Question

how can i i detect the number or special charaters exist in the string

Asked by: tseyeh

How can i check wheather ther is a number or special character exist in the string?

for ex. boolean checkstring(String st)
    {
     
     }
it will return true if no special charaters found in the String st, otherwise return false. The space is also consider to be the special characters.

thanks in advance for those who try to help me , and all the experts in this site

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Asked On
1999-08-08 at 06:27:16ID10191993
Tags

special

,

detect

,

character

,

charaters

Topic

Java Programming Language

Participating Experts
1
Points
50
Comments
1

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Answers

 

by: prainPosted on 1999-08-08 at 08:21:42ID: 1247876

There is no straight method in the String class to do the operation you want. Here is a program that will do what you want. In the method isStringContainsSpecialCharacter() below, you may insert the set of special characters you like. I have made a special character string for testing purposes. you may change it to fit into your requirements.

import java.io.*;

public class CheckIfSpecial
{
 public static void main(String args[])
 {
   String testString1 = "HJHJHJHHKwuw897131048ujdlj3802456" ;
   String testString2 = "dsklasd%klasjdlasd";
 
   System.out.println("Test 1");
   if(isStringContainsSpecialCharacter(testString1))
     System.out.println("String " + testString1 + " is a string with " +
                          "special characters");
   else
    System.out.println("String " + testString1 + " has no special characters.");  

   System.out.println("Test 2");
   if(isStringContainsSpecialCharacter(testString2))
     System.out.println("String " + testString2 + " is a string with " +
                          "special characters");
   else
    System.out.println("String " + testString2 + " has no special characters.");  
 }

 public static boolean isStringContainsSpecialCharacter(String inStr)
 {
  String SpecialCharacters = "$#@%^& !*()?><_-+=~`";
  int innerLength = SpecialCharacters.length();
 
  int length = inStr.length();

  for (int index = 0; index < length ; index++)
   {
     for (int innerIndex = 0; innerIndex < innerLength; innerIndex++)
     {
       if (inStr.charAt(index) == SpecialCharacters.charAt(innerIndex))
        return true;
     }
   }
  return false;
 }
}

20120131-EE-VQP-002

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