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Articles by Jai Janardhan
Page 3 of 5
Find the minimum element of a Vector in Java
The minimum element of a Vector can be obtained using the java.util.Collections.min() method. This method contains a single parameter i.e. the Vector whose minimum element is determined and it returns the minimum element from the Vector.A program that demonstrates this is given as follows −Exampleimport java.util.Collections; import java.util.Vector; public class Demo { public static void main(String args[]) { Vector vec = new Vector(); vec.add(7); vec.add(3); vec.add(9); vec.add(5); vec.add(8); System.out.println("The Vector elements are: " + vec); ...
Read MoreSwap two variables in one line in Java
In order to swap two variable using single expression or in single line we could use bitwise XOR operator of Java. As we now that in Java XOR functions as XOR of two numbers a and b returns a number which has all the bits as 1 wherever bits of a and b differs. So for swapping of two variable we would use this operator as Example public class SwapUsingBitwise { public static void main(String[] args) { int a = 8 ; int b = 10; ...
Read MoreWhat are final, abstract, synchronized non-access modifiers in Java?
The abstract keyword is used to declare methods abstract methods and abstract classes. Once a method is declared abstract we should not specify body for those. And once a class is declared abstract it cannot be instantiated. Example abstract class Employee { private String name; private String address; private int number; public Employee(String name, String address, int number) { System.out.println("Constructing an Employee"); this.name = name; ...
Read MoreHow can I return the values of columns from MySQL table as a set of values?
With the help of MySQL MAKE_SET() function, we can return the values of columns from MySQL table as a set of values. To understand it, we are taking the example of Student_Name table which has the following data −mysql> Select * from Student_Name; +---------+-------+---------+ | FName | Mname | Lname | +---------+-------+---------+ | Rahul | NULL | Singh | | Gaurav | Kumar | NULL | | Harshit | NULL | Khurana | | Yash | Pal | Sharma | ...
Read MoreWhat is the use of MySQL IFNULL() control flow function?
MySQL IFNULL() control flow function will return the first argument if it is not NULL otherwise it returns the second argument.SyntaxIFNULL(expression1, expression2)Here if expression1 is not NULL then IFNULL() will return expression1 otherwise expression2. It will return NULL if both of the arguments are NULL. Following example will exhibit this −mysql> Select IFNULL(NULL, 'Ram'); +--------------------+ | IFNULL(NULL, 'Ram') | +--------------------+ | Ram | +--------------------+ 1 row in set (0.00 sec) mysql> Select IFNULL('Shyam', 'Ram'); +-----------------------+ | IFNULL('Shyam', 'Ram') | +-----------------------+ | Shyam ...
Read MoreHow MySQL FIELD() and ELT() functions are complements of each other?
On the basis of the working of both the functions, we can say that both are the complement of each other. Actually, as we know that FIELD() function, on providing a string as an argument, returns the index number of the string from string list and ELT() function, on providing index number as an argument, returns the string from string list. In the following example, we have applied both the functions on the same string, it would demonstrate the concept −Examplemysql> SELECT ELT(4, 'Ram', 'is', 'good', 'boy')As Result; +--------+ | Result | +--------+ | boy | +--------+ ...
Read MoreHow wildcard characters can be used with MySQL CONCAT() function?
As we know that wildcards are characters that help search data matching complex criteria. Wildcards are used in conjunction with LIKE comparison operator or NOT LIKE comparison operator. MySQL allows us to match the data, from the output of CONCAT() function, with the help of wildcard and comparison operators LIKE or NOT LIKE. An example from ‘Student’ table is given to make it clearer.Examplemysql> Select CONCAT(Name, ' ', Last_name) AS NAME from student Where CONCAT(Name, ' ', Last_Name) LIKE '%Kumar%'; +---------------+ | NAME | +---------------+ | Gaurav Kumar | | Harshit Kumar | +---------------+ ...
Read MoreHow can we update columns values on multiple rows with a single MySQL UPDATE statement?
Column values on multiple rows can be updated in a single UPDATE statement if the condition specified in WHERE clause matches multiple rows. In this case, the SET clause will be applied to all the matched rows.ExampleSuppose we have a table ‘tender’ as follows −mysql> Select * from tender; +-----------+---------+------+ | tender_id | company | rate | +-----------+---------+------+ | 200 | ABC | 1000 | | 300 | ABD | 5000 | | 301 | ABE | 6000 | | 302 ...
Read MoreHow can we apply a NOT NULL constraint to a column of an existing MySQL table?
We can apply the NOT NULL constraint to a column of an existing MySQL table with the help of ALTER TABLE statement. SyntaxALTER TABLE table_name MODIFY colum_name datatype NOT NULL; Examplemysql> Create table test123(ID INT, Date DATE); Query OK, 0 rows affected (0.19 sec) mysql> Describe test123; +-------+---------+------+-----+---------+-------+ | Field | Type | Null | Key | Default | Extra | +-------+---------+------+-----+---------+-------+ | ID | int(11) | YES | | NULL | | | Date | date ...
Read MoreComb Sort
The basic idea of comb sort and the bubble sort is same. In other words, comb sort is an improvement on the bubble sort. In the bubble sorting technique, the items are compared with the next item in each phase. But for the comb sort, the items are sorted in a specific gap. After completing each phase, the gap is decreased. The decreasing factor or the shrink factor for this sort is 1.3. It means that after completing each phase the gap is divided by 1.3.The complexity of Comb Sort TechniqueTime Complexity: O(n log n) for the best case. O(n^2/2^p) (p ...
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