Prototype Design Pattern

最新推荐文章于 2024-03-31 20:02:09 发布

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最新推荐文章于 2024-03-31 20:02:09 发布

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文章标签： prototype object string class null

本文链接：https://blog.youkuaiyun.com/zfk/article/details/6133125

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本文介绍了一个抽象家具类及其圆形桌和方形桌两个子类的具体实现。通过实现Cloneable接口并重写clone方法，确保在进行对象复制时能够正确地深拷贝包含的Point和Rectangle对象，避免了对象间引用导致的问题。

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public abstract class AbstractFurniture implements Cloneable {
    public abstract String draw();

    protected Object clone() throws CloneNotSupportedException{
        return super.clone();
    }
}

public class CircleTable extends AbstractFurniture {
    protected Point center;


    public Point getCenter() {
        return center;
    }

    public void setCenter(Point center) {
        this.center = center;
    }

    public String draw() {
        return center.toString();
    }

    protected Object clone() throws CloneNotSupportedException {
        Object o = super.clone();
        if(this.center != null) {
            ((CircleTable)o).setCenter((Point)center.clone());
        }
        return o;
    }
}

public class SquareTable extends AbstractFurniture {
    protected Rectangle rectangle;


    public Rectangle getRectangle() {
        return rectangle;
    }

    public void setRectangle(Rectangle rectangle) {
        this.rectangle = rectangle;
    }

    public String draw() {
        return rectangle.toString();
    }

    protected Object clone() throws CloneNotSupportedException {
        Object o = super.clone();
        if(this.rectangle != null) {
            ((SquareTable)o).setRectangle((Rectangle)rectangle.clone());
        }
        return o;
    }
}