Java_静态代理与Lambda

静态代理

要点:

公共接口

真实角色

代理角色

public class StaticProxy {
	public static void main(String[] args) {
		You you = new You();
		WeddingCompany com = new WeddingCompany(you);
		com.happyMarry();

		System.out.println("####################");

		new WeddingCompany(new You()).happyMarry();

		//new Thread(线程对象).start();
	}

}

interface Marry{
	void happyMarry();
}

class You implements Marry{

	@Override
	public void happyMarry() {
		System.out.println("我花开尽百花杀");
	}
}
// 代理角色
class WeddingCompany implements Marry {
	// 真实角色
	private Marry target;

	public WeddingCompany(Marry target) {
		super();
		this.target = target;
	}

	@Override
	public void happyMarry() {
		ready();
		this.target.happyMarry();
		after();
	}

	private void ready() {
		System.out.println("待到秋来九月八");
	}

	private void after() {
		System.out.println("冲天香阵透长安");
	}
}

/*
待到秋来九月八
我花开尽百花杀
冲天香阵透长安
####################
待到秋来九月八
我花开尽百花杀
冲天香阵透长安
满城尽带黄金甲(这句是来凑数的)
*/

lambda

使用lambda可避免匿名内部类定义过多

实质输入函数式编程的概念

(params) -> expression
(params) -> statement
(params) -> {statements}

/***************匿名内部类与接口同名时*************/
/**
 * 匿名内部类与接口同名
 * @author Administrator
 *
 */
public class TestHaHa {

	public static void main(String[] args) {
		ILike_1 like = new ILike_1() {
			public void lambda() {
				System.out.println("I like lambda(匿名内部类).");
			}
		};
		like.lambda();

		// 这个和接口同名匿名内部类必须实现接口中的方法, 否则报错
//		ILike_1 like_1 = new ILike_1() {
//			public void lambda_1() {
//				System.out.println("I like lambda(匿名内部类).");
//			}
//		};
	}

}

interface ILike_1{
	void lambda();
}
/*
I like lambda(匿名内部类).
*/

/**************lambda无参数形式**************/
public class LambdaTest01 {
	// 静态内部类
	static class Like2 implements ILike{
		@Override
		public void lambda() {
			System.out.println("I like lambda(静态内部类).");
		}
	}

	public static void main(String[] args) {
		ILike like = new Like();
		like.lambda();

		like = new Like2();
		like.lambda();

		class Like3 implements ILike{
			@Override
			public void lambda() {
				System.out.println("I like lambda(方法内部类).");
			}
		}
		like = new Like3();
		like.lambda();

		// 匿名内部类
		like = new ILike() {
			public void lambda() {
				System.out.println("I like lambda(匿名内部类).");
			}
		};
		like.lambda();

		// lambda,
		like = ()->{
			System.out.println("I like lambda(lambda).");
		};
		like.lambda();

		/********lambda推到必须存在类型*****************
		()->{
			System.out.println("I like lambda(lambda).");
		};
		like.lambda();
		*/
	}
}

interface ILike{
	void lambda();
}

 // 外部类
class Like implements ILike{

	@Override
	public void lambda() {
		System.out.println("I like lambda(外部类).");
	}
}

/*
I like lambda(外部类).
I like lambda(静态内部类).
I like lambda(方法内部类).
I like lambda(匿名内部类).
I like lambda(lambda).
*/

/************一个形参**************/
public class LambdaTest02 {

	public static void main(String[] args) {
		ILove love = (int a) -> {
			System.out.println("I like lambda(外部类)---->" + a);
		};
		love.lambda(100);

		// 简化
		love = (a) -> {
			System.out.println("I like lambda(外部类)---->" + a);
		};
		love.lambda(50);

		// 简化, 只有一个参数时
		love = a -> {
			System.out.println("I like lambda(外部类)---->" + a);
		};
		love.lambda(5);

		// 简化, 只有一行代码时, 多行代码不能简化
		love = a -> System.out.println("I like lambda(外部类)---->" + a);
		love.lambda(0);
	}
}

interface ILove{
	void lambda(int a);
}

 // 外部类
class Love implements ILove{

	@Override
	public void lambda(int a) {
		System.out.println("I like lambda(外部类)---->" + a);
	}
}

/*
I like lambda(外部类)---->100
I like lambda(外部类)---->50
I like lambda(外部类)---->5
I like lambda(外部类)---->0
*/

/************形参+返回值**************/
public class LambdaTest03 {
	public static void main(String[] args) {
		IInterest interest = (int a1, int b1) -> {
			System.out.println("I like lambda(外部类)---->" + a1 + b1);
			return a1 + b1;
		};
		System.out.println(interest.lambda(100, 200));

		// 简化
		interest = (a1, b1) -> {
			System.out.println("I like lambda(外部类)---->" + a1 + b1);
			return a1 + b1;
		};
		interest.lambda(100, 40);

		interest = (a, c) -> {return a + c;};

		interest = (a, c) -> a + c;

		interest = (a, c) -> 0;

		System.out.println(interest.lambda(10, 29));
	}
}

interface IInterest{
	int lambda(int a, int b);
}

 // 外部类
class Interest implements IInterest{

	@Override
	public int lambda(int a1, int b1) {
		System.out.println("I like lambda(外部类)---->" + a1 + b1);
		return a1 + b1;
	}
}

/*
I like lambda(外部类)---->100200
300
I like lambda(外部类)---->10040
0
*/

/*****************还能这么玩*****************/
public class TestHaHa {

	public static void main(String[] args) {
		ILike_1 like_1 = () -> {
				System.out.println("haha");
		};

		like_1.haha();
	}

}

interface ILike_1{
	void haha();
}

/*
haha
*/

/************Thread + Lambda**************/
public class LambdaTest04 {
	public static void main(String[] args) {
		new Thread(()->{
			System.out.println("学习lambda");
		}).start();
		new Thread(()->System.out.println("学习lambda")).start();
	}
}

/*
学习lambda
学习lambda
*/