title: How to concat two strings in 1 object without creating new object in 'String' class without using '+' or any inbuilt function
body: <p>If I want to add two strings</p>
  
  <pre><code>String s1 = "abc";
  String s2 = "pqr";
  </code></pre>
  
  <p>Here, If I used,</p>
  
  <p><code>s1.concat(s2);</code> </p>
  
  <p>or simple add with + like </p>
  
  <pre><code>s1+s2;
  </code></pre>
  
  <p>Automatically String will create new object and stores the result due to its immutability, So how I can proceed with it without letting String to create new object.</p>