OOP Part 1: Java Classes, Objects, Constructors & Inheritance
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1) O documento apresenta os conceitos fundamentais da programação orientada a objetos (OOP), incluindo objetos, classes, construtores, encapsulamento, herança e overriding de métodos. 2) As classes definem o estado e comportamento de objetos através de atributos (variáveis) e métodos. Construtores inicializam objetos quando são criados. 3) A herança permite que subclasses herdem e estendam o estado e comportamento de superclasses. O overriding de métodos permite subclasses substituírem implementações de métodos herdados.
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OOP Part 1: Java Classes, Objects, Constructors & Inheritance
- 1. Programação Orientada a Objectos (OOP) - Part 1: Java Jorge C. S. Cardoso, Luís Gustavo Martins jorgecardoso@ieee.org, lmartins@porto.ucp.pt Cursos de Verão na Católica 2010
- 9. OOP Concepts Encapsulation keep implementation private and separate from interface • Polymorphism different objects, same interface • Inheritance hierarchical organization, share code, customize or extend behaviors
- 29. Exercício public class Fraction { int numerator; int denominator; public void setTo(int n, int d) { this.numerator = n; this.denominator = d; } public Fraction add(Fraction f) { Fraction result = new Fraction(); int resultNum, resultDenom; resultNum = this.numerator*f.denominator + this.denominator*f.numerator; resultDenom = this.denominator * f.denominator; result.setTo(resultNum, resultDenom); result.reduce(); return result; }
- 30. Exercício public class Calculator { Fraction operand1, operand2; public Calculator(Fraction frac1, Fraction frac2) { operand1 = frac1; operand2 = frac2; } public Fraction performOperation(char op) { Fraction result = new Fraction(); switch(op) { case '+': result = operand1.add(operand2); break; case '-': result = operand1.subtract(operand2); break; case '*': result = operand1.multiply(operand2); break; case '/': result = operand1.divide(operand2); break; } return result; } }
- 31. Exercício Fraction f1 = new Fraction(); Fraction f2 = new Fraction(); Fraction result; f1.setTo(1, 4); f2.setTo(1, 4); Calculator calc = new Calculator(f1, f2); result = calc.performOperation('+'); result.print();