java - 学校项目，数组索引超出范围异常(exception):2

我目前正在为一个学校项目工作，并且正在观看视频教程，我对编码还很陌生。据我所知，一切看起来都不错，但是当我运行预览时，它向我发送了一个空白窗口，错误为“ ArrayIndexOutOfBoundsException：2”

PShape baseMap;
String csv[];
String myData[][];

//Setup BaseMap and csv info

void setup() {
 size(1800, 900);
 noLoop();
 baseMap = loadShape("WorldMap.svg");
 csv = loadStrings("FlightCancellations.csv");
 myData = new String[csv.length][4];
 for(int i=0; i<csv.length; i++) {
 myData[i] = csv[i].split(",");

  }
}


//draw
void draw() {
  shape(baseMap, 0, 0, width, height);
  noStroke();
  fill(255, 0, 0, 50);

  for(int i=0; i<myData.length; i++){


    float graphLong = map(float(myData[i][2]), -180, 180, 0, width);
   float graphLat = map(float(myData[i][3]), -90, 90, 0, height);

          println(graphLong + " / " + graphLat);

   ellipse(graphLong, graphLat, 10, 10);

  }
}

另外，映射的图像可以正常工作，直到我添加

for(int i=0; i<myData.length; i++){


    float graphLong = map(float(myData[i][2]), -180, 180, 0, width);
   float graphLat = map(float(myData[i][3]), -90, 90, 0, height);

          println(graphLong + " / " + graphLat);

最佳答案

在程序中使用数据之前，应养成检查数据是否存在的习惯：

for(int i=0; i<myData.length; i++) {
    if (myData[i].length > 3) { // Check that the array has at least 4 entries
        float graphLong = map(float(myData[i][2]), -180, 180, 0, width);
        float graphLat = map(float(myData[i][3]), -90, 90, 0, height);
        println(graphLong + " / " + graphLat);
        ellipse(graphLong, graphLat, 10, 10);
    }
}