title: second parameter in preferences.getInt in android
body: <pre><code>int minMagIndex = prefs.getInt(Preferences.PREF_MIN_MAG, 0);
  if (minMagIndex &lt; 0)
  minMagIndex = 0;
  int freqIndex = prefs.getInt(Preferences.PREF_UPDATE_FREQ, 0);
  if (freqIndex &lt; 0)
  freqIndex = 0;
  </code></pre>
  
  <p>What is the second parameter in prefs.getInt ?</p>
  
  <p>why is this if condition check done ?</p>