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Best practice to using if - else logic

jkteater asked
Last Modified: 2012-08-16
In my method I am getting a String value for XMLFormat.  If the value is null or has no value I want to run method a, if the value has a value of version 1, I want to run method a.  but if the value has a value of version 2, I want to run method b.  Please tell me if my logic looks OK?

public void setXMLFormat(){
      TCPreferenceService ups = session.getPreferenceService(); 
      String xmlFormat = ups.getString(TCPreferenceService.TC_preference_user,  XML_FORMAT");    
      if(xmlFormat == null || xmlFormat.trim().isEmpty()) {
      else if(xmlFormat == "version 1") {
      else {

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