prompt = new Label("Enter integer and press Enter:"); 

• creates a Label object, initializing the string literal to "Enter integer and press Enter:"
• The idea is to label the text field so that the user will know what to do: type in an integer and press the Enter key.
• We named it "prompt" because our intention is to prompt the user to act (in accordance with our wishes).
• The word new is an operator that requests enough memory from the Java runtime system to store a Label object;

  Label("Enter integer and press Enter:") 

• after the new operator, is used to construct our desired value for the Label object.
• It is called a constructor for Label objects. We learn more about constructors later.
• The = operator is an assignment operator: the value on its right is assigned to the name on its left: prompt (a name that we declared would refer to an object of type Label).