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anygoal [31]
3 years ago
11

What occurs when you call a method on a reference variable that contains null? Select one: a. An ArrayIndexOutOfBoundsException

error b. An ArithmeticException error c. A NullPointerException error d. A ClassCastException error
Computers and Technology
1 answer:
Finger [1]3 years ago
5 0

Answer:

Option(c) i.e "A NullPointerException error " is the correct answer for the given question.

Explanation:

Exception are the run time error in the program.A NullPointerException is the runtime error when the pointer containing the NULL value .This type of exception occur when we call that function on the pointer variable which contains the NULL.

  • ArrayIndexOutOfBoundsException error occur when we accessing the element which is out of the index or bound so this option is incorrect.
  • An ArithmeticException error  occur in the arithmetic operation. Suppose a number is divided by zero then the ArithmeticException error is occured .
  • ClassCastException error occur in the typecasting of a specific object.So this option is incorrect.
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Problems and Exercises 16 through 43 are based on the entire ("big" version) Pine Valley Furniture Company database. Note: Depen
lesya [120]

Answer:

SQL queries

The command used to display the customer ID and total number of orders placed is given below

Query:

SELECT CustomerID, COUNT (orderID) AS TotalOrders

FROM Order_Table

GROUP BY CustomerID

Explanation:

SQL queries

The command used to display the customer ID and total number of orders placed is given below

Query:

SELECT CustomerID, COUNT (orderID) AS TotalOrders

FROM Order_Table

GROUP BY CustomerID

SELECT - To query the database and get back the specified fields SQL uses the select statement

CustomerID is a coloumn name

The function COUNT(OrderID) returns the number of orders

Totalorderds is a label

FROM - To query the database and get back the preferred information by specifying the table name

Order_Table is a table name

GROUP BY - The clause is used to group the result of a SELECT statement done on a table where the tuple values are similar for more than one column

The table below displays the CustomerID and total number of orders placed

CustomerID                                              Totalorders

4                                                                    28

1                                                                      6

12                                                                    5

16                                                                    5

6                                                                     3

9                                                                     3

15                                                                    3

3                                                                     1

13                                                                    1

14                                                                    1

The table below shows the total number of orders situated for each sales person

SalesPerson_ID                                         TotalOrders

3                                                                    16

2                                                                     3

4                                                                     3

5                                                                     3

3 0
3 years ago
(03 MC)Why is it important to set goals and share them with others?
Ad libitum [116K]

Answer:

answer is b

Explanation:

hope it was helpful

3 0
3 years ago
A certain computer has a 4meg address space. how many bits wide is this computer's address bus?
PIT_PIT [208]
22 bits






-----------------------------------
4 0
3 years ago
If you are going to develop a special computer, what would it be and explain it's purpose.​
Ann [662]

Answer:

It would be to figure out what cancers someone could exactly so no need for a biopsy

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3 years ago
Switches: Select one:
const2013 [10]

Answer:

b. connect two or more network segments that use different data link protocols

Explanation:

A switch is an analog device that allows to interconnect networks, it is possibly one of the devices with a higher level of scalability. It is important to clarify that a Switch does not only provide connectivity with other networks, nor does it provide connectivity with the Internet, for this purpose a router is necessary.  

6 0
3 years ago
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