1. Describe how the scanner class works with the system. in object in order to provide flexibility. Provide an example of using the Scanner class with System.in. 2. Describe three ways in which a named constant differs from a variable. 3. How could you alter the following statement to display "Welcome" on one line and "back" on another line? Show two possible solutions. System.out println ("Welcome back"); 4. A variable declaration is a statement that reserves a named memory location. It includes what four elements? 5. Describe and give an example of operator precedence. 6. Explain how you can override a unifying type imposed by Java. Show an example. 7. Describe how the use of named constants can provide advantages over the use of literal values