The Exception Handling in Java is one amongst the powerful mechanism to handle the runtime errors so traditional flow of the program will be maintained.
Applet is a special type of program that is embedded in the webpage to generate the dynamic content.
in this tutorial we will discuss about
exception handling in C#
Exception class
creating user-defined exception
throw keyword
finally keyword
with examples'
what is exception?
what is exception handling?
When occur Exception in a program?
Why we use exception handling macanisum?
explain try, catch, finally keywords.
try,catch and finally-Rules.
Types of Exception.
example of Some java Pre-defined /Built-in exception class.
User-defined Eceptions
Exception in java?
in this tutorial we will discuss about
exception handling in C#
Exception class
creating user-defined exception
throw keyword
finally keyword
with examples'
what is exception?
what is exception handling?
When occur Exception in a program?
Why we use exception handling macanisum?
explain try, catch, finally keywords.
try,catch and finally-Rules.
Types of Exception.
example of Some java Pre-defined /Built-in exception class.
User-defined Eceptions
Exception in java?
Exception is an error event that can happen during the execution of a program and disrupts its normal flow. Java provides a robust and object oriented way to handle exception scenarios, known as Java Exception Handling.
Developing Applets in Java. Its syntax, advantages and example games that can be developed using Applets. Definition of applets. The use of applets in developing lightweight applications like calculator and Snake game.
An exception is a problem that arises during the time of execution of program. An exception can occur for many different reasons, including the following.
A user has enter invalid data.
A file that needs to be opened cannot be found.
A network connection has been lost in the middle of communicatons,or the JVM has run out of memory.
Some of these exception are caused by user error, others by programmer error, and others by physical resources, that have failed in some manner.
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2. Content
Introduction
Exception Handling
Exceptions in Java
Hierarchy of Java Exception classes
Types of Exceptions
Exception Handling Java
Java Applet
What is Applet?
Advantage & Drawback of Applet
Some Important Points on Java Applet
Lifecycle of Java Applet
2
3. Some Interesting Facts about Java
The initial name of java was “Oak”. it had been modified to Java by Sun’s
marketing department once they found that name was already registered for a
computer company.
Java is the second preferred language and is incredibly popular among the
developers.
Java does not support the concept of pointer.
Java is used by 95% of the companies as their primary language. Which is much
more than C and other languages.
3
4. Introduction
The Exception Handling in Java is one amongst the powerful mechanism to
handle the runtime errors so traditional flow of the program will be maintained.
Applet is a special type of program that is embedded in the webpage to generate
the dynamic content.
4
6. Exceptions in Java
An exception is an unwanted or unexpected event, which occurs during the
execution of a program i.e. at run time, that disrupts the normal flow of the
program’s instructions.
6
public class A{
public static void main(String args[])
{
int a=2, b=0, c;
c=a/b; //Exception
System.out.println(c);
}
}
8. Types of Exceptions
8
The classes which directly inherit Throwable class
except RuntimeException and Error are known as
checked exceptions
The classes which inherit RuntimeException are
known as unchecked exceptions
These are not exceptions at all, but problems that
arise beyond the control of the user or the
programmer.
10. Exception Handling Java
10
Exception Handling mechanism follows a flow which is depicted in the below figure. But if an
exception is not handled, it may lead to a system failure. That is why handling an exception is
very important.
11. Exception Handling Java
Keyword Description
try The "try" keyword is used to specify a block where we
should place exception code. The try block must be
followed by either catch or finally.
catch The "catch" block is used to handle the exception. It
must be preceded by try block
finally The "finally" block is used to execute the important code
of the program. It is executed whether an exception is
handled or not.
throw The "throw" keyword is used to throw an exception.
throws The "throws" keyword is used to declare exceptions. It
doesn't throw an exception.
11
12. Exception Handling Java(Example)
package ExceptionHandling;
public class Exception {
public static void main(String args[]) {
try {
int c=100/0;
}catch(ArithmeticException e) {
System.out.println("Exception caught");
}
}
}
12
14. What is Applet?
An applet is a Java program that runs in a Web browser.
An applet can be a fully functional Java application because it has the entire Java
API at its disposal.
14
15. Advantage & Drawback of Applet
Advantage of Applet
It works at client side so less response time.
Secured
It can be executed by browsers running under many platforms, including Linux,
Windows, Mac OS etc.
Drawback of Applet
Plugin is required at client browser to execute applet.
15
16. Some Important Points on Java Applet
All applets are sub-classes (either directly or indirectly) of java.applet.Applet
class.
Applets are not stand-alone programs. Instead, they run within either a web
browser or an applet viewer. JDK provides a standard applet viewer tool called
applet viewer.
In general, execution of an applet does not begin at main() method.
Output of an applet window is not performed by System.out.println(). Rather it is
handled with various AWT methods, such as drawString().
16
19. Lifecycle methods for Applet(Cont.)
19
init( )
destroy( )
start( )
paint( )
stop( )
is used to initialized the Applet. It is invoked only once.
is used to destroy the Applet. It is invoked only once.
is invoked after the init() method or browser is maximized. It is used to start the Applet
is used to paint the Applet. It provides Graphics class object.
is used to stop the Applet. It is invoked when Applet is stop or browser is minimized.
20. A "Hello, World" Applet
import java.applet.*;
import java.awt.*;
public class HelloWorldApplet extends Applet {
public void paint (Graphics g) {
g.drawString ("Hello World", 25, 50);
}
}
20
<html>
<title>The Hello, World Applet</title>
<hr>
<applet code = "HelloWorldApplet.class"
width = "320" height = "120">
</applet>
<hr>
</html>
HelloWorldApplet.java HelloWorldApplet.html
21. Conclusion
Exceptions are used to improve error efficiency.
The Exception Handling in Java is one of the powerful mechanism to handle
the runtime errors.
Applet is a Java program that can be embedded into a web page. It runs inside
the web browser and works at client side.
21
22. References
Head First Java, 2nd Edition [Book] - O'Reilly Media
http://javatpoint.com/java-tutorial
https://www.geeksforgeeks.org/java/
http://www.programmingtutorials.com/java.aspx
22