title: Copy object to another object java
body: <p>I have an object A that contains for example:</p>
  
  <pre><code>class A{
      String elem1;
      Int elem2;
      ...get and set 
  }
  </code></pre>
  
  <p>and i have a class B that contains same element and name of field:</p>
  
  <pre><code>class B{
      String elem1;
      Int elem2;
      ...get and set 
  }
  </code></pre>
  
  <p>i want copy class A value into class B value without modify the class. 
  How can solve? thanks.</p>