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The first lines of a method are usually devoted to checking the validity of method arguments.
The idea is to fail as quickly as possible in the event of an error. It's a reasonable policy for a class to skip validating arguments of clause of the method's javadoc, since they clearly state the method's requirements to the caller (the pre-conditions).
An email address must contain at least a ‘@’ sign and a dot (.).If the parser is not 1.2 compliant, and therefore does not support XML Schema, it could throw a The first attribute defines the XML Name Space (xmlns) prefix, "xsi", where "xsi" stands for "XML Schema Instance".The second line specifies the schema to use for elements in the document that do not have a namespace prefix -- that is, for the elements you typically define in any simple, uncomplicated XML document.Java Script provides a way to validate form's data on the client's computer before sending it to the web server. First let us see how to do a basic form validation.In the above form, we are calling validate() to validate data when onsubmit event is occurring.