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Technical articles with clear explanations and examples
Program to convert a Set to Stream in Java using Generics
Let’s say the following is our Set −Set set = new HashSet(Arrays.asList(15, 40, 60, 90, 120, 150, 200));Now, create a method to convert the above set to stream.StreamstreamOfInteger = convertSet(set);The method −private static Stream convertSet(Set set) { return set.stream(); }ExampleFollowing is the program to convert a Set to Stream in Java using Generics −import java.util.*; import java.util.stream.*; import java.util.function.*; public class Demo { private static Stream convertSet(Set set) { return set.stream(); } public static void main(String args[]) { Set set = new HashSet(Arrays.asList(15, 40, 60, 90, 120, 150, ...
Read MoreProgram to convert a Map to a Stream in Java
At first, create a Map and set values −Map map = new HashMap(); map.put(1, "Kevin"); map.put(2, "Ryan"); map.put(3, "Nathan"); map.put(4, "Ricky"); map.put(5, "Shane"); map.put(6, "Adam");Now, convert the Map to Stream −Stream stream = map.entrySet().stream(); System.out.println("Stream (Map to Stream) = "+ Arrays.toString(stream.toArray()));ExampleFollowing is the program to convert a Map to a Stream in Java −import java.util.*; import java.util.stream.*; public class Demo { public static void main(String args[]) { Map map = new HashMap(); map.put(1, "Kevin"); map.put(2, "Ryan"); map.put(3, "Nathan"); map.put(4, "Ricky"); map.put(5, ...
Read MoreThe String in Switch Case in Java
The introduction of Java 7 enhanced the switch case i.e. it support string as well.At first, set a string −String department = "AKD05";Now, use the same string in switch as shown below −switch(department)ExampleNow, check for every string using case as we normally do while using SWITCH CASE. Following is an example to implement String in Switch Case −public class Demo { public static void main(String[] args) { String department = "AKD05"; switch(department) { case "AKD01": System.out.println("Finance"); break; ...
Read MoreStream.distinct() in Java
The distinct() method of the stream class returns a stream consisting of the distinct elements of this stream. The syntax is as following −Stream distinct()ExampleFollowing is an example to implement the distinct() method in the Stream class −import java.util.*; public class Demo { public static void main(String[] args) { List list = Arrays.asList(10, 30, 40, 40, 50, 70, 90, 90, 100); System.out.println("List = "+list); System.out.println("Displaying only the distinct elements = "); list.stream().distinct().forEach(System.out::println); } }OutputList = [10, 30, 40, 40, 50, 70, 90, 90, 100] Displaying only ...
Read MoreStream.concat() in Java
The concat() method of the Stream class in Java creates a lazily concatenated stream whose elements are all the elements of the first stream followed by all the elements of the second stream. The syntax is as follows −concat(Stream
Read MoreHow to implement HAVING LENGTH(field) in MySQL?
Let us first create a table −mysql> create table DemoTable ( Title text ); Query OK, 0 rows affected (0.39 sec)Insert some records in the table using insert command −mysql> insert into DemoTable values('Introduction to MySQL'); Query OK, 1 row affected (0.11 sec) mysql> insert into DemoTable values('Introduction to Java'); Query OK, 1 row affected (0.09 sec) mysql> insert into DemoTable values('Introduction to SQL'); Query OK, 1 row affected (0.10 sec) mysql> insert into DemoTable values('Introduction to Python'); Query OK, 1 row affected (0.10 sec) mysql> insert into DemoTable values('Introduction to SQL'); Query OK, 1 row affected (0.09 sec) ...
Read MoreSet options while creating a MySQL table. Display the same options as well
To display, use DESC command or information_schema.columns. Let us first create a table and set options −mysql> create table DemoTable ( Color SET('RED', 'GREEN', 'BLUE', 'YELLOW') ); Query OK, 0 rows affected (0.47 sec)Case 1Here is the query to get the list of available options for SET using the DESC command −mysql> desc DemoTable;This will produce the following output −+-------+------------------------------------+------+-----+---------+-------+ | Field | Type | Null | Key | ...
Read MoreInserting random numbers into a table in MySQL?
To insert random numbers, use RAND() function from MySQL. Let us first create a table −mysql> create table DemoTable ( Value int ); Query OK, 0 rows affected (0.46 sec)Insert some records in the table using insert command −mysql> insert into DemoTable values(10); Query OK, 1 row affected (0.15 sec) mysql> insert into DemoTable values(20); Query OK, 1 row affected (0.10 sec) mysql> insert into DemoTable values(30); Query OK, 1 row affected (0.08 sec)Display all records from the table using select statement −mysql> select *from DemoTable;This will produce the following output −+-------+ | Value | +-------+ | ...
Read MoreDelete a record with tablename.columnname= value in MySQL
To delete a record in the required way, the syntax is as follows −delete from yourTableName where yourTableName .yourColumnName=yourValue;Let us first create a table −mysql> create table DemoTable ( StudentName varchar(100), StudentAge int ); Query OK, 0 rows affected (0.81 sec)Insert some records in the table using insert command −mysql> insert into DemoTable values('Chris', 21); Query OK, 1 row affected (0.15 sec) mysql> insert into DemoTable values('Robert', 20); Query OK, 1 row affected (0.12 sec) mysql> insert into DemoTable values('David', 22); Query OK, 1 row affected (0.14 sec) mysql> insert into DemoTable values('Mike', 24); Query OK, 1 row ...
Read MorePerform MySQL UPDATE on the basis of DATE value in another column
Let us first create a table −mysql> create table DemoTable( Id int NOT NULL AUTO_INCREMENT PRIMARY KEY, Name varchar(100), AdmissionDate date ); Query OK, 0 rows affected (0.42 sec)Insert some records in the table using insert command −mysql> insert into DemoTable(Name, AdmissionDate) values('Chris', '2019-11-21'); Query OK, 1 row affected (0.19 sec) mysql> insert into DemoTable(Name, AdmissionDate) values('Mike', '2019-03-11'); Query OK, 1 row affected (0.14 sec) mysql> insert into DemoTable(Name, AdmissionDate) values('Sam', '2018-04-01'); Query OK, 1 row affected (0.11 sec) mysql> insert into DemoTable(Name, AdmissionDate) values('Carol', '2019-05-01'); Query OK, 1 row affected (0.40 sec)Display all records from the ...
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