java - 仅使用 1 个 for 循环

Question

是否可以仅使用一个 for 循环而不是 2 个来执行以下操作:

int index = ws.getLastRowNum() + 1;
List<AdditiveList> list=new ArrayList<>();

for(int i=1; i<index; i++){
        list.add(new AdditiveList());
}

for(AdditiveList x: list){
         Row row=null;
         if (rowIterator.hasNext())
             row=rowIterator.next();
         x.inputAdditiveData(row);
         x.outputData();
 }

Answer 1

我认为这是可能的。

试试这个 -

int index=ws.getLastRowNum()+1;
List<AdditiveList> list=new ArrayList<>();
for(int i=1; i<index; i++){
    AdditiveList additiveList = new AdditiveList();
    Row row = null;
    if(rowIterator.hasNext())
        row = rowIterator.next();
    additiveList.inputAdditiveData(row);
    additiveList.outputData();
    list.add(additiveList);
}

<小时/>

如果 rowIterator.hasNext() 返回 false，则列表将添加 null 值。如果这是正确的，不符合要求，那么您应该省略 null，如下所示 -

for(int i=1; i<index; i++){
    if(rowIterator.hasNext()){
       Row row = rowIterator.next();
       AdditiveList additiveList = new AdditiveList();
       additiveList.inputAdditiveData(row);
       additiveList.outputData();
       list.add(additiveList);
    }        
}