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  1. import java.util.*;
  2. import java.lang.*;
  3.  
  4. class Main
  5. {
  6. 	public static void main (String[] args) throws java.lang.Exception
  7. 	{
  8.         String[] test = new String[8];
  9.  
  10.         test[0] = "1234";                            // int
  11.         test[1] = "1234.56";                         // float
  12.         test[2] = "1234.56.78";                      // NaN
  13.         test[3] = "abc";                             // NaN
  14.         test[4] = String.valueOf(Integer.MAX_VALUE); // Max int
  15.         test[5] = String.valueOf(Float.MAX_VALUE);   // Max float
  16.         test[6] = String.valueOf(Integer.MIN_VALUE); // Min int
  17.         test[7] = String.valueOf(Float.MIN_VALUE);   // Min float
  18.  
  19.  
  20.         for (int i=0;i<test.length;i++)
  21.            System.out.println(test[i] + String.format("%"+(20-test[i].length()) +"s","") + 
  22.                               " IS" + (isFloat(test[i])?"    ":" NOT") + " a valid Integer or Float");
  23.  
  24. 	}
  25.  
  26.     public static boolean isFloat(String number){
  27.         try {
  28.             return !new Float(number).isNaN();
  29.         } catch (NumberFormatException e){
  30.             return false;
  31.         }
  32.     }
  33.  
  34. }
Success #stdin #stdout 0.07s 380224KB
comments (?)
stdin 
Standard input is empty
stdout 
1234                 IS     a valid Integer or Float
1234.56              IS     a valid Integer or Float
1234.56.78           IS NOT a valid Integer or Float
abc                  IS NOT a valid Integer or Float
2147483647           IS     a valid Integer or Float
3.4028235E38         IS     a valid Integer or Float
-2147483648          IS     a valid Integer or Float
1.4E-45              IS     a valid Integer or Float
https://ideone.com/UpGPsK
language:
Java (HotSpot 12)
created:
12 years ago
visibility:
public

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