设计模式
1.对象模式三剑客：建设者模式 工厂模式 抽象工厂模式
1、建设者模式：
public class User {
private String name;
private static int test=1;
private String pwd;
public String getName() {
return name;
}
public void setName(String name) {
this.name = name;
}
public String getPwd() {
return pwd;
}
public void setPwd(String pwd) {
this.pwd = pwd;
}
private User(String name,String pwd){
this.name = name;
this.pwd = pwd;
}
@Override
public String toString() {
return test+name+pwd;
}
public static class UserBuilder{
private String name;
private String pwd;
public UserBuilder setName(String name) {
this.name = name;
return this;
}
public UserBuilder setPwd(String pwd) {
this.pwd = pwd;
return this;
}
public User build(){
System.out.println(toString());
return new User(name,pwd);
}
@Override
public String toString() {
return test+name+pwd;
}
}
}
链式调用：
User user =new User.UserBuilder().setName("ss").setPwd(".").build();
user.toString();
2、工厂模式：
Meal fruit = Meal.valueOf("banana");
Meal vegetable = Meal.valueOf("carrot");
class Meal {
private String type;
public Meal(String type) {
this.type = type;
}
public String getType() {
return this.type;
}
// Example of factory method - different object is created depending on current context
public static Meal valueOf(String ingredient) {
if (ingredient.equals("banana")) {
return new Meal("fruit");
}
return new Meal("vegetable");
}
}
3.抽象工厂：
public class FactoryTest {
// Test method which is the client
@Test
public void test() {
Kitchen factory = new KitchenFactory();
KitchenMeal meal = factory.getMeal("P.1");
KitchenMeal dessert = factory.getDessert("I.1");
assertTrue("Meal's name should be 'protein meal' and was '"+meal.getName()+"'", meal.getName().equals("protein meal"));
assertTrue("Dessert's name should be 'ice-cream' and was '"+dessert.getName()+"'", dessert.getName().equals("ice-cream"));
}
}
// abstract factory
abstract class Kitchen {
public abstract KitchenMeal getMeal(String preferency);
public abstract KitchenMeal getDessert(String preferency);
}
// concrete factory
class KitchenFactory extends Kitchen {
@Override
public KitchenMeal getMeal(String preferency) {
if (preferency.equals("F.1")) {
return new FastFoodMeal();
} else if (preferency.equals("P.1")) {
return new ProteinMeal();
}
return new VegetarianMeal();
}
@Override
public KitchenMeal getDessert(String preferency) {
if (preferency.equals("I.1")) {
return new IceCreamMeal();
}
return null;
}
}
// abstract product
abstract class KitchenMeal {
public abstract String getName();
}
// concrete products
class ProteinMeal extends KitchenMeal {
@Override
public String getName() {
return "protein meal";
}
}
class VegetarianMeal extends KitchenMeal {
@Override
public String getName() {
return "vegetarian meal";
}
}
class FastFoodMeal extends KitchenMeal {
@Override
public String getName() {
return "fast-food meal";
}
}
class IceCreamMeal extends KitchenMeal {
@Override
public String getName() {
return "ice-cream";
}
}
