Scanner sc = new Scanner(System.in);
String s = sc.nextLine();

new BigInteger(s);
new BigDecimal(s);

哪个try成功了就是输入哪个类型

Scanner sc = new Scanner(System.in);
String s = sc.nextLine();

new BigInteger(s);
new BigDecimal(s);

哪个try成功了就是输入哪个类型