创建型模式：06-建造者模式

类图

image.png

示例代码：

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import com.zhs.design.builder.demo1.Player;
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public abstract class PlayerBuilder {
    private Player player = new Player();
    public abstract void buildMenu();
    public abstract void buildPlayList();
    public abstract void buildMainWindow();
    public abstract void buildProgressBar();

    public Player getPlayer() {
        return player;
    }
}
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public class CompletePlayerBuilder extends PlayerBuilder {
    @Override
    public void buildMenu() {
        this.getPlayer().setMenu("完整模式菜单");
    }

    @Override
    public void buildPlayList() {
        this.getPlayer().setPlayList("完整模式播放列表");
    }

    @Override
    public void buildMainWindow() {
        this.getPlayer().setMainWindow("完整模式主窗口");
    }

    @Override
    public void buildProgressBar() {
        this.getPlayer().setProgressBar("完整模式进度条");
    }
}
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public class MemoryPlayerBuilder extends PlayerBuilder {
    @Override
    public void buildMenu() {
        this.getPlayer().setMenu("记忆模式菜单");
    }

    @Override
    public void buildPlayList() {
        this.getPlayer().setPlayList("记忆模式播放列表");
    }

    @Override
    public void buildMainWindow() {
        this.getPlayer().setMainWindow("记忆模式主窗口");
    }

    @Override
    public void buildProgressBar() {
        this.getPlayer().setProgressBar("记忆模式进度条");
    }
}
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public class SimplePlayerBuilder extends PlayerBuilder {
    @Override
    public void buildMenu() {
        this.getPlayer().setMenu("精简模式菜单");
    }

    @Override
    public void buildPlayList() {
        this.getPlayer().setPlayList("精简模式播放列表");
    }

    @Override
    public void buildMainWindow() {
        this.getPlayer().setMainWindow("精简模式主窗口");
    }

    @Override
    public void buildProgressBar() {
        this.getPlayer().setProgressBar("精简模式进度条");
    }
}

import lombok.Data;

@Data
public class Player {
    private String menu;
    private String playList;
    private String mainWindow;
    private String progressBar;
}

public class PlayerDirector {
    public Player concrete(PlayerBuilder playerBuilder){
        playerBuilder.buildMenu();
        playerBuilder.buildPlayList();
        playerBuilder.buildMainWindow();
        playerBuilder.buildProgressBar();
        return playerBuilder.getPlayer();
    }
}

public class Main {
    /*
    * Sunny软件公司欲开发一个视频播放软件，为了给用户使用提供方便，该播放软件提供多
    种界面显示模式，如完整模式、精简模式、记忆模式、网络模式等。在不同的显示模式
    下主界面的组成元素有所差异，如在完整模式下将显示菜单、播放列表、主窗口、控制
    条等，在精简模式下只显示主窗口和控制条，而在记忆模式下将显示主窗口、控制条、
    收藏列表等。尝试使用建造者模式设计该软件。*/
    public static void main(String[] args) {
        PlayerDirector playerDirector = new PlayerDirector();
        Player player = playerDirector.concrete(new MemoryPlayerBuilder());
        System.out.println(player.toString());
    }
}

特殊建造者模式（构建器）

public class People {
    private String color;
    private Integer old;

    private People(Builder builder) {
        this.color = builder.color;
        this.old = builder.old;
    }

    public static Builder builder() {
        return new Builder();
    }
    public static class Builder {
        private String color;
        private Integer old;

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


        public Builder old(Integer old) {
            this.old = old;
            return this;
        }

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

    @Override
    public String toString() {
        return "People{" +
                "color='" + color + '\'' +
                ", old=" + old +
                '}';
    }
}

public class Main {
    public static void main(String[] args) {
        People people = People.builder().color("red").old(2).build();
        System.out.println(people.toString());
    }
}