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Programming Articles
Page 2510 of 2547
Java Program to convert a list to a read-only list
Let’s say the following is our list which isn’t read-only:List < Integer > list = new ArrayList < Integer > (); list.add(10); list.add(20); list.add(30); list.add(40); list.add(50); list.add(20); list.add(40); list.add(50);Convert the above list to Read-only:list = Collections.unmodifiableList(list);On conversion, now you won’t be add or remove elements from the List. Let us see an example:The following program will give an error because we first update the list to read only and then try to remove an element from it, which is not possible now. The reason is we have converted the list to readonly and you cannot add or remove element from ...
Read MoreWhat is ODBC?
ODBC stands for Oracle Database Connectivity. It is an API which is used to access different databases.The OFBC driver uses the Open Database connectivity interface provided by Microsoft to communicate with the databases. It is independent of Databases and platforms and operating systems. Once you develop an application using ODBC you can run it on other platforms with little change in Data access code. ODBC uses SQL syntax and it is based on Open call level interface.
Read MoreJava Program to check for the supported attribute via java.nio.file.FileStore
Following is our file:Path p = Paths.get("E:/input.txt"); FileStore file = Files.getFileStore(p);Now, check for the supported attributes one by one:FileAttributeView = file.supportsFileAttributeView(FileAttributeView.class) PosixFileAttributeView = file.supportsFileAttributeView(PosixFileAttributeView.class) BasicFileAttributeView = file.supportsFileAttributeView(BasicFileAttributeView.class)Exampleimport java.nio.file.FileStore; import java.nio.file.Files; import java.nio.file.Path; import java.nio.file.Paths; import java.nio.file.attribute.BasicFileAttributeView; import java.nio.file.attribute.FileAttributeView; import java.nio.file.attribute.FileOwnerAttributeView; import java.nio.file.attribute.PosixFileAttributeView; public class Demo { public static void main(String[] args) throws Exception { Path p = Paths.get("E:/input.txt"); FileStore file = Files.getFileStore(p); System.out.println("FileAttributeView = " + file.supportsFileAttributeView(FileAttributeView.class)); System.out.println("PosixFileAttributeView = "+ file.supportsFileAttributeView(PosixFileAttributeView.class)); System.out.println("BasicFileAttributeView = "+ file.supportsFileAttributeView(BasicFileAttributeView.class)); System.out.println("FileOwnerAttributeView supported = "+ file.supportsFileAttributeView(FileOwnerAttributeView.class)); ...
Read MoreJava Program to format date as Apr 19, 2019, 1:27 PM
To format and display datetime, you need to use DateTimeFormatter. The format style is MEDIUM and SHORT:DateTimeFormatter formatter = DateTimeFormatter .ofLocalizedDateTime(FormatStyle.MEDIUM, FormatStyle.SHORT);Display the formatted date:formatter.format(LocalDateTime.now()Exampleimport java.time.LocalDateTime; import java.time.format.DateTimeFormatter; import java.time.format.FormatStyle; public class Demo { public static void main(String[] args) { DateTimeFormatter formatter = DateTimeFormatter .ofLocalizedDateTime(FormatStyle.MEDIUM, FormatStyle.SHORT); System.out.println("Formatted Date = "+formatter.format(LocalDateTime.now())); } }OutputFormatted Date = Apr 19, 2019, 1:27 PM
Read MoreWhat is ResultSet Concurrency in JDBC?
The concurrency of the ResultSet object determines whether its contents can be updated or not.The Connection interface provides 3 variants of the createStatement() method where one of the method's signature is as follows:Statement createStatement(int resultSetType, int resultSetConcurrency)This method accepts two integer type variables where one represents the type of the ResultSet and the other represents the Concurrency of the ResultSet.The ResultSet interface provides two values to specify the concurrency of the ResultSet.CONCUR_READ_ONLY: If you set this as a value of the concurrency while creating the ResultSet object you cannot update the contents of the ResultSet you can only read/retrieve them.CONCUR_UPDATABLE: ...
Read MoreWhat are the features of ODBC?
ODBC drivers implements standard SQL syntax, following are the important features of ODBC:Inter-operability: Using ODBC driver you can develop applications which can communicate with different Database Management Systems and, you can switch/migrate your application from one database to other easily.SQL Syntax: ODBC implements SQL syntax for easy understanding. Whenever an SQL statement passed to the ODBC driver it matches the given statement to the SQL 92 standard and writes the respective SQL statement that is accepted by an underlying database.Rich metadata: ODBC provides rich support to metadata. It provides functions to get data about both functions and datatypes.Attributes: ODBC also ...
Read MoreJava Program to format LocalDateTime as ISO_WEEK_DATE format
At first, set the date:LocalDateTime dateTime = LocalDateTime.of(2019, Month.SEPTEMBER, 9, 10, 20);Now, format the datetime as ISO_WEEK_DATE format:String str = dateTime.format(DateTimeFormatter.ISO_WEEK_DATE);Exampleimport java.time.LocalDateTime; import java.time.Month; import java.time.format.DateTimeFormatter; public class Demo { public static void main(String[] args) { LocalDateTime dateTime = LocalDateTime.of(2019, Month.SEPTEMBER, 9, 10, 20); System.out.println("DateTime = "+dateTime); String str = dateTime.format(DateTimeFormatter.ISO_WEEK_DATE); System.out.println("Formatted date = "+str); } }OutputDateTime = 2019-09-09T10:20 Formatted date = 2019-W37-1
Read MoreWhat is CONCUR_READ_ONLY ResultSet in JDBC? Explain?
In general, you will pass this as a value to the createStatement() method as a value of ResultSet Concurrency type.Statement createStatement(int resultSetType, int resultSetConcurrency)This type of result set is not updatable. i.e. once you get a ResultSet object you cannot update its contents.ExampleSuppose, we have a table named Employee in the database with the following contents:+----+---------+--------+----------------+ | Id | Name | Salary | Location | +----+---------+--------+----------------+ | 1 | Amit | 3000 | Hyderabad | | 2 | Kalyan | 4000 | Vishakhapatnam | | 3 | Renuka | 6000 ...
Read MoreJava Program to format LocalTimeDate as BASIC_ISO_DATE format
At first, set the date:LocalDateTime dateTime = LocalDateTime.of(2019, Month.SEPTEMBER, 6, 20, 10);Now, format the datetime as BASIC_ISO_DATE format:String str = dateTime.format(DateTimeFormatter.BASIC_ISO_DATE);Exampleimport java.time.LocalDateTime; import java.time.Month; import java.time.format.DateTimeFormatter; public class Demo { public static void main(String[] args) { LocalDateTime dateTime = LocalDateTime.of(2019, Month.SEPTEMBER, 6, 20, 10); System.out.println("DateTime = "+dateTime); String str = dateTime.format(DateTimeFormatter.BASIC_ISO_DATE); System.out.println("Formatted date = "+str); } }OutputDateTime = 2019-09-06T20:10 Formatted date = 20190906
Read MoreWhat are the important components of ODBC?
Following are the main components of the ODBC architecture.Application: An application which communicates with the databases using ODBC functions is ODBC application.ODBC driver manager: Whenever an application calls a function of ODBC API to communicate with a database, the driver manager accepts and passes it to ODBC driver and accepts the results from the driver and returns it back to the application.ODBC driver: The ODBC driver accepts the application function calls from the driver manager and connects to the specified DataSource, retrieves the required data and returns it to the driver manager.Data source: A DataSource contains a set of data, ...
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