设计模式——构造者模式

构造器模式_组装复杂实例（逐步构造出一个复杂的实例

 

/**
 * 指挥者
 * @author maikec
 * @date 2019/5/11
 */
public class director {
    private final abstractbuilder builder;
    public director(abstractbuilder builder){
        this.builder = builder;
    }
    public void buildermessage(){
        builder.createhead();
        builder.createbody();
        builder.signature();
    }
}

/**
 * 抽象构造器
 * @author maikec
 * @date 2019/5/11
 */
public abstract class abstractbuilder {
    protected message message;
    protected head head;
    protected body body;
    protected author author;
    /**
     * 创建消息头部
     * @return
     */
    protected abstract head createhead();

    /**
     * 创建消息体
     * @return
     */
    protected abstract body createbody();

    /**
     * 署名
     * @return
     */
    protected abstract author signature();

    public message getmessage(){
        return message;
    }
}

/**
 * @author maikec
 * @date 2019/5/11
 */
public class message {
    private head head;
    private body body;
    private author author;
    public message(){}
    public message(head head,body body,author author){
        this.head = head;
        this.body = body;
        this.author = author;
    }

    @override
    public string tostring() {
         super.tostring();
         if (head !=null || body != null || author != null){
             stringbuffer sb = new stringbuffer( "[" );
             if (head != null){
                 sb.append( head.tostring() );
             }
             if (body != null){
                 sb.append( body.tostring() );
             }
             if (author != null){
                 sb.append( author.tostring() );
             }
             sb.append( "]" );
             return sb.tostring();
         }
         return null;
    }
}

/**
 * @author maikec
 * @date 2019/5/11
 */
public class head {
    private string name;
    public head(){}
    public head(string name){
        this.name = name;
    }
    @override
    public string tostring() {
        super.tostring();
        return name == null ? "head" : name;
    }
}

/**
 * @author maikec
 * @date 2019/5/11
 */
public class body {
    private string name;
    public body(){}
    public body(string name) {
        this.name = name;
    }

    @override
    public string tostring() {
         super.tostring();
         return name == null ? "body" : name;
    }
}

/**
 * @author maikec
 * @date 2019/5/11
 */
public class author {
    private string name;
    public author(){}
    public author(string name) {
        this.name = name;
    }

    @override
    public string tostring() {
         super.tostring();
         return name == null ? "author" : name;
    }
}

/**
 * email构造器
 * @author maikec
 * @date 2019/5/11
 */
public class emailbuilder extends abstractbuilder {
    @override
    protected head createhead() {
         head = new head("email head");
         return head;
    }

    @override
    protected body createbody() {
        body = new body("email body");
        return body;
    }

    @override
    protected author signature() {
        author =  new author("maikec");
        return author;
    }

    @override
    public message getmessage() {
        return new message( head,body,author );
    }
}

附录

github.com/maikec/patt… 个人github设计模式案例

声明

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