设计模式课程 设计模式精讲 7-2 建造者模式Coding

1　　　　代码演练

1.1　　建造者模式演练

1.2　　静态内部类演练建造者模式（链式调用）

1　　　　代码演练

1.1　　建造者模式演练

需求：

根据讲师提供的课程名称，课程ppt，课程视频，课程手记，课程问答 制作教学课程。

重点：

教练类coach.java标红部分，builder设值，然后赋值（看test.java）。

uml类图：

测试类：

package com.geely.design.pattern.creational.builder;

public class Test {
    public static void main(String [] args){
        Coach coach = new Coach();
        Course course = new Course();
        CourseBuilder courseBuilder = new CourseActualBuilder();
        coach.setCourseBuilder(courseBuilder);

        course=coach.makeCourse("设计模式","设计模式PPT","设计模式标题","设计模式视频","设计模式课程问答");
        System.out.println(course.toString());
    }
}

实体课程类：

package com.geely.design.pattern.creational.builder;

public class Course {
    private String courseName;
    private String coursePPT;
    private String courseArticle;
    private String courseVideo;
    private String courseQA;

    public void setCourseName(String courseName) {
        this.courseName = courseName;
    }

    public void setCoursePPT(String coursePPT) {
        this.coursePPT = coursePPT;
    }

    public void setCourseArticle(String courseArticle) {
        this.courseArticle = courseArticle;
    }

    public void setCourseVideo(String courseVideo) {
        this.courseVideo = courseVideo;
    }

    public void setCourseQA(String courseQA) {
        this.courseQA = courseQA;
    }

    /**
     * toString方法，为了方便测试，进行打印
     * @return
     */
    @Override
    public String toString() {
        return "Course{" +
                "courseName='" + courseName + '\'' +
                ", coursePPT='" + coursePPT + '\'' +
                ", courseArticle='" + courseArticle + '\'' +
                ", courseVideo='" + courseVideo + '\'' +
                ", courseQA='" + courseQA + '\'' +
                '}';
    }
}

教练类：

package com.geely.design.pattern.creational.builder;

public class Coach {
    CourseBuilder courseBuilder;

    public void setCourseBuilder(CourseBuilder courseBuilder) {
        this.courseBuilder = courseBuilder;
    }

    public Course makeCourse(String courseName, String coursePPT, String courseArticle, String courseVideo, String courseQA){
        this.courseBuilder.buildCourseName(courseName);
        this.courseBuilder.buildCourseArticle(courseArticle);
        this.courseBuilder.buildCourseVideo(courseVideo);
        this.courseBuilder.buildCoursePPT(coursePPT);
        this.courseBuilder.buildCourseQA(courseQA);
        return this.courseBuilder.makeCourse();

    }
}

建造实现类：

package com.geely.design.pattern.creational.builder;

public class CourseActualBuilder extends CourseBuilder{

    private Course course = new Course();
    @Override
    public void buildCourseName(String courseName) {
       course.setCourseName(courseName);
    }

    @Override
    public void buildCoursePPT(String coursePPT) {
        course.setCoursePPT(coursePPT);
    }

    @Override
    public void buildCourseArticle(String courseArticle) {
        course.setCourseArticle(courseArticle);
    }

    @Override
    public void buildCourseVideo(String courseVideo) {
        course.setCourseVideo(courseVideo);
    }

    @Override
    public void buildCourseQA(String courseQA) {
        course.setCourseQA(courseQA);
    }

    @Override
    public Course makeCourse() {
        return this.course;
    }
}

建造抽象类：

package com.geely.design.pattern.creational.builder;

/**
 * 这里使用 抽象类，完全是我练手用的，用实时接口也可以
 */
public abstract class CourseBuilder{

    public abstract void buildCourseName(String courseName);
    public abstract void buildCoursePPT(String coursePPT);
    public abstract void buildCourseArticle(String courseArticle);
    public abstract void buildCourseVideo(String courseVideo);
    public abstract void buildCourseQA(String courseQA);

    public abstract  Course makeCourse();

