java - 在嵌套数组中提取数组 Java

Question

我有以下代码:

DataPoint dbPoint[] = new DataPoint[] {
                new DataPoint(0, 1),
                new DataPoint(1, 5),
                new DataPoint(2, 3),
                new DataPoint(3, 2),
                new DataPoint(4, 6)
        };

我希望删除其中的新 DataPoint(x, y) 值，这样我就可以执行以下操作:

DataPoint dbPoint[] = new DataPoint[] {};
dbPoint[].add(new Data(1,1);
dbPoint[].add(new Data(2,5);
dbPoint[].add(new Data(3,7);
dbPoint[].add(new Data(4,3);
dbPoint[].add(new Data(5,9);

谢谢!

Answer 1

构建一个List并使用toArray()转换为数组。
请记住，数组无法调整大小，但像 List 这样的集合可以。

ArrayList<DataPoint> points = new ArrayList<>();
points.add(new DataPoint(0, 1));
points.add(new DataPoint(1, 5));
points.add(new DataPoint(2, 3));
points.add(new DataPoint(3, 2));
points.add(new DataPoint(4, 6));
DataPoint[] dbPoint = points.toArray(new DataPoint[points.size()]);

LineGraphSeries<DataPoint> series = new LineGraphSeries<>(dbPoint);