JDK1.8-01行为化参数

1  行为参数化演进

行为参数化：将具体的执行行为以参数化形式传入方法中。已快速适应复杂多变的需求

行为化参数实现方式：

（1）类

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- 接口定义方法，实现定义具体的行为。方法中存入具体行为执行具体逻辑【策略模式】

缺点：扩展性强

缺点：代码量大

参考代码

参考类图

（2）匿名类

@Test
public void anonyMousClass(){
    CookingRoomClass cookingRoom = new CookingRoomClass();
    cookingRoom.cooking(new CookingFood() {
        @Override
        public void cooking() {
            System.out.println("做好一份汉堡！");
        }
    });
    cookingRoom.cooking(new CookingFood() {
        @Override
        public void cooking() {
            System.out.println("做好了一份鸡腿饭！");
        }
    });
}

（3）lambda

public static void main(String[] args) {
    List<Apple> apples = filterApples(LambdaTest.apples, (Apple apple) -> "red".equals(apple.getColor()));
    Assert.assertEquals(4,apples.size());
}

（4）泛型参数化+lambda

@Test
public void genericParam(){
    List<Apple> tList = filter(apples, (Apple apple) -> "red".equals(apple.getColor()));
    Assert.assertEquals(4,tList.size());
}
public static <T> List<T> filter(List<T> t,Predicate<T> predicate){
    List<T> tList = new ArrayList<>();
    for (T t1:tList) {
        if(predicate.test(t1)){
            tList.add(t1);
        }
    }
    return tList;
}
public interface Predicate<T> {
    public Boolean  test(T t);
}