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In this tutorial We will be discussing following concepts in ER modeling. 

Employee.java //Employee Class (Base class) public class Employee { int Empno; String name; String telephone; double basicsalar; double othrs; double otrate; double netSal; public double calcNetSalary(){ return basicsalar + othrs * otrate; } public void displayNetSalary() { netSal = basicsalar + othrs * otrate; System.out.println("Net Salary: "+netSal); } //Set name public void setName(String name) { this.name = name; } //Set telephone public void setTelephone(String telephone) { this.telephone = telephone; } //Set Empno public void setEmpno(int Empno) { this.Empno = Empno; } //Set OT hours public void setOthrs(double othrs) { this.othrs = othrs; } //Set OT Rate public void setOtrate(double otrate) { this.otrate = otrate; } //Set OT Rate public void setBasicsalar(double basicsalar) { this.basicsalar = basicsalar; } } Manager.java //Manager Class public class Manager extends Employee { ...

Access control, sometimes called authorization, is how a web application grants access to content and functions to some users and not others. These checks are performed after authentication, and govern what ‘authorized’ users are allowed to do. Access control sounds like a simple problem but is insidiously difficult to implement correctly. A web application’s access control model is closely tied to the content and functions that the site provides. In addition, the users may fall into a number of groups or roles with different abilities or privileges. Developers frequently underestimate the difficulty of implementing a reliable access control mechanism. Many of these schemes were not deliberately designed, but have simply evolved along with the web site. In these cases, access control rules are inserted in various locations all over the code. As the site nears deployment, the ad hoc collection of rules becomes so unwieldy that it is almost impossible to understand. Many of these...

Java • 1991 - James Gosling, Sun Microsystems, Inc. • Originally a platform independent language for programming home appliances and was called “Oak” later renamed “Java” in 1995. • Later (1994) used for World Wide Web applications (since byte code can be downloaded and run without compiling it) • Eventually used as a general-purpose programming language (for the same reason as above plus it is object-oriented) • Why the name “Java”? Java was then named “Java”, paying homage to the large amounts of coffee consumed by the team. • Now owns by Oracle • Full-fledged application programming language • Additional capability as a Web programming language (currently the strength of its application base) • A pure OO programming language • NOT radical or especially new • Adopts its looks from C++, and its behavior from Smalltalk • Compiled to processor-neutral instruction set then interpreted on each supporting platform • Extremely fast adoption rate! (d...