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Java programs are simple text-based programs and can be edited using any text editor like notepad etc. The filename should be same as class name.
To check this we need to have the profiling information which indicates resource usage for the statements executed during the course of the current session. Profiling information can get by SHOW PROFILE and SHOW PROFILES statement. Before running these statements, the profiling session variable must be set to 1 as follows − mysql> set profiling = 1; Query OK, 0 rows affected (0.00 sec) Now if we will run SHOW PROFILES statement then it will display the list of most recent statements sent to the server along with the duration and query id. mysql> show profiles; +----------+------------+--------------------------------------+ ... Read More
Object slicing is used to describe the situation when you assign an object of a derived class to an instance of a base class. This causes a loss of methods and member variables for the derived class object. This is termed as information being sliced away. For example, class Foo { int a; }; class Bar : public Foo { int b; }; Since Bar extends Foo, it now has 2 member variables, a and b. So if you create a variable bar of type Bar and then create ... Read More
& is a bitwise operator and compares each operand bitwise.It is a binary AND Operator and copies a bit to the result if it exists in both operands.Assume integer variable A holds 60 and variable B holds 13 then (A & B) will give 12 which is 0000 1100.Whereas && is a logical AND operator and operates on boolean operands. If both the operands are true, then the condition becomes true otherwise it is false. Assume boolean variable A holds true and variable B holds false then (A && B) is false.& is to be used during bitwise operations and && is useful during logical operations.
| is a bitwise operator and compares each operands bitwise.It is a binary OR Operator and copies a bit to the result it exists in either operands.Assume integer variable A holds 60 and variable B holds 13 then (A | B) will give 61 which is 0011 1101.Whereas || is a logical OR operator and operates on boolean operands. If both the operands are false, then the condition becomes false otherwise it is true. Assume boolean variable A holds true and variable B holds false then (A && B) is true.| is to be used during bitwise operations and || is useful during logical operations.
Undefined behavior is simply behavior that is not defined by the C++ specification. For example, if you have multiple unary increment/decrement operations in an expression like i++ + ++i, they result in behavior that is not defined. This is simply due to the fact that some language constructs are syntactically valid but you can't predict the behavior when the code is run. Another example is the expression: u = (u++);Implementation-defined behavior is behavior unspecified by the specification and left for the implementor to decide and document how the choice is made. In this case, the choice that is made must ... Read More
The ctrlKey property is used to show whether the CTRL key is pressed or not when key event was triggered. You can try to run the following code to learn how to implement a ctrlKey property in JavaScript − Example Live Demo Press any key function funcCtrlKey(event) { var val = document.getElementById("res"); if (event.ctrlKey) { val.innerHTML = "CTRL key: Pressed"; } else { val.innerHTML = "CTRL key: NOT Pressed"; } }
The hashCode(Object[]) method of the java.util.Arrays class returns a hash code based on the contents of the specified array. If the array contains other arrays of elements, the hash code is based on their identities rather than their contents. For any two arrays a and b such that Arrays.equals(a, b), it is also the case that Arrays.hashCode(a) == Arrays.hashCode(b). Example import java.util.Arrays; public class ArrayDemo { public static void main(String[] args) { Object[] ob = new Object[] { 22, 7 }; ... Read More
On client and server, the following storages are available: local storage, session storage, and cookies.The Local Storage is designed for storage that spans multiple windows and lasts beyond the current session. In particular, Web applications may wish to store megabytes of user data, such as entire user-authored documents or a user's mailbox, on the client side for performance reasons. Cookies do not handle this case well because they are transmitted with every request.Local Storage is available for every page and remains even when the web browser is closed, but you cannot read it on the server.The stored data has no ... Read More
MySQL ADDTIME() function can be used to add a time interval in the data stored in a column of the table. The syntax of this function is ADDTIME(date, ‘expression unit’). It can be demonstrated by following the example which uses the data from table ‘collegedetail’. mysql> Select estb, ADDTIME(estb, '05:04:25')AS 'Date with time' From collegedetail WHERE ID = 111; +------------+---------------------+ | estb | Date with time | +------------+---------------------+ | 2010-05-01 | 2010-05-01 05:04:25 | +------------+---------------------+ 1 row in set (0.02 sec) Here, ‘estb’ is a column of table ‘collegedetail’ having the date as values.