设计模式 - 简单工厂模式

package com.swt.dp.factory;

/**
 * 书
 */
public abstract class Book {

    /**
     * 打印书籍名字
     */
    public abstract void printName();

}

package com.swt.dp.factory;

/**
 * 英语书
 */
public class EnglishBook extends Book {

    @Override
    public void printName() {
        System.out.println("this is 《English Book》");
    }
}

package com.swt.dp.factory;

/**
 * Java编程
 */
public class JavaBook extends Book {

    @Override
    public void printName() {
        System.out.println("this is 《Java Book》");
    }

}

package com.swt.dp.factory;

/**
 * 数学书
 */
public class MathematicsBook extends Book {

    @Override
    public void printName() {
        System.out.println("this is 《Mathematics Book》");
    }

}

package com.swt.dp.factory;

/**
 * 简单工厂模式
 */
public class BookFactory {

    /**
     * 生产书籍
     * @param name  书籍名字
     * @return      书籍
     */
    public static Book creatBook(String name) {
        switch (name) {
            case "English" : {
                return new EnglishBook();
            }
            case "Java" : {
                return new JavaBook();
            }
            case "Mathematics" : {
                return new MathematicsBook();
            }
            default:{
                break;
            }
        }
        return null;
    }

}

package com.swt.dp.factory;

public class Client {

    public static void main(String[] args) {
        Book book = BookFactory.creatBook("English");
        book.printName();

        book = BookFactory.creatBook("Java");
        book.printName();

        book = BookFactory.creatBook("Mathematics");
        book.printName();
    }

}

this is 《English Book》
this is 《Java Book》
this is 《Mathematics Book》