java methods joined by a dot -

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I am thinking of joining a dot in Java in two ways, for example the following code: 

  string driver class = getServletContext (). GetInitParameter ("driverClass"); Anyone can tell what this line means:  
  getServletContext (). GetInitParameter ("driverClass");   
 The two ways are connected to the dot, why? Simple answer: This is called chaining, the first method gives an object and it is returned (object) on it. The second method is called. We save a line to specify it in a variable.

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