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Ocp2.java
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85 lines (72 loc) · 1.9 KB
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package principle.ocp;
/**
* @author ： CodeWater
* @create ：2022-05-03-16:37
* @Function Description ：修改:
* 把创建 Shape 类做成抽象类，并提供一个抽象的 draw 方法，让子类去实现即可，这样我们有新的图形
* 种类时，只需要让新的图形类继承 Shape，并实现 draw 方法即可，使用方的代码就不需要修 ->
*/
public class Ocp2 {
public static void main(String[] args) {
//使用看看存在的问题
GraphicEditor2 graphicEditor = new GraphicEditor2();
graphicEditor.drawShape(new Rectangle2());
graphicEditor.drawShape(new Circle2());
graphicEditor.drawShape(new Triangle2());
graphicEditor.drawShape(new OtherGraphic2());
}
}
//这是一个用于绘图的类 [使用方]
class GraphicEditor2 {
//接收 Shape 对象，调用 draw 方法
public void drawShape(Shape2 s) {
s.draw();
}
}
//Shape 类，基类
abstract class Shape2 {
int m_type;
abstract void draw();//抽象方法
}
class Rectangle2 extends Shape2 {
Rectangle2() {
super.m_type = 1;
}
@Override
public void draw() {
// TODO Auto-generated method stub
System.out.println(" 绘制矩形 ");
}
}
class Circle2 extends Shape2 {
Circle2() {
super.m_type = 2;
}
@Override
public void draw() {
// TODO Auto-generated method stub
System.out.println(" 绘制圆形 ");
}
}
//新增画三角形
class Triangle2 extends Shape2 {
Triangle2() {
super.m_type = 3;
}
@Override
public void draw() {
// TODO Auto-generated method stub
System.out.println(" 绘制三角形 ");
}
}
//新增一个图形
class OtherGraphic2 extends Shape2 {
OtherGraphic2() {
super.m_type = 4;
}
@Override
public void draw() {
// TODO Auto-generated method stub
System.out.println(" 绘制其它图形 ");
}
}