一、问题描述
设计和实现一个双向适配器实例,使得猫Cat可以学狗Dog叫Cry(),狗可以学猫抓老鼠CatchMouse()，设计类图并编程实现。
1.类图
2.源代码
1.Cat接口：
public interface Cat {
void cry();
void catchMouse();
}
2.实体Cat类（另一个类似）：
public class ConcreteCat implements Cat{
@Override
public void cry() {
System.out.println("猫叫");
}
@Override
public void catchMouse() {
System.out.println("猫抓老鼠");
}
}
3. Dog接口
public interface Dog {
void wang(); // 狗叫的方法
void action(); // 狗学猫抓老鼠的方法，这里假设是Dog接口中新增的方法
}
4.实体Dog类
public class ConcreteDog implements Dog {
@Override
public void wang() {
System.out.println("狗叫");
}
@Override
public void action() {
System.out.println("狗抓老鼠");
}
}
5.适配器类：
public class Adapter implements Dog,Cat{
private Cat cat;
private Dog dog;
public Cat getCat() {
return cat;
}
public void setCat(Cat cat) {
this.cat = cat;
}
public Dog getDog() {
return dog;
}
public void setDog(Dog dog) {
this.dog = dog;
}
@Override
public void cry() //猫学狗叫
{
System.out.print( "猫学");
dog.wang();
}
@Override
public void catchMouse() {
cat.catchMouse();
}
@Override
public void wang() {
dog.wang();
}
@Override
public void action() //狗学猫抓老鼠
{
System.out.print( "狗学");
cat.catchMouse();
}
}
}
6.Test测试类
public class Test {
public static void main(String args[])
{
Cat cat1 = new ConcreteCat();
Dog dog1 = new ConcreteDog();
Adapter A1 = new Adapter();
A1.setCat(cat1);
A1.setDog(dog1);
cat1 = (Cat) A1;
cat1.catchMouse();
cat1.cry();
dog1 = (Dog) A1;
dog1.action();
}
}
