java怎么输入整数

Integer

如果是想通过键盘，输入整数，可以这么写： public class TestInput { public static void main(String[] args) { try { BufferedReader br = new BufferedReader(new InputStreamReader(System.in)); System.out.println("please Input an integer"); Long inputNumber = Long.valueOf(br.readLine()); System.out.println("you input: 123" + inputNumber); }catch (Exception e){ System.out.println("invalid input!"); } } }