}

打印结果：

"C:\Program Files\Java\jdk1.7.0_79\bin\java.exe" "-javaagent:D:\java\devolopKit\idea\anZh\IntelliJ IDEA Community Edition 2018.1.4\lib\idea_rt.jar=12439:D:\java\devolopKit\idea\anZh\IntelliJ IDEA Community Edition 2018.1.4\bin" -Dfile.encoding=UTF-8 -classpath "C:\Program Files\Java\jdk1.7.0_79\jre\lib\charsets.jar;C:\Program Files\Java\jdk1.7.0_79\jre\lib\deploy.jar;C:\Program Files\Java\jdk1.7.0_79\jre\lib\ext\access-bridge-64.jar;C:\Program Files\Java\jdk1.7.0_79\jre\lib\ext\dnsns.jar;C:\Program Files\Java\jdk1.7.0_79\jre\lib\ext\jaccess.jar;C:\Program Files\Java\jdk1.7.0_79\jre\lib\ext\localedata.jar;C:\Program Files\Java\jdk1.7.0_79\jre\lib\ext\sunec.jar;C:\Program Files\Java\jdk1.7.0_79\jre\lib\ext\sunjce_provider.jar;C:\Program Files\Java\jdk1.7.0_79\jre\lib\ext\sunmscapi.jar;C:\Program Files\Java\jdk1.7.0_79\jre\lib\ext\zipfs.jar;C:\Program Files\Java\jdk1.7.0_79\jre\lib\javaws.jar;C:\Program Files\Java\jdk1.7.0_79\jre\lib\jce.jar;C:\Program Files\Java\jdk1.7.0_79\jre\lib\jfr.jar;C:\Program Files\Java\jdk1.7.0_79\jre\lib\jfxrt.jar;C:\Program Files\Java\jdk1.7.0_79\jre\lib\jsse.jar;C:\Program Files\Java\jdk1.7.0_79\jre\lib\management-agent.jar;C:\Program Files\Java\jdk1.7.0_79\jre\lib\plugin.jar;C:\Program Files\Java\jdk1.7.0_79\jre\lib\resources.jar;C:\Program Files\Java\jdk1.7.0_79\jre\lib\rt.jar;F:\xiangmu3\Xin\Idea\design_pattern\target\classes" com.geely.design.pattern.creational.builder.Test
Course{courseName='设计模式', coursePPT='设计模式PPT', courseArticle='设计模式标题', courseVideo='设计模式视频', courseQA='设计模式课程问答'}

Process finished with exit code 0

1.2　　静态内部类演练建造者模式（链式调用）

uml类图：

和1.1 区别：
1.2　　可以少设值，而1.1不可以

自己理解：

静态内部类builder有5个属性，课程类有相同的5个属性，链式调用的时候，给builder全部或者部分赋值，build的时候，把builder对象传送到course，course获取到builder的属性，然后返回这个course；

测试类：

package com.geely.design.pattern.creational.builder.v2;

public class Test {
    public static void main(String [] args){
        Course.CourseBuilder courseBuilder = new Course.CourseBuilder();
        Course course =  courseBuilder.buildCourseName("设计模式课程标题").buildCourseVideo("设计模式视频").build();
        System.out.println(course);
    }
}

课程类：（静态内部类链式调用）

package com.geely.design.pattern.creational.builder.v2;

public class Course {
    private String courseName;
    private String coursePPT;
    private String courseArticle;
    private String courseVideo;
    private String courseQA;

    public Course(CourseBuilder courseBuilder){
        this.courseName = courseBuilder.courseName;
        this.courseArticle = courseBuilder.courseArticle;
        this.coursePPT = courseBuilder.coursePPT;
        this.courseVideo = courseBuilder.courseVideo;
        this.courseQA = courseBuilder.courseQA;
    }

