java find letter in string code example

Example 1: java find all of letter in string

String stringName = "Hello";
String characterToFind = "l";
//This example will find all the Ls in this string and will print the index of
//it as soon as it is detected

for(int i = 0; i < stringName.length(); i++){
  if(stringName.substring(i, i+1).equals(characterToFind)){
    System.out.println(characterToFind + "found at " + i);
  }
  
}

Example 2: how to search for charecters in java

public class Test {
   public static void main(String args[]) {
      String str = new String("I81753490B9C/DQC");
      int index = str.indexOf('DQC');
      System.out.println("Index of the letter w :: "+index);
   }
}