Why this method does not throw error?

[arun mahajan]

Hi,

I was trying to go through with exception handling and found that any exception thrown by a method should be catch. but when I tried following code it works and have not shown any error while compiling while the method as per javadoc throws IndexOutOfBoundsException.

class DemoSubString {
	public static void main(String[] args) {
		String sub = "";
		int index = Integer.parseInt(args[1]);

		sub = args[0].substring(index);
		System.out.println("Sub string value:: "+sub);
	}
}

Could you help me to understand.

[Ulf Dittmer]

any exception thrown by a method should be catch

Not every exception, only so-called checked exceptions. Note that Integer.parseInt also throws an unchecked exception. Unchecked exceptions are those that extend java.lang.RuntimeException and java.lang.Error.

See http://docs.oracle.com/javase/tutorial/essential/exceptions/runtime.html for more details. (You may actually wish to work through the entire tutorial on exceptions: http://docs.oracle.com/javase/tutorial/essential/exceptions/index.html.)