What is throw keyword in java?

Answer 1

The throw keyword is used from within a method to "throw" an exception to the calling method. In order to throw an exception, the method signature must indicate that it will throw an exception. For example: public void foo() throws Exception { } When you want to actually throw the exception, you can do it a few different ways: throw new Exception("Exception message"); or from within a catch block ( catch(Exception ex) ): throw ex;

Answer 2

public class Example1 {

public static void main(String[] args) {

int i=1,j =0,k;

try

{

k=i/j;

}catch(ArithmeticException ae)

{

System.out.println("Division by zero,illegal operation");

}

System.out.println("Hello World");

}

}

Answer 3

The throw keyword is part of Java's exception handling. An exception is when normal processing fails for some reason (e.g., an IOException would occur because a data file could not be read or written). The Java method that encounters this condition would throw an Exception object. There are many exception classes build into Java (subclasses to the Exception class), and you can create your own exceptions classes by extending one of the existing exception classes.

When the exception us thrown (using the throw keyword), the execution of the method terminates without completing, and the exception object is delivered to the calling method. If that method has exception handling (using try, catch, and finally keywords), the program can perform some actions in response to the exception, and processing can continue. If exceptions are not handled, execution will terminate.

Answer 4

The throw keyword is used to throw User Defined Exceptions explicitly.