What is the purpose of Java dot operator

Question

Can anybody give me an easy explanation of the Java dot operator and its significance?

Answer 1

The (.) operator is also called a member operator which is used to access the member of a package or a class. 

Example: 

public class test { 

   void display() { 

      double d = 89.3; 

      int i = (int)d; 

      System.out.println(i); 

   } 

   public static void main(String args[]) { 

      Sample s = new Sample(); 

      s.display(); 

   } 

}