设计模式-建造者模式(简化-链式)

最近在学习设计模式，之前断断续续的看过好多，自己也没有专门的练习和深入了解过，一直感觉对应设计模式相关的东西还是处于懵懂状态，这次下定决心好好的学习一下，所以做一个笔记用来督促自己。

资料收集与以下网站，如有冒犯，烦请告知

https://www.runoob.com/design-pattern/builder-pattern.html

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定义

The intent of the Builder design pattern is to separate the construction of a complex object from its representation. By doing so the same construction process can create different representations.
将一个复杂对象的构建与其表示分离，使得同样的构建过程可以创建不同的表示

简单说明

1.当一个类的构建过于复杂的时候，就可以考虑builder模式了。

上手试一下，还是用coder的例子吧

1.程序员基类

public class Coder {
    private String name;//名称
    private String language;//使用的语言
    private String coding;//编程能力
    private String writeBug;//bug生成能力

    public Coder(Builder builder) {
        this.name = builder.getName();
        this.language = builder.getLanguage();
        this.coding = builder.getCoding();
        this.writeBug = builder.getWriteBug();
    }

    public void draw() {
        System.out.printf("%s程序员，使用%s编程语言，%s，%s。", name, language, coding, writeBug);
    }
}

2.builder 类

public class Builder {
    private String name;
    private String language;
    private String coding;
    private String writeBug;

    public Builder setName(String name) {
        this.name = name;
        return this;
    }

    public Builder setLanguage(String language) {
        this.language = language;
        return this;
    }

    public Builder setCoding(String coding) {
        this.coding = coding;
        return this;
    }

    public Builder setWriteBug(String writeBug) {
        this.writeBug = writeBug;
        return this;
    }

    public String getName() {
        return name;
    }

    public String getLanguage() {
        return language;
    }

    public String getCoding() {
        return coding;
    }

    public String getWriteBug() {
        return writeBug;
    }

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

3.使用一下

public class Test {
    public static void main(String[] args) {
        Coder coder = new Builder()
                .setCoding("写了一行代码")
                .setLanguage("Java")
                .setName("Android")
                .setWriteBug("没有bug")
                .build();
        coder.draw();
    }
}

4.输出信息

Android程序员，使用Java编程语言，写了一行代码，没有bug。

换一个写法

1.coder

public class Coder {
    private String name;
    private String language;
    private String coding;
    private String writeBug;

    public Coder(Builder builder) {
        this.name = builder.name;
        this.language = builder.language;
        this.coding = builder.coding;
        this.writeBug = builder.writeBug;
    }

    public void draw() {
        System.out.printf("%s程序员，使用%s编程语言，%s，%s。", name, language, coding, writeBug);
    }

    public static class Builder {
        private String name;
        private String language;
        private String coding;
        private String writeBug;

        public Builder setName(String name) {
            this.name = name;
            return this;
        }

        public Builder setLanguage(String language) {
            this.language = language;
            return this;
        }

        public Builder setCoding(String coding) {
            this.coding = coding;
            return this;
        }

        public Builder setWriteBug(String writeBug) {
            this.writeBug = writeBug;
            return this;
        }


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

    }
}

2.使用方式

public class Test {
    public static void main(String[] args) {
        Coder coder = new Coder.Builder()
                .setCoding("写了一行代码")
                .setLanguage("Java")
                .setName("Android")
                .setWriteBug("没有bug")
                .build();
        coder.draw();
    }
}