title: When to use MutableLiveData and LiveData
body: <p>when to use <code>MutableLiveData</code> and <code>LiveData</code> means the area of using the methods :</p>
  
  <pre><code>MutableLiveData&lt;User&gt; getUser() {
      if (userMutableLiveData == null) {
          userMutableLiveData = new MutableLiveData&lt;&gt;();
      }
      return userMutableLiveData;
  }
  </code></pre>
  
  <p>and when to use this,</p>
  
  <pre><code>LiveData&lt;User&gt; getUser() {
      if (userMutableLiveData == null) {
          userMutableLiveData = new MutableLiveData&lt;&gt;();
      }
      return userMutableLiveData
  }
  </code></pre>