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Exercicio-4-em-Java

Exercicio replicado do Livro Tutorial de Programação em Java e Orientação a Objetos

Método move:

O método move altera as coordenadas do objeto. O objeto tem suas coordenadas x e y somadas

com os argumentos dessa função. Note que este método representa uma maneira mais segura, clara,

elegante de alterar as coordenadas do objeto do que acessá-las diretamente da seguinte forma: ac.x

+= dx;. ac.y += dy;. Lembre-se que ac.x += dx é uma abreviação para ac.x = ac.x+dx;.

Método mostra:

O método mostra imprime na tela, de forma compacta, os atributos do objeto.

//Classe circulo public class Circulo { public float raio; public float x; //posicoes em coordenadas cartesianas public float y; public void move(float dx,float dy) { //move o circulo de lugar this.x += dx; y += dy; } public void mostra() //imprime na tela estado do objeto { System.out.println("(" + x + "," + y + "," + raio + ")"); } } //fim da declaracao da classe

//Classe principal, Arquivo Principal.Java class Principal { public static void main(String args[]) { Circulo umcirc; //declaracao de atributo circulo umcirc = new Circulo(); umcirc.x = 0; umcirc.y = 0; umcirc.raio = 12; umcirc.mostra(); umcirc.move(10,10); umcirc.mostra(); umcirc.x = 100; umcirc.mostra(); } }

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