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装饰器.cpp
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装饰器.cpp
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// 顶层接口
public interface Shape {
void draw();
void f1();
void f2();
}
// 抽象装饰器类
public abstract class ShapeDecorator implements Shape {
protected Shape decoratedShape;
public ShapeDecorator(Shape decoratedShape){
this.decoratedShape = decoratedShape;
}
public void draw(){
decoratedShape.draw();
}
public void f1(){
decoratedShape.f1();
}
public void f2(){
decoratedShape.f2();
}
}
//一个实际的装饰器类
public class RedShapeDecorator extends ShapeDecorator {
public RedShapeDecorator(Shape decoratedShape) {
super(decoratedShape);
}
// 这个类只想增强一下draw()方法,不想变动其他的f1,f2方法,所以这个类只需要重写这个类即可
public void draw() {
decoratedShape.draw();
setRedBorder(decoratedShape);
}
private void setRedBorder(Shape decoratedShape){
System.out.println("Border Color: Red");
}
}
//一个实际的装饰器类
public class RedShapeDecorator implements Shape {
// 每多一个装饰器类,这里需要重复
private Shape decoratedShape;
public RedShapeDecorator(Shape decoratedShape) {
this.decoratedShape = decoratedShape;
}
public void draw() {
decoratedShape.draw();
setRedBorder(decoratedShape);
}
private void setRedBorder(Shape decoratedShape){
System.out.println("Border Color: Red");
}
//这个类仅仅想增强draw方法,但是因为实现的是顶层接口,不得不重写这个方法
public void f1(){
decoratedShape.f1();
}
//这个类仅仅想增强draw方法,但是因为实现的是顶层接口,不得不重写这个方法
public void f2(){
decoratedShape.f2();
}
}