设计模式之生成器模式

将一个复杂对象的创建和它的表示分离，使得同样的创建过程可以有不同的表示。

应用场景：一水杯工厂要生产各式各样的水杯，无论杯子是神马造型，但都包括绳子，帽子和杯体。以此模型创建各种类型的杯子。

类图

cup类

public class Cup {

    private String string;    //绳子
    private String cap;       //帽子
    private String cupBody;   //杯体

    public void setString(String string) {
        this.string = string;
    }
    public void setCap(String cap) {
        this.cap = cap;
    }
    public void setCupBody(String cupBody) {
        this.cupBody = cupBody;
    }

    public void show() {
        System.out.println("杯子生产完毕");
    }

}

Builder类

public abstract class  Builder {

protected Cup cup = new Cup();

public abstract void buildString();

public abstract void buildCap();

public abstract void buildCupBody();

public  Cup getResult() {
return cup;
}

}

ClassCup类

public class ClassCup extends Builder {

    @Override
    public void buildString() {
        cup.setString("生产绳子...");
        System.out.println("生产绳子...");
    }

    @Override
    public void buildCap() {
        cup.setCap("生产帽子...");
        System.out.println("生产帽子...");
    }

    @Override
    public void buildCupBody() {
        cup.setCupBody("生产杯体...");
        System.out.println("生产杯体...");
    }


}

Director类

public class Director {

    private Builder builder;

    public Director(Builder builder) {
        this.builder = builder;
    }

    public void create() {
        builder.buildString();
        builder.buildCap();
        builder.buildCupBody();
        builder.getResult().show();
    }

    public static void main(String[] args) {
        Director d = new Director(new ClassCup());
        d.create();
    }

}

运行结果：