title: String vs char[]
body: <p>I have some slides from IBM named : <a href="http://www.ibm.com/developerworks/library/j-codetoheap/#N101DC" rel="nofollow noreferrer">"From Java Code to Java Heap: Understanding the Memory Usage of Your Application"</a>,  that says, when we use <code>String</code> instead of <code>char[]</code>, there is </p>
  
  <p><strong>Maximum overhead would be 24:1 for a single character!</strong></p>
  
  <p>but I am not able to understand what overhead is referred here. Can anybody please help?</p>
  
  <p><strong>Source :</strong></p>
  
  <p><img src="https://i.stack.imgur.com/WhEBr.png" alt="enter image description here"></p>