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public class Test{ 

   public static void main(String args[]){
      Integer x = 5;
      // Returns the primitive byte data type
      System.out.println( x.byteValue() );

      // Returns the primitive double data type
      System.out.println(x.doubleValue());

      // Returns the primitive long data type
      System.out.println( x.longValue() );      
   }
}

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5.0
5