Java 返回更新的对象

如何从我提供的示例中的BasicRect剪切返回更新的矩形

只是水平切割中的

BasicRect

出现错误

public class BasicRect implements ADT_BasicRect, Comparable<BasicRect> {

    private int x, y, h, w;

    public BasicRect(int x, int y) {
        this.x = x;
        this.y = y;
        h = y;
        w = x;
    }

    public int getArea() {
        return h * w;
    }

    @Override
    public BasicRect horizontalCut(int c) {
        /**
         * Provided the cut-value is strictly between 0 and the width of this
         * BasicRect, the width of this is changed to the cut-value. The
         * BasicRect representing the right-hand part of the cut is returned.
         *
         * @param c the cut value
         * @return the right-hand part of the cut If the cut-value is not
         * strictly between 0 and the width of this, an IllegalArgumentException
         * is thrown
         */
        if(c > 0 && c < w){
            // make the cut
            x = x-w;
        }else{
            throw new IllegalArgumentException("Must be smaller than"
                    + " width but larger than 0");
        }
        return BasicRect;
    }

---

创建一个对象，更新其属性并返回它

public BasicRect horizontalCut(int c) {
    BasicRect br = new BasicRect();
    br.x = x;
    br.y = y;
    br.h = h;
    br.w = w;
    if(c > 0 && c < w){
        // make the cut
        br.x = x-w;
    }else{
        throw new IllegalArgumentException("Must be smaller than"
                + " width but larger than 0");
    }
    return br;
}

public BasicRect horizontalCut（int c）{
BasicRect br=新的BasicRect（）；
br.x=x；
br.y=y；
br.h=h；
br.w=w；
如果（c>0&&c

如果要修改当前对象并返回它，请执行此操作

public BasicRect horizontalCut(int c) {
    if(c > 0 && c < w){
        // make the cut
        x = x-w;
    }else{
        throw new IllegalArgumentException("Must be smaller than"
                + " width but larger than 0");
    }
    return this;
}

public BasicRect horizontalCut（int c）{
如果（c>0&&c

如果您想按照下面评论中的要求处理当前对象。我相信

BasicRect

是域对象，已经在某些服务中创建。这就是你需要走的路

public BasicRect horizontalCut(int c) {

    if(c > 0 && c < w){
        // make the cut
        this.x = this.x-w;
    }else{
        throw new IllegalArgumentException("Must be smaller than"
                + " width but larger than 0");
    }
    return this;
}

public BasicRect horizontalCut（int c）{
如果（c>0&&c

所以无法更新当前对象？而不是创建一个新的？嗨，伙计，有什么原因我的更新不起作用吗？只是试着测试它（检查我的编辑），我相信它应该是x=x-c而不是-w，这是我的错误什么是“工作”？它应该编译，移动rect不会影响它的区域。

this.x=this.x-this.x

看起来像

this.x=0谢谢。更正打字错误
public BasicRect horizontalCut(int c) {

    if(c > 0 && c < w){
        // make the cut
        this.x = this.x-w;
    }else{
        throw new IllegalArgumentException("Must be smaller than"
                + " width but larger than 0");
    }
    return this;
}