Which of these coding types is used for data type characters in Java?

Which of these coding types is used for data type characters in Java?

2) What is the base of BigDecimal data type?

3) What is the output of below code snippet?

   enum Levels
  {
     private TOP,
       public MEDIUM,
       protected BOTTOM;
 }

4) What is the range of short data type in Java?

5) Which of these literals can be contained in float data type variable?