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The offset of the first element of the buffer inside the buffer array is obtained using the method arrayOffset() in the class java.nio.DoubleBuffer. If the buffer backed by the array is read-only, then the ReadOnlyBufferException is thrown.A program that demonstrates this is given as follows −Example Live Demoimport java.nio.*; import java.util.*; public class Demo { public static void main(String[] args) { int n = 5; try { DoubleBuffer buffer = DoubleBuffer.allocate(5); buffer.put(4.5D); buffer.put(1.2D); buffer.put(3.9D); ... Read More
The last three clock cycles in the OUT 25H instruction is an example for IOW machine cycle. Waveforms for IOW machine cycle are shown in the figure below: The point to be noted that in an IOW machine cycle, Wand Z registers have identical 8-bit port address. There is also a definite advantage because of address duplication on the addresses ranging from A15-8 and AD7-0 when we are using 8755 (2K × 8 EPROM and two 8-bit ports) and 8155 which is a combination of 256 × 8 RAM, 3 Input Output ports, and 14-bit timer. We can form a 8085-based ... Read More
Fast Fourier transform (FFT) is an algorithm to compute the discrete Fourier transform (DFT) and its inverse. Basically Fourier analysis converts time (or space) to frequency and vice versa. A FFT rapidly computes transformations by factorizing the DFT matrix into a product of sparse (mostly zero) factors.AlgorithmBegin Declare the size of the array Take the elements of the array Declare three arrays Initialize height =size of array and width=size of array Create two outer loops to iterate on output data Create two outer loops to iterate on input data Compute real, img and ... Read More
You can select most recent date out of a set of several possible timestamps with the help of ORDER BY clause.The syntax is as followsSELECT yourColumnName1, yourColumnName2, ...N FROM yourTableName ORDER BY yourTimestampColumnName DESC LIMIT 1;To understand the above syntax, let us create a table. The query to create a table is as followsmysql> create table MostRecentDateDemo - > ( - > Id int NOT NULL AUTO_INCREMENT PRIMARY KEY, - > Name varchar(10), - > ShippingDate timestamp - > ); Query OK, 0 rows affected (0.65 sec)Insert some records in the table using insert command. ... Read More
The escape syntax gives you the flexibility to use database specific features unavailable to you by using standard JDBC methods and properties.The general SQL escape syntax format is as follow:{keyword 'parameters'}Following are various escape syntaxes in JDBC:d, t, ts Keywords: They help identify date, time, and timestamp literals. As you know, no two DBMSs represent time and date the same way. This escape syntax tells the driver to render the date or time in the target database's format{d 'yyyy-mm-dd'}Where yyyy = year, mm = month; dd = date. Using this syntax {d '2009-09-03'} is March 9, 2009.Example//Create a Statement object ... Read More
A ResultSet interface in JDBC represents the tabular data generated by SQL queries. It has a cursor which points to the current row. Initially, this cursor is positioned before the first row.You can retrieve the column value at the current row using the getter methods getInt(), getString(), getDate() etc…To move the cursor and to navigate/iterate through the ResultSet the java.sql.ResultSet interface provides various methods such as next(), Previous(), first(), last(), relative(), absolute(), beforeFirst(), afterLast() etc...Type_FORWARD_ONLY Only ResultSetIn forward only ResultSet you can move the cursor only in forward direction. By default, a ResultSet is of type forward only.Read More
An immutable copy of a LocalDateTime object where some nanoseconds are added to it can be obtained using the plusNanos() method in the LocalDateTime class in Java. This method requires a single parameter i.e. the number of nanoseconds to be added and it returns the LocalDateTime object with the added nanoseconds.A program that demonstrates this is given as follows −Example Live Demoimport java.time.*; public class Demo { public static void main(String[] args) { LocalDateTime ldt = LocalDateTime.now(); System.out.println("The current LocalDateTime is: " + ldt); System.out.println("The LocalDateTime with 1000 nanoseconds added is: ... Read More
The listIterator() method of the CopyOnWriteArrayList class in Java is used to return a list iterator over the elements in this list.The syntax is as followspublic ListIterator listIterator()To work with CopyOnWriteArrayList class, you need to import the following packageimport java.util.concurrent.CopyOnWriteArrayList;The following is an example to implement CopyOnWriteArrayList class listIterator() method in JavaExample Live Demoimport java.util.Iterator; import java.util.concurrent.CopyOnWriteArrayList; public class Demo { public static void main(String[] args) { CopyOnWriteArrayList arrList = new CopyOnWriteArrayList(); arrList.add(30); arrList.add(40); arrList.add(60); arrList.add(70); arrList.add(90); arrList.add(100); ... Read More
Use the delete command to delete blank rows in MySQL.The syntax is as followsdelete from yourTableName where yourColumnName=' ' OR yourColumnName IS NULL;The above syntax will delete blank rows as well as NULL row.To understand the concept, let us create a table.The query to create a table is as followsmysql> create table deleteRowDemo -> ( -> Id int NOT NULL AUTO_INCREMENT PRIMARY KEY, -> StudentName varchar(20) -> ); Query OK, 0 rows affected (0.57 sec)Insert some records in the table using insert command.The query is as followsmysql> insert into deleteRowDemo(StudentName) values('John'); Query OK, 1 row affected ... Read More
To remove NULL records in a column, you can use delete command. Following is the syntax −delete from yourTableName where yourColumnName IS NULL;Let us first create a table −mysql> create table removeNullRecordsDemo -> ( -> Name varchar(100) -> ); Query OK, 0 rows affected (0.50 sec)Following is the query to insert records in the table using insert command −mysql> insert into removeNullRecordsDemo values('John'); Query OK, 1 row affected (0.14 sec) mysql> insert into removeNullRecordsDemo values(null); Query OK, 1 row affected (0.15 sec) mysql> insert into removeNullRecordsDemo values('Larry'); Query OK, 1 row affected (0.19 sec) ... Read More