Contact Class Requirements The contact object shall have a required unique contact ID string that cannot be longer than 10 characters. The contact ID shall not be null and shall not be updatable. The contact object shall have a required firstName String field that cannot be longer than 10 characters. The firstName field shall not be null. The contact object shall have a required lastName String field that cannot be longer than 10 characters. The lastName field shall not be null. The contact object shall have a required phone String field that must be exactly 10 digits. The phone field shall not be null. The contact object shall have a required address field that must be no longer than 30 characters. The address field shall not be null.

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OOPs

In today's technology-driven world, computer programming skills are in high demand. The object-oriented programming (OOP) approach is very much useful while designing and maintaining software programs. Object-oriented programming (OOP) is a basic programming paradigm that almost every developer has used at some stage in their career. 

Constructor

The easiest way to think of a constructor in object-oriented programming (OOP) languages is: