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Articles by Nishtha Thakur
Page 19 of 40
How to highlight a row in a table with Java Swing?
To highlight a row in a table, you can use the addRowSelectionInterval() method. At first create a table −DefaultTableModel tableModel = new DefaultTableModel(); JTable table = new JTable(tableModel);Add some columns −tableModel.addColumn("Language/ Technology"); tableModel.addColumn("Text Tutorial"); tableModel.addColumn("Video Tutorial"); tableModel.addColumn("Views");Now, add rows to the table −tableModel.addRow(new Object[] { "NodeJS", "No", "Yes", "2350"}); tableModel.addRow(new Object[] { "MVC", "Yes", "No", "1500"}); tableModel.addRow(new Object[] { "ASP.NET", "Yes", "Yes", "3400"}); tableModel.addRow(new Object[] { "F#", "Yes", "No", "7890"}); tableModel.addRow(new Object[] { "Blockchain", "Yes", "No", "10600"}); tableModel.addRow(new Object[] { "SharePoint", "Yes", "Yes", "4900"});Highlight a single row by adding interval of rows. Set the same index for both the parameters ...
Read MoreEfficient way to remove all entries from MongoDB?
If you will try to use the method drop(), then it will delete all information about the collection. Indexing is fast. However, if you will use the method remove(), then it removes all records but keeps the collection and indexes.Let us check with the help of example.Using drop()Let us first create a collection with documents −> db.dropWorkingDemo.createIndex({"FirstName":1}); { "createdCollectionAutomatically" : true, "numIndexesBefore" : 1, "numIndexesAfter" : 2, "ok" : 1 } > db.dropWorkingDemo.insertOne({"FirstName":"John"}); { "acknowledged" : true, "insertedId" : ObjectId("5cdd8742bf3115999ed511e9") }Following is the query to display all documents from a collection with the ...
Read MoreConditional $first in MongoDB aggregation ignoring NULL?
You can use $match operator under aggregate() to get the first record. Let us first create a collection with documents −> db.conditionalFirstDemo.insertOne({_id:100, "StudentName":"Chris", "StudentSubject":null}); { "acknowledged" : true, "insertedId" : 100 } > db.conditionalFirstDemo.insertOne({_id:101, "StudentName":"Chris", "StudentSubject":null}); { "acknowledged" : true, "insertedId" : 101 } >db.conditionalFirstDemo.insertOne({_id:102, "StudentName":"Chris", "StudentSubject":"MongoDB"}); { "acknowledged" : true, "insertedId" : 102 } >db.conditionalFirstDemo.insertOne({_id:103, "StudentName":"Chris", "StudentSubject":"MongoDB"}); { "acknowledged" : true, "insertedId" : 103 } > db.conditionalFirstDemo.insertOne({_id:104, "StudentName":"Chris", "StudentSubject":null}); { "acknowledged" : true, "insertedId" : 104 }Following is the query to display all documents from a collection with the help of find() method −> db.conditionalFirstDemo.find();This will produce the following ...
Read MoreHow to insert/store JSON array into a database using JDBC?
A Json array is an ordered collection of values that are enclosed in square brackets i.e. it begins with ‘[’ and ends with ‘]’. The values in the arrays are separated by ‘, ’ (comma).Sample JSON array{ "books": [ Java, JavaFX, Hbase, Cassandra, WebGL, JOGL] }The json-simple is a light weight library which is used to process JSON objects. Using this you can read or, write the contents of a JSON document using Java program.JSON-Simple maven dependencyFollowing is the maven dependency for the JSON-simple library − com.googlecode.json-simple json-simple ...
Read MoreMiddle of three using minimum comparisons in C++
In this section, we will see how to find the middle of three given values by comparing them. So if three numbers are given like (10, 30, 20), then it will find 20 as this is the middle element. Let us see the algorithm first, then we will implement that algorithm into C++ code.Algorithmmiddle_of_three(a, b, c): Input: Three numbers a, b and c Output: The middle of these three Begin if a > b, then if b > c, then return b else if a > c, then ...
Read MoreHow to add a sub-document to sub-document array in MongoDB?
Use the $push operator to add a sub-document. Let us first create a collection with documents −> db.subDocumentToSubDocumentDemo.insertOne( { "_id" :101, "StudentName" : "Larry", "StudentAge" : 21, "StudentDetails" : [ { "StudentCountryName" : "US", "StudentFavouriteSubjectList" : [ ] } ] } ); { "acknowledged" : true, "insertedId" : 101 }Following is the query to display all documents from a collection with the help ...
Read Morekbhit in C language
Here we will see the kbhit functionality in C. The kbhit is basically the Keyboard Hit. This function is present at conio.h header file. So for using this, we have to include this header file into our code.The functionality of kbhit() is that, when a key is pressed it returns nonzero value, otherwise returns zero.Example#include #include main() { char ch; