title: How to Reassign value of StringBuffer?
body: <p>How can we re assign the value of a StringBuffer or StringBuilder Variable?</p>
  
  <pre><code>StringBuffer sb=new StringBuffer("teststr");
  </code></pre>
  
  <p>Now i have to change the value of sb to "testString" without emptying the contents.
  I am looking at a method which can do this assignment directly without using separate memory allocation.I think we can do it only after emptying the contents.</p>