title: What is mean by a lambda expression in Java?
body: <p>Whenever I write below code in netbeans it will highlight the code with yellow lines and tell to use lambda expression, So what is the use of lambda expression in Java?</p>
  
  <pre><code>.addActionListener(new ActionListener() {
                              @Override
                              public void actionPerformed(ActionEvent evt) {
  }
  }
  </code></pre>