Java Buzz Forum - How to check if a character is a special character in java

To check if string contains special character or not or check whether first character is special character or not we can use regex or contains method of sting class.
By using java.util.regex.Matcher class and java.util.regex.Pattern class methods we can check whether string has special character or not
Lets see an example program on how to check a string has special character or not using java regex.

Program #1: Java example program to check string has special character or not using java regex's?

Output:

We can check each character of a string is special character or not without using java regex's.
By using String class contains method and for loop we can check each character of a sting is special character or not.
Let us see a java example program on how to check each character (including space) of a string is special character or not.
String validation for special characters.

Program #2: Java example program to check each character of string is special character or not without using java regex's?

package StringInterviewprograms;
import java.util.regex.Matcher;
import java.util.regex.Pattern;
public class CheckSpecialCharacterString {
/**
* Check whether the each character of String is special character or not using java
* @author www.instanceofjava.com
*/
public static void main(String[] args) {
String Str="Java String interview questions*$%";
String specialCharacters=" !#$%&'()*+,-./:;<=>?@[]^_`{|}";
for (int i = 0; i < Str.length(); i++) {
if (specialCharacters.contains(Character.toString(Str.charAt(i))))
{
System.out.println(Str.charAt(i)+": is a special character");
}
}
}
}

Output:

Program #3: Java example program to check each character of string is special character or not without using java regex's Using Eclipse IDE.


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