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end of ch 2 (Using Dialog Boxes for Input and Output (alternative: Call…

- - - - this returns a sring obj
        
        if you need a num, then use -Integer.parseInt and Double.parseDouble methods to convert the string to a number:
        
        double price = Double.parseDouble(input);
- - - - Belongs to String class
        
        can use .substring( , ); method
    - - Belongs to Scanner class
        
        can use in.nextDouble(); method
    - - Belongs to PrintStream class
        
        can use System.out.print(" "); method
- - - - instance
        
        methods that are invoked on objects
      - static
        
        methods that are not invoked on objects
        
        Math.sqrt(num);