建造者模式

/**
 * 建造者模式是将多个产品集中起来进行管理
 */
public class Builder {
    private List<Type> list = new ArrayList<Type>();

    public List<Type> getCircles(int n){
        for(int i=0;i<n;i++){
            Type circle = new Circle();
            list.add(circle);
        }
        return list;
    }

    public List<Type> getRectangle(int n){
        for(int i=0;i<n;i++){
            Type rectangle = new Rectangle();
            list.add(rectangle);
        }
        return list;
    }
}

public class Test {
    public static void main(String[] args) {
        Builder builder = new Builder();
        builder.getCircles(10);
    }
}

public interface Type {
    void show();
}

public class Circle implements Type {
    @Override
    public void show() {
        System.out.println("This is a circle type.");
    }
}

public class Rectangle implements Type {
    @Override
    public void show() {
        System.out.println("This is a rectangle type.");
    }
}