title: Lambda function in Java 8 with no parameter and returning value
body: <p>I want to convert a simple Java function to a lambda 8 function without any parameter, and then call it:</p>
  
  <pre><code>public int getMissing() {
    return 0;
  }
  </code></pre>
  
  <p>how to convert above to java8 lambda format?</p>