title: make new thread for send mail Id in java
body: <p>I am working in online application, in which there is facility of creating group. I want facility to send mail to all group user when any activity done in group. like comments , start new discussion etc. But problem is that . if any small activity i send thorusand of mail at run time. it slow the performance. </p>
  
  <p>For that i am thinking to create new independent thread. to send mail which send mail to thousand of user and main thead with out any problem come to group page. </p>
  
  <p>How i will make new thread in class. 
  thanks in advances.</p>
  
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