pls send any five RUN TIME exceptions in java with definition and for what purpose they are used?  

Java provides various built in classes to the programmer which facilitates coding in Java. The most common exceptions are subclasses of the standard type RuntimeException. They are not requirewd to be manually included in any method’s throws list.

They are basically defined as unchecked exceptions because they are not checked by the complier to see if a method handles or throws these exceptions.


A small list of these Unchecked Run Time Built in exceptions is mentioned below for your reference:

Exceptions Meaning

ArithmeticException Arithmeti c error, such as divide-by-zero.

ArrayIndexOutOfB oundsException Array index is out-of-bounds.

ArrayStoreExcepti on Assignment to an array element of an incompatible type.

ClassCastException Inval id cast.

IllegalArgumentException Illegal argument used to invoke a method.

IllegalMonitorStateExcep tion Illegal monitor operation, such as waiting on an unlocked thread.

IllegalStateException Environment or application is in incorrect state.

IllegalThreadStateExcepti on Requested operation not compatible with current thread state.

IndexOutOfBoundsException Some type of index is out-of-bounds.

NegativeArraySize Exception Array created with a negative size.

NullPointerException Invalid use of a null reference.

NumberFormatException Invalid conversion of a string to a numeric Format

SecurityException Attempt to violate security.

StringIndexOutOfBounds Attempt to index outside the bounds of a string

UnsupportedOperationExcep tion An unsupported operation was encountered

Answered by Hem@nt .... , an ibibo Master, at 12:24 PM on September 25, 2008

1: NullPointerException :
Thrown when an application attempts to use null in a case where an object is required. These include:

* Calling the instance method of a null object.
* Accessing or modifying the field of a null object.
* Taking the length of null as if it were an array.
* Accessing or modifying the slots of null as if it were an array.
* Throwing null as if it were a Throwable value.

2: IllegalStateException :
Signals that a method has been invoked at an illegal or inappropriate time. In other words, the Java environment or Java application is not in an appropriate state for the requested operation.

3: NoSuchElementException :
Thrown by the nextElement method of an Enumeration to indicate that there are no more elements in the enumeration.

4:SystemException:
The root class for all CORBA standard exceptions. These exceptions may be thrown as a result of any CORBA operation invocation and may also be returned by many standard CORBA API methods. The standard exceptions contain a minor code, allowing more detailed specification, and a completion status. This class is subclassed to generate each one of the set of standard ORB exceptions. SystemException extends java.lang.RuntimeException; thus none of the SystemException exceptions need to be declared in signatures of the Java methods mapped from operations in IDL interfaces.

5:NegativeArraySizeException :
Thrown if an application tries to create an array with negative size.

Answered by Ashish Yadav , an ibibo Wizard, at 5:43 PM on September 25, 2008