写入csv文件获取数组越界错误

Question

我想以这种方式在csv中写入arraylist中的任何内容，无论其大小如何，但一个数组的值较少，这会导致数组越界错误，有没有办法解决这个问题？

在这个A到H中，它有自己的arraylist，有时其他数组中的元素少于A的大小，这会导致数组超出范围。

try{
        File file = new File("aaaa.csv");
        FileWriter fw = new FileWriter(file);
        BufferedWriter bw = new BufferedWriter(fw);
    
        for(int j=0;j<A.size();j++) {
            bw.write(A.get(j));
            bw.write(","+B.get(j));
            bw.write(","+C.get(j));
            bw.write(","+D.get(j));
            bw.write(","+E.get(j));
            bw.write(","+F.get(j));
            bw.write(","+G.get(j));
            bw.write(","+H.get(j));
            bw.newLine();
        }
        bw.close();
        fw.close();
         
    }
    catch(IOException e) {
        e.printStackTrace();
    }

Answer 1

您应该将列表大小与索引j的当前值进行比较

for (int j = 0; j < A.size(); j++) {  
  bw.write(A.get(j));  
  bw.write("," + (B.size() > j ? B.get(j) : ""));  
  bw.write("," + (C.size() > j ? C.get(j) : ""));  
  bw.write("," + (D.size() > j ? D.get(j) : ""));  
  bw.write("," + (E.size() > j ? E.get(j) : ""));  
  bw.write("," + (F.size() > j ? F.get(j) : ""));  
  bw.write("," + (G.size() > j ? G.get(j) : ""));  
  bw.write("," + (H.size() > j ? H.get(j) : ""));  
  bw.newLine();  
}