[JAVA] Use of declaring method abstract in a interface

[temp temp]

What is the advantage of declaring method abstract  in a intreface ?
  for example
  difference between 
  Intreface Test 
  {
      public void  test();
  }
  
  and 
  
  Intreface Test 
    {
        public abstract void  test();
    }
  
  Thanks & Regards
  Sairam
  
  
 
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