Java Como Programar Deitel 11 Pdf

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    In Chapter 8 (Classes and Objects) and Chapter 9 (Object-Oriented Programming) , Deitel emphasizes cohesion – each class should represent a single, well-defined entity.

    class Bird 
    public void fly()  /* fly logic */

    class Penguin extends Bird 
@Override
public void fly() 
throw new UnsupportedOperationException("Penguins can't fly!");
// This breaks LSP – you can't safely substitute Penguin for Bird

    Chapter 10 introduces interfaces. Deitel’s examples (like Payable) are naturally narrow. ISP says: split large interfaces into smaller, role-specific ones.

    // Violation: One class handles both employee data AND payroll calculation
class Employee 
    private String name;
    private double salary;

    public void saveToDatabase()  /* ... */ 
public double calculateBonus()  /* ... */ 

    

    

    // Compliance: Separate responsibilities
class Employee 
private String name;
private double salary;
// getters/setters only

    

    class PayrollCalculator 
public double calculateBonus(Employee emp)  /* ... */ 

    

    class EmployeeRepository 
public void save(Employee emp)  /* ... */