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Use the headMap() method in Java to get ahead map. It returns a view of the portion of this map whose keys are less than or equal to.Let’s say you need to get the portion of the map above the set map (and not inclusive of it). For that, use the headMap() method like this −m.headMap(4)If you want the value 4 to be included as well, then set it as true −m.headMap(4, true)The following is an example to get Head Map from Java TreeMap −Example Live Demoimport java.util.*; public class Demo { public static void main(String args[]) { ... Read More
This is a common issue that has been faced by us once or more in our college and school time. The appropriate resolution for this differs as to which university or organization one studies in. Still, the below solutions could help.1. If carrying a mobile phone is allowed in your library, click a picture of the important topics you wished to study from the book you want to get issued.2. You may also get these books issued on the card of any other student. We used to have the books issued through identity cards in our school and college. In ... Read More
The method java.io.File.isDirectory() checks whether a file with the specified abstract path name is a directory or not. This method returns true if the file specified by the abstract path name is a directory and false otherwise.A program that demonstrates this is given as follows −Example Live Demoimport java.io.File; public class Demo { public static void main(String[] args) { try { File file = new File("demo1.txt"); file.createNewFile(); System.out.println("Is directory? " + file.isDirectory()); } catch(Exception e) { e.printStackTrace(); ... Read More
To view stored procedure/function definition in MySQL, you can use show command. The syntax is as follows −SHOW CREATE PROCEDURE yourProcedureName;To understand the above syntax, you can create a procedure and check that definition. Let us create a stored procedure −mysql> delimiter // mysql> create procedure AllRecords() -> begin -> select *from student; -> end // Query OK, 0 rows affected (0.24 sec)You can call the stored procedure with the help of call command. The query is as follows −mysql> delimiter ; mysql> call AllRecords();The following is the output −+------+-------+ | id | Name | +------+-------+ ... Read More
Use the firstKey() method to get the lowest key stored in TreeMap.Let us first set the TreeMap and add some elements to it −TreeMap m = new TreeMap(); m.put(1, "PHP"); m.put(2, "jQuery"); m.put(3, "JavaScript"); m.put(4, "Ruby"); m.put(5, "Java"); m.put(6, "AngularJS"); m.put(7, "ExpressJS");Now get the lowest key −m.firstKey()The following is an example to get the lowest key in TreeMap −Example Live Demoimport java.util.*; public class Demo { public static void main(String args[]) { TreeMap m = new TreeMap(); m.put(1, "PHP"); m.put(2, "jQuery"); m.put(3, "JavaScript"); m.put(4, "Ruby"); ... Read More
The method java.io.File.isFile() is used to check whether the given file specified by the abstract path name is an existing file in Java. This method returns true if the file specified by the abstract path name is a file and false otherwise.A program that demonstrates this is given as follows −Example Live Demoimport java.io.File; public class Demo { public static void main(String[] args) { try { File file = new File("demo1.txt"); file.createNewFile(); System.out.println("Is file? " + file.isFile()); } catch(Exception e) { ... Read More
The method java.io.File.isHidden() is used to check whether the given file specified by the abstract path name is a hidden file in Java. This method returns true if the file specified by the abstract path name is hidden and false otherwise.A program that demonstrates this is given as follows −Example Live Demoimport java.io.File; public class Demo { public static void main(String[] args) { try { File file = new File("demo1.txt"); file.createNewFile(); System.out.println("Is file hidden? " + file.isHidden()); } catch(Exception e) { ... Read More
The first element can be deleted from a LinkedList by using the method java.util.LinkedList.removeFirst(). This method does not have any parameters and it returns the first element of the LinkedList.The last element can be deleted from a LinkedList by using the method java.util.LinkedList.removeLast(). This method does not have any parameters and it returns the last element of the LinkedList.A program that demonstrates this is given as follows −Example Live Demoimport java.util.LinkedList; public class Demo { public static void main(String[] args) { LinkedList l = new LinkedList(); l.add("Apple"); l.add("Mango"); ... Read More
The method java.io.File.canRead() is used to check whether the file can be read in Java. This method returns true if the file specified by the abstract path name can be read by an application and false otherwise.A program that demonstrates this is given as follows −Example Live Demoimport java.io.File; public class Demo { public static void main(String[] args) { try { File file = new File("demo1.txt"); file.createNewFile(); System.out.println("The file can be read? " + file.canRead()); } catch(Exception e) { ... Read More
If you will install MySQL on your system, then you will get the default MySQL server port number i.e. 3306.To know the MySQL server port number, you can use the following query. Here, we have used the SHOW VARIABLES command. The query is as follows −mysql> SHOW VARIABLES WHERE Variable_Name = 'port';The following is the output −+---------------+-------+ | Variable_Name | Value | +---------------+-------+ | port | 3306 | +---------------+-------+ 1 row in set (0.04 sec)