Re: [問題] 讀入字串判斷是否為數字的問題
※ 引述《divaka (豬肉腳)》之銘言：
: 大家好，小弟目前已經可以成功讀入字串並且判斷是否為數字，部份的 code 如下
try catch有其意義，處理Exception除了直接catch以外，
還有另外一個方式叫做預先檢測。（也就是你原本所用的方式）
try
{
BufferedReader input = new BufferedReader(new InputStreamReader(
System.in));
System.out.println("請輸入數字：");
String inputStr = input.readLine();
while (inputStr == null || !inputStr.matches("[0-9]+"))
{
System.out.println("輸入錯誤，請重新輸入數字：");
inputStr = input.readLine();
}
int num=Integer.parseInt(inputStr);
System.out.println("輸入的數字是："+num);
}
catch (IOException e) //for readLine()
{
e.printStackTrace();
}
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