readdouble.java

来自「Java程序」· Java 代码 · 共 24 行

package Mypackage;
import  java.io.* ;
public class ReadDouble
{  public static double read()
   {System.out.println("请输入一个数字");
    String a=input();
   	try
    {return Double.parseDouble(a);}
    catch(NumberFormatException e)
    {System.out.println("输入错误，请重新输入");
     double bb=read();
     return bb;}
   }
   public static String input()
    {String strinfo=null;
       try
      {BufferedReader  br =new BufferedReader(new InputStreamReader(System.in));
       strinfo=br.readLine();}
       catch (IOException  e)
      {System.out.println("caught IOException");}
      return strinfo;
    }
  
 }