1. Identify the false statement.

   1. System.in refers to the standard input device, which normally is the keyboard.

   2. When a user types data followed by the Enter key, the Enter key character is left in the keyboard buffer after Scanner class methods retrieve the other keystrokes.

   3. System.in is more flexible than System.out because it can read all the basic Java data types.

2. Identify the false statement.

   1. You can create an input dialog box using the showInputDialog() method; the method returns a String that represents a user's response.

   2. A confirm dialog box can be created using the showConfirmDialog() method in the JOptionPane class; a confirm dialog box displays the options Accept, Reject, and Escape.

   3. You can use methods from the Java classes Integer and Double when you want to convert a dialog box's returned values to numbers.

3. Identify the false statement.

   1. The arithmetic operators are examples of unary operators, which are so named because they perform one operation at a time.

   2. In Java, operator precedence dictates that multiplication, division, and remainder always take place prior to addition or subtraction in an expression.

   3. Floating-point arithmetic might produce imprecise results.

4. Identify the false statement.

   1. Summing a double, int, and float results in a double.

   2. You can explicitly override the unifying type imposed by Java by performing a type cast; type casting forces a value of one data type to be used as a value of another type.

   3. When you perform arithmetic operations with operands of unlike types, you must make an explicit conversion to a unifying type.