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Exercicio-3-em-Java

Exercicio do livro Tutorial de Programação em Java e Orientação a Objetos

O programa a seguir exemplifica chamadas de métodos, para tal define um objeto que serve

como contador, a implementação representa a contagem no atributo num que é um número inteiro.

Os métodos são simples: incrementa adiciona um ao contador em qualquer estado e comeca

inicializa a contagem em zero. Decrementa faz o oposto de incrementa.

//Classe Contador, arquivo Contador.Java public class Contador { public int num; //este é o atributo //numero do contador public void incrementa() { num = num + 1; //acesso ao atributo } public void decrementa() { num = num - 1; } public void comeca(int n) //comeca a contar { num = n; } }

//Classe principal, Arquivo Princ.Java

public class Principal { public static void main(String args[]) {

Contador umcont; //declaracao de atributo contador umcont = new Contador(); //alocacao umcont.comeca(0); System.out.println(umcont.num); umcont.incrementa(); System.out.println(umcont.num); } }

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