创建型模式：02-工厂方法模式

类图：

image.png

示例代码：

image.png

package com.zhs.design.factory.method.factory;
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public interface PictureReaderFactory {
    PictureReader creatReader();
}
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public class GifReaderFactory implements PictureReaderFactory {
    @Override
    public PictureReader creatReader() {
        return new GifReader();
    }
}
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public class JpgReaderFactory implements PictureReaderFactory {
    @Override
    public PictureReader creatReader() {
        return new JpgReader();
    }
}
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public class PngReaderFactory implements PictureReaderFactory {
    @Override
    public PictureReader creatReader() {
        return new PngReader();
    }
}

package com.zhs.design.factory.method.reader;
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public interface PictureReader {
    String read(String png);
}
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public class GifReader implements PictureReader {
    public GifReader() {
        System.out.println("创建GIF图片读取器成功！");
    }
    @Override
    public String read(String gif) {
        return "读取的GIF图片的内容为："+gif;
    }
}
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public class JpgReader implements PictureReader {
    public JpgReader() {
        System.out.println("创建JPG图片读取器成功！");

    }
    @Override
    public String read(String jpg) {
        return "读取的JPG图片的内容为："+jpg;
    }
}
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public class PngReader implements PictureReader {
    public PngReader() {
        System.out.println("创建PNG图片读取器成功！");
    }

    @Override
    public String read(String png) {
        return "读取的PNG图片的内容为："+png;
    }
}

package com.zhs.design.factory.method;

public class Client {
    public static void main(String[] args) {
        PictureReaderFactory factory = new GifReaderFactory();
        PictureReader reader = factory.creatReader();
        System.out.println(reader.read("我是猫咪图片"));
    }
}

运行结果：

image.png