黑马JAVA P199 补充知识：工厂模式、装饰模式

package com.itheima.d3_factory_pattern;

public class FactoryPattern {
    
    public  static  Computer createComputer(String info){
        switch (info){
            case"huawei":
                Computer c = new Huawei();
                c.setName("huawei pro 16");
                c.setPrice(5999);
                return c;
            case"mac":
                Computer c2 = new Mac();
                c2.setName("MacBook pro");
                c2.setPrice(11999);
                return c2;
            default:
                return null;

        }
    }
}

package com.itheima.d3_factory_pattern;

public class FactoryDemo {
    public static void main(String[] args) {
        Computer c1 = FactoryPattern.createComputer("huawei");
        c1.start();

        Computer c2 = FactoryPattern.createComputer("mac");
        c2.start();
    }
}

package com.itheima.d3_factory_pattern;

public class Huawei extends Computer{
    @Override
    public void start() {
        System.out.println(getName() + "开机了，展示了华为的菊花图标~~~");
    }
}

package com.itheima.d3_factory_pattern;

public class Mac extends Computer{

    @Override
    public void start() {
        System.out.println(getName() + "以非常优雅的方法启动了，展示了一个苹果logo");
    }
}

package com.itheima.d3_factory_pattern;

public abstract class Computer {
    private String name;
    private double price;

    public abstract void start();

    public String getName() {
        return name;
    }

    public void setName(String name) {
        this.name = name;
    }

    public double getPrice() {
        return price;
    }

    public void setPrice(double price) {
        this.price = price;
    }
}

package com.itheima.d4_decorator_pattern;


public abstract class InputStream {
    public abstract int read();
    public abstract int read(byte[] buffer);


}

package com.itheima.d4_decorator_pattern;

import java.util.Arrays;

public class FileInputStream extends InputStream{
    @Override
    public int read() {
        System.out.println("低性能的方式读取了一个字节a");
        return 97;
    }

    @Override
    public int read(byte[] buffer) {
        buffer[0] = 97;
        buffer[1] = 98;
        buffer[2] = 99;
        System.out.println("低性能的方式读取了一个字节数组：" + Arrays.toString(buffer));
        return 0;
    }
}

package com.itheima.d4_decorator_pattern;


public class BufferedInputStream extends InputStream{
    private  InputStream is;
    public BufferedInputStream(InputStream is){
        this.is = is;
    }

    @Override
    public int read() {
        System.out.println("提供8KB的缓冲区，提高读数据性能~~~");
        return is.read();
    }

    @Override
    public int read(byte[] buffer) {
        System.out.println("提供8KB的缓冲区，提高读数据性能~~~");
        return is.read(buffer);
    }

}

package com.itheima.d4_decorator_pattern;


public class DecoratorPattern {
    public static void main(String[] args) {
        InputStream is = new BufferedInputStream(new FileInputStream());
        System.out.println(is.read());
        System.out.println(is.read(new byte[3]));
    }
}