title: how to use class files inside a jar file?
body: <p>I'm using <strong>eclipse</strong>, the jar files locate in ~/zmx/alg4/algs4.jar, the class file I need is algs4.jar/A.class. my project exists in ~/workspace/test. the jar file are already in <strong>Referenced Libraries</strong>, how can I use the class file in my project? I've already tried:</p>
  
  <pre><code>import A; 
  private A variable = new A();
  </code></pre>
  
  <p>but it doesn't work.</p>