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Articles by Nancy Den
Page 15 of 18
How to handle Null values while working with JDBC?
SQL's use of NULL values and Java's use of null are different concepts. So, to handle SQL NULL values in Java, there are three tactics you can use:Avoid using getXXX( ) methods that return primitive data types.Use wrapper classes for primitive data types, and use the ResultSet object's wasNull( ) method to test whether the wrapper class variable that received the value returned by the getXXX( ) method should be set to null.Use primitive data types and the ResultSet object's wasNull( ) method to test whether the primitive variable that received the value returned by the getXXX( ) method should ...
Read MoreC++ Program to Implement Bucket Sort
In the Bucket Sorting technique, the data items are distributed of a set of buckets. Each bucket can hold similar type of data. After distributing, each bucket is sorted using another sorting algorithm. After that all elements are gathered into the main list to get the sorted form.The complexity of Bucket Sort TechniqueTime Complexity: O(n + k) for best case and average case and O(n2 ) for worst case.Space Complexity: O(nk) for worst caseInput − A list of unsorted data: 0.25 0.36 0.58 0.41 0.29 0.22 0.45 0.79 0.01 0.69 Output − Array after Sorting: 0.01 0.22 0.25 0.29 0.36 ...
Read MoreSet key in the JavaTuples KeyValue class
To set key in the JavaTuples KeyValue class, you need to use the setKey() method. Let us first see what we need to work with JavaTuples. To work with KeyValue class in JavaTuples, you need to import the following package:import org.javatuples.KeyValue;Note: Download JavaTuples Jar library to run JavaTuples program. If you are using Eclipse IDE, then Right Click Project → Properties → Java Build Path → Add External Jars and upload the downloaded JavaTuples jar file. Refer the below guide for all the steps to run JavaTuples:Steps: How to run JavaTuples program in EclipseThe following is an example to set ...
Read MoreHow to insert Timestamp value in a database using JDBC program?
Timestamp datatype in SQL is similar to Date (in SQL) both store day:month:year:hour:minute:second. In addition to this timestamp stores fractional seconds too.Inserting Timestamp in to a databaseThe PreparedStatement interface provides a method named setTimestamp() this method accepts two parameters an integer variable representing the parameter index of the place holder at which you need to store the timestamp and a long variable representing the number of milliseconds from the epoch time(standard base time I.e. January 1, 1970, 00:00:00 GMT) to the required time.ExampleAssume we have a table in the database named dispatches with the following description −+------------------+--------------+------+-----+-------------------+ | Field ...
Read MoreIterate through KeyValue Tuple in Java
To iterate through the KeyValue tuple in Java, use the Iterable and loop it through using the for loop. Let us first see what we need to work with JavaTuples. To work with KeyValue class in JavaTuples, you need to import the following package:import org.javatuples.KeyValue;Note: Download JavaTuples Jar library to run JavaTuples program. If you are using Eclipse IDE, then Right Click Project → Properties → Java Build Path → Add External Jars and upload the downloaded JavaTuples jar file. Refer the below guide for all the steps to run JavaTuples:Steps: How to run JavaTuples program in EclipseThe following is ...
Read MoreHow to get days, months and years between two Java LocalDate?
Set the two Java dates:LocalDate date1 = LocalDate.of(2019, 3, 25); LocalDate date2 = LocalDate.of(2019, 4, 29);Now, get the difference between two dates with Period class between() method:Period p = Period.between(date1, date2);Now, get the years, month and days:p.getYears() p.getMonths() p.getDays()Exampleimport java.time.LocalDate; import java.time.Period; public class Demo { public static void main(String[] args) { LocalDate date1 = LocalDate.of(2019, 3, 25); LocalDate date2 = LocalDate.of(2019, 4, 29); System.out.println("Date 1 = "+date1); System.out.println("Date 2 = "+date2); Period p = Period.between(date1, date2); System.out.println("Period = "+p); ...
Read MoreHow to check whether the given date represents weekend in Java
At first, display the current date:LocalDate date = LocalDate.now();Now, get the day of week from the above Date (current date):DayOfWeek day = DayOfWeek.of(date.get(ChronoField.DAY_OF_WEEK));On the basis of the above result, use SWITCH to check for the current day. If the day is SATURDAY/SUNDAY, then it’s Weekend.Exampleimport java.time.DayOfWeek; import java.time.temporal.ChronoField; import java.time.LocalDate; public class Demo { public static void main(String[] argv) { LocalDate date = LocalDate.now(); DayOfWeek day = DayOfWeek.of(date.get(ChronoField.DAY_OF_WEEK)); switch (day) { case SATURDAY: System.out.println("Weekend - Saturday"); ...
Read MoreJava Program to parse a mathematical expression and operators
At first, we have set the mathematical expressions:String one = "10+15*20-5/5"; String two = "3+5-6"; String three = "9+2*(6-3+7)";To parse mathematical expression, use Nashorn JavaScript in Java i.e. scripting. Nashorn invoke dynamics feature, introduced in Java 7 to improve performance.For scripting, use the ScriptEngineManager class for the engine:ScriptEngineManager scriptEngineManager = new ScriptEngineManager(); ScriptEngine scriptEngine = scriptEngineManager.getEngineByName("Nashorn");Now for JavaScript code from string, use eval i.e. execute the script. Here, we are parsing mathematical expressions set above:Object expResult1 = scriptEngine.eval(one); Object expResult2 = scriptEngine.eval(two); Object expResult3 = scriptEngine.eval(three);Exampleimport javax.script.ScriptEngine; import javax.script.ScriptEngineManager; public class Demo { public static void main(String[] args) throws ...
Read MoreJava Program to adjust LocalDate to next Tuesday with TemporalAdjusters class
At first, set a LocalDate:LocalDate localDate = LocalDate.of(2019, Month.FEBRUARY, 2);Now, adjust the LocalDate to next Tuesday using next() method:LocalDate date = localDate.with(TemporalAdjusters.next(DayOfWeek.TUESDAY));Exampleimport java.time.DayOfWeek; import java.time.LocalDate; import java.time.Month; import java.time.temporal.TemporalAdjusters; public class Demo { public static void main(String[] args) { LocalDate localDate = LocalDate.of(2019, Month.FEBRUARY, 2); System.out.println("Current Date = "+localDate); System.out.println("Current Month = "+localDate.getMonth()); LocalDate date = localDate.with(TemporalAdjusters.firstDayOfMonth()); System.out.println("First day of month = "+date); date = localDate.with(TemporalAdjusters.next(DayOfWeek.TUESDAY)); System.out.println("Next Tuesday date = "+date); } }OutputCurrent Date = 2019-02-02 Current ...
Read MoreComparison of memory-mapped I/O and I/O-mapped I/O
In Memory Mapped Input Output −We allocate a memory address to an Input-Output device.Any instructions related to memory can be accessed by this Input-Output device.The Input-Output device data are also given to the Arithmetic Logical Unit.Input-Output Mapped Input Output −We give an Input-Output address to an Input-Output device.Only IN and OUT instructions are accessed by such devices.The ALU operations are not directly applicable to such Input-Output data.So as a summary we can mention that −I/O is any general-purpose port used by processor/controller to handle peripherals connected to it.I/O mapped I/Os have a separate address space from the memory. So, total ...
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