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  1. /* package whatever; // don't place package name! */
  2.  
  3. import java.util.*;
  4. import java.lang.*;
  5. import java.io.*;
  6.  
  7. /* Name of the class has to be "Main" only if the class is public. */
  8. class Ideone
  9. {
  10. 	public static void main(String[] args) {
  11.         Scanner scanInst = new Scanner(System.in);
  12.         System.out.println("Введите число: ");
  13.         String cmd;
  14.         while (true) {
  15.             cmd = scanInst.nextLine();
  16.             System.out.println("Вы ввели: " + cmd);
  17.             if (cmd.equals("exit")) {
  18.                 return;
  19.             } else {
  20.                 // Проверка на то, является ли число типом double
  21.                 try { Double.parseDouble(cmd);}
  22.                 catch(NumberFormatException e)
  23.                 {
  24.                     System.out.println("Тип данных должен быть с плавающей точкой");
  25.                 }
  26.             }
  27.         }
  28.     }
  29. }
Runtime error #stdin #stdout #stderr 0.12s 51712KB
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stdin
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Standard input is empty
stdout
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Введите число:
stderr
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Exception in thread "main" java.util.NoSuchElementException: No line found
	at java.base/java.util.Scanner.nextLine(Scanner.java:1651)
	at Ideone.main(Main.java:15)
https://ideone.com/zVz1wa
language:
Java (HotSpot 12)
created:
4 years ago
visibility:
public

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