如何限制在java中运行时从用户获取的整数值？ [英] How to limit integer values obtained from user at the runtime in java ?

问题描述

I wanted to get the mobile number from the user in java using scanner. When the user enters the number, he/she shouldn't be able to enter when the limit exceeds 10. Could anyone share how ?

我尝试过的事情：

What I have tried:

long mobNo;
     Scanner s=new Scanner(System.in);
     mobNo=s.nextLong();
      int length = (int)(Math.log10(mobNo)+1);
     if(length==10)
         System.out.println("Successfully entered !");
     else
         System.out.println("Enter only 10 digits");

推荐答案

正则表达式 - 根据本地化格式有许多可用模式

Regular Expressions- there are many available patterns depending on localized formats

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