title: java 8 List<Pair<String, Integer>> to List<String>
body: <p>There is a List>:</p>
  
  <pre><code>List&lt;Pair&lt;String, Integer&gt;&gt; list =new ArrayList&lt;&gt;();
  </code></pre>
  
  <p>Pair is <code>javafx.util.Pair</code> which has a key and a value.
  and a </p>
  
  <pre><code>Integer tmp;
  </code></pre>
  
  <p>how should I get all String which <code>Pair.getValue() &gt;=tmp</code>  by java 8 stream? </p>