title: Appending arraylist in java
body: <p>Is it possible to concatenate two or more arraylist ? I have following case:</p>
  
  <pre><code> private Arraylist&lt;Double&gt; getContextVectorsize(int sizeContext){
       ArrayList&lt;Double&gt; contextList = new ArrayList&lt;Double&gt;();
       for(int i =0 ; i&lt; sizeContext; i++){
           contextList = //TODO 
       }   
  }
  </code></pre>
  
  <p>I would like to append all the arraylist in order and want to generate an arraylist of 
  <code> size = sizeContext*ArraylistOfSingleMember </code></p>