title: convert the unicode in a String into char
body: <p>This is a basic question and yet I could not find an exact duplicate on SA:</p>
  
  <p>I have this string:<br></p>
  
  <pre><code>String s = "surname\":\"B\\u00f6rner\"},{\"forename\""
  </code></pre>
  
  <p>What I'd like to get is:<br></p>
  
  <pre><code>String s = "surname\":\"Börner\"},{\"forename\""
  </code></pre>
  
  <p>Any way to do this in Java? Thx!</p>