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Basic Java Help - Comparing Chars?!

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Why wouldn't this work?!?!! It says.. charAt(int) in java.lang.String cannot be applied to (i) Why?
public void speakTurtle(String actions)
     for (int i=0; i<actions.length()); i++)
        if (actions.charAt(i)=='F')//Gives me error at i here..
            System.out.println ("Works!");

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