title: Java - Adding another String value to existing HashMap Key without overwriting?
body: <p>I was wondering if someone would be able to help with regards to adding another <code>String</code> value to an existing key within a <code>HashMap</code> in Java?</p>
  
  <p>I understand that you can add a Key-Value pair using the <code>this.put("String", "String")</code> method. However, it overwrites the existing value, whereas I would like multiple values stored and paired, with the same key?</p>
  
  <p>Thanks for your help.</p>