how to find out '<' character which is not a markup tag in xml string using java?

The below xml is converted into a String.I have to find '<' character which is part of xml element actionComent value

<actionTakenTaskCollectionRoot>
  <actionTakenTask actionTakenTaskId="8a8080844cd55b0b014cd5f783ea0692">
    <actionComment>a **<** b</actionComment>
  </actionTakenTask>
</actionTakenTaskCollectionRoot>