【23种设计模式】之建造者模式

本文已参与[新人创作礼]活动，一起开启掘金创作之路。

说明

• 将一个复杂对象的构建与它的表示分离，使得同样的构建过程可以创建不同的表示。

角色

• 抽象建造者
• 具体建造者
• 指挥者
• 产品
• 产品消费者

代码实现

• 利用建造者模式可以构建大对象，对外隐藏构建的逻辑

public abstract class Build {

   public abstract void setCandy(String size);

    public abstract Candy construct();

}
public class ChocolateBuild  extends Build{
   private Candy candy;

    @Override
    public void setCandy(String size) {
        candy = new ChocolateCandy();
        candy.setSize(size);
    }

    @Override
    public Candy construct() {
        this.candy.start();
        this.candy.putCandy();
        this.candy.putAdditive();
        this.candy.packCandy();
        this.candy.end();
        return candy;
    }
}
public class Client {
    private Build build;

    public void setBuild(Build build){
        this.build = build;
    }
    public Candy getSmallCandy(){
        build.setCandy("small");
        return build.construct();
    }
}
public abstract class Candy {
    private String size;

    public String getSize() {
        return size;
    }

    public void setSize(String size) {
        this.size = size;
    }

    public void start(){
        System.out.println("做糖果开始,型号:"+this.size);
    }

    public abstract void putCandy();

    public abstract void putAdditive();

    public abstract void packCandy();

    public void end(){
        System.out.println("做糖果结束");
    }
}
public class ChocolateCandy extends Candy {

    @Override
    public void putCandy() {
        System.out.println("巧克力糖果放糖");
    }

    @Override
    public void putAdditive() {
        System.out.println("巧克力糖果放巧克力");
    }

    @Override
    public void packCandy() {
        System.out.println("巧克力糖果打包");
    }
}
public class test {

    public static void main(String[] args){
        Client client = new Client();
        ChocolateBuild chocolateBuild = new ChocolateBuild();
        client.setBuild(chocolateBuild);
        Candy candy = client.getSmallCandy();
    }
}