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Use String indexOf to locate a character in a string

public class MainClass {    public static void main( String args[] )    {       String letters = "abcdefghijklmabcdefghijklm";              System.out.printf(           "'c' is located at index %d\n", letters.indexOf( 'c' ) );       System.out.printf(          "'a' is located at index %d\n", letters.indexOf( 'a', 1 ) );       System.out.printf(          "'$' is located at index %d\n\n", letters.indexOf( '$' ) );    } } 'c' is located at index 2 'a' is located at index 13 '$' is located at index -1