difference between exceptions thrown by us and thrown by the jvm

[Ankur kothari]

there is a question in masterlabs that which one of these are thrown by us and not by jvm?

1.classcastexception
2.numberformatexception
3.illegalstateexception
4.illegalargumentexception
5.exceptionininitializer

why is the answer only b,c,d not nothing else...? and when is the 5th exception thrown?

thank you

[Abhay Agarwal]

Below mentioned is the code which generates ExceptionInInitializer at runtime

public class TestException {
		static int [] x = new int[4];
		static { x[4] = 5; } //Here we are trying to access array at index which exceeds it size
	public static void main(String a[]) {
	}
}

[Ankur kothari]

but isnt this arrayindexoutofboundsexception?

[Allan Cheong]

You won't throw ClassCastException and ExceptionInInitializer when writing codes. Those are thrown by the JVM when such exceptional condition occurs. The other three are thrown by the developers that developed the Java API. So I think it is considered to be thrown by "us".

ExceptionInInitializer could be thrown when there's something wrong in a static block. E.g.

	static {
		Integer i = null;
		int i2 = i;
	}

[rohan yadav]

hi Ankur i think you will find suitable explanation in k&b book in exception handling chapter.
And for your question answer are follows:

1. ClassCastException Thrown when attempting to cast a reference By the JVM
variable to a type that fails the IS-A test.

2.NumberFormatException Thrown when a method that converts a
String to a number receives a String that it Programmatically
cannot convert

3.IllegalStateException Thrown when the state of the environment Programmatically
doesn’t match the operation being attempted,
e.g., using a Scanner that’s been closed.

4.IllegalArgumentException Thrown when a method receives an argument Programmatically
formatted differently than the method
expects.

5.ExceptionInInitializerError Thrown when attempting to initialize a static By the JVM
variable or an initialization block.

Hope you understand

[Ankit Garg]

Ankur kothari wrote:there is a question in masterlabs

What is masterlabs??

[Ankur kothari]

masterexams

[Ankur kothari]

oh right rohan...i need to understand that table in the book....thanks everyone

[Punit Singh]

Sorry, I did not understand the question at first time.