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