我正在尝试使用扫描仪一次读入几行输入。我认为使用循环的方式或我读取信息的方式都有问题。输出数组中没有存储任何内容。我在代码中评论了我的问题。有人可以帮忙吗?谢谢!
Scanner c = new Scanner (System.in);
while (c.hasNextLine()){
ArrayList <Integer> record= new ArrayList <Integer> (); // next time the while loop runs, I expect the list record to be initialized again
String numbers = c.nextLine();
int n = Integer.parseInt(numbers);
for (int i=0; i<n; i++){
String info = c.nextLine();//then read the following n lines use for loop
int length = info.length(); //get the length of each line
record.add(length);
}
putRecordinArray(record);//some other function to process each record(a block of several lines processed each time by the while loop)
}
//here I tried to print out the array A generated by other function, but nothing was stored.
}
答案 0 :(得分:0)
您的Arraylist名称为records
,但您使用record
records without the 's'
来呼叫它。你have to add the 's'
。
你的一个调用语句的例子。
record.add(length);
更改为:
records.add(length);
也:
putRecordinArray(record);
更改为:
putRecordinArray(records);
希望这有帮助。