JAVA 中两种判断输入的是否是数字的方法
package t0806; import java.io.*; import java.util.regex.*; public class zhengzehua_test { /** * @param args */ public static void main(String[] args) { // TODO Auto-generated method stub try { System.out.println("请输入第一个数字:"); BufferedReader reader = new BufferedReader(new InputStreamReader(System.in)); String num1 = reader.readLine(); while(!num1.matches("\d+")) { System.out.println("输入的不是数字,请重新输入"); num1 = reader.readLine(); } System.out.println("请输入第二个数字:"); String num2 = reader.readLine(); while(!Pattern.compile("[0-9]*").matcher(num2).matches()) { System.out.println("输入的不是数字,请重新输入"); num2 = reader.readLine(); } int result = Integer.parseInt(num1) * Integer.parseInt(num2); System.out.println("乘积是:"+ result); } catch (IOException e) { // TODO Auto-generated catch block e.printStackTrace(); } } }