    /**
     * toString方法，为了方便测试，打印对象的时候，能够打印出对象的属性
     * @return
     */
    @Override
    public String toString() {
        return "Course{" +
                "courseName='" + courseName + '\'' +
                ", coursePPT='" + coursePPT + '\'' +
                ", courseArticle='" + courseArticle + '\'' +
                ", courseVideo='" + courseVideo + '\'' +
                ", courseQA='" + courseQA + '\'' +
                '}';
    }

    /**
     * 编写静态内部类，实现链式调用
     */
    public static class CourseBuilder{
        private String courseName;
        private String coursePPT;
        private String courseArticle;
        private String courseVideo;
        private String courseQA;

        public CourseBuilder buildCourseName(String courseName) {
            this.courseName = courseName;
            return this;
        }

        public CourseBuilder buildCoursePPT(String coursePPT) {
            this.coursePPT = coursePPT;
            return this;
        }

        public CourseBuilder buildCourseArticle(String courseArticle) {
            this.courseArticle = courseArticle;
            return this;
        }

        public CourseBuilder buildCourseVideo(String courseVideo) {
            this.courseVideo = courseVideo;
            return this;
        }

        public CourseBuilder buildCourseQA(String courseQA) {
            this.courseQA = courseQA;
            return this;
        }

        public Course build(){
            return new Course(this);
        }

    }
}

打印日志：

"C:\Program Files\Java\jdk1.7.0_79\bin\java.exe" "-javaagent:D:\java\devolopKit\idea\anZh\IntelliJ IDEA Community Edition 2018.1.4\lib\idea_rt.jar=13237:D:\java\devolopKit\idea\anZh\IntelliJ IDEA Community Edition 2018.1.4\bin" -Dfile.encoding=UTF-8 -classpath "C:\Program Files\Java\jdk1.7.0_79\jre\lib\charsets.jar;C:\Program Files\Java\jdk1.7.0_79\jre\lib\deploy.jar;C:\Program Files\Java\jdk1.7.0_79\jre\lib\ext\access-bridge-64.jar;C:\Program Files\Java\jdk1.7.0_79\jre\lib\ext\dnsns.jar;C:\Program Files\Java\jdk1.7.0_79\jre\lib\ext\jaccess.jar;C:\Program Files\Java\jdk1.7.0_79\jre\lib\ext\localedata.jar;C:\Program Files\Java\jdk1.7.0_79\jre\lib\ext\sunec.jar;C:\Program Files\Java\jdk1.7.0_79\jre\lib\ext\sunjce_provider.jar;C:\Program Files\Java\jdk1.7.0_79\jre\lib\ext\sunmscapi.jar;C:\Program Files\Java\jdk1.7.0_79\jre\lib\ext\zipfs.jar;C:\Program Files\Java\jdk1.7.0_79\jre\lib\javaws.jar;C:\Program Files\Java\jdk1.7.0_79\jre\lib\jce.jar;C:\Program Files\Java\jdk1.7.0_79\jre\lib\jfr.jar;C:\Program Files\Java\jdk1.7.0_79\jre\lib\jfxrt.jar;C:\Program Files\Java\jdk1.7.0_79\jre\lib\jsse.jar;C:\Program Files\Java\jdk1.7.0_79\jre\lib\management-agent.jar;C:\Program Files\Java\jdk1.7.0_79\jre\lib\plugin.jar;C:\Program Files\Java\jdk1.7.0_79\jre\lib\resources.jar;C:\Program Files\Java\jdk1.7.0_79\jre\lib\rt.jar;F:\xiangmu3\Xin\Idea\design_pattern\target\classes" com.geely.design.pattern.creational.builder.v2.Test
Course{courseName='设计模式课程标题', coursePPT='null', courseArticle='null', courseVideo='设计模式视频', courseQA='null'}

Process finished with exit code 0