Question

我有一个名为x=points的数组。在这个数组中有十个坐标（无论如何都是x部分）。我想为数组中的每个点添加10 * c的值。此外，这是在java。

我该怎么做？

for (int c = 0; c <= 9; c++) {
for(int k = 0; k <= 9; k++) {
        if (k%2 == 0) {
            xpoints[k] = (int) (20*Math.cos((k*3.14/5)+3*3.14/2)) +60;
            ypoints[k] = (int) (20*Math.sin((k*3.14/5)+3*3.14/2)) +60;
        } else if (k%2 == 1) {
            xpoints[k] = (int) (8*Math.cos((k*3.14/5)+3*3.14/2)) +60;
            ypoints[k] = (int) (8*Math.sin((k*3.14/5)+3*3.14/2)) +60;
            }
        }
    // This is where I am having trouble
    xpoints[] = xpoints + 5*c;
    g.fillPolygon(xpoints, ypoints, npoints);
}

Answer 1

// This is where I am having trouble
xpoints[] = xpoints + 5*c;

要更新数组中索引i的值，请通过索引访问它并重新分配更新后的值：

xpoints[i] = xpoints[i] + 10 * c;

或更短：

xpoints[i] += 10 * c;

循环遍历整个数组并更新每个单独的值：

for (int i = 0; i < xpoints.length; i++) {
  xpoints[i] += 10 * c;
}

或者使用Java 8流：

xpoints = Arrays.stream(xpoints).map(xpoint -> xpoint + 10 * c).toArray();

将值添加到数组的内容

1 个答案: