Question

How can I check that if a string only make from specific character?
For example, I want to check if a string only make from ICDM characters. It pass the test if it makes from ICMD. It fail the test if it makes from any special character like @#$& or lower case.
Example inputs:
if string = CIM, it passed
if string = AIM, it failed
if string = MCDI, it passed
if string = ICDF, it failed

This can be in either java or php language. Any help with detail is appreciated. Thank you!

Answer 1

public class StringTest {
   public static void main(String[] args) {
       String arr[] = { "CIM", "AIM", "MCDI", "ICDF" };
       String str="ICDM";
       boolean passed=true;
       // iterating the each word
       for(String s:arr ){
           passed=true;
           //iterating the each char in the wor
           for(int i=0;i<s.length();i++){
               //checking if is exist in the original word
               if(!str.contains(s.charAt(i)+"")){
                   passed=false;
                   break;
               }
           }
           System.out.print(s+" : ");
           if(passed)
               System.out.println("Passed");
           else
               System.out.println("Failed");
       }
   }
}