
      int d = 0;
      int n = 20;
      int fraction = n/d;
     System.out.println("End Of Main");
   }

Disclaimer

All tutorials are for informational and educational purposes only and have been made using our own routers, servers, websites and other vulnerable free resources. we do not contain any illegal activity. We believe that ethical hacking, information security and cyber security should be familiar subjects to anyone using digital information and computers. Hacking Truth is against misuse of the information and we strongly suggest against it. Please regard the word hacking as ethical hacking or penetration testing every time this word is used. We do not promote, encourage, support or excite any illegal activity or hacking.

MCA Previous Year question paper of Data Structure

Our website provide solved previous year question paper for Data Structure from 2016-2017. Doing preparation from the previous year question paper helps you to get good marks in exams.  

Disclaimer

This is the assignment of CORE & ADVANCE JAVA Programming of MCA course in which we have to explain about object oriented technology and to do java programming etc.

M.C.A CORE & ADVANCE JAVA ASSIGNMENT SEM-I

1) What is Object Oriented Programming? Explain features of Object Oriented Programming.

2.) Write a java program to demonstrate the use of different data types available in java.

3. What is static variable and static method? Explain why main method in java is always static.

4) What is inheritance? Explain the advantage of inheritance with an example. What are different types of inheritance supported by java?

5) Explain the need of package in Java. Write a java program to show how package is created.

6) What is abstract class? Explain need of abstract class with the help of an example.

7) What is an exception? Explain how an exception is handled in Java. Create a user defined Exception class in java.

 

 

8) Write a java program to create Thread and use it to give animation effect to a Lable control.

 

 

 

 

 

 

 

 

 

 

 

9) WAP to insert new records in BookDetails Table using java and mysql.

 

 

 

 

 

 

11). WAP in servlet to Authenticate a user based on Userid and password.

12) WAP in servlet to insert new records in Product Table.

 

 

 

 

 

 

 

 

 

 

13) What are the different Scripting elements in JSP explain with example.

14) What are the different standard tags used to set and get the values of JavaBean.

15) What is expression language? How to retrieve the value of input field using expression language.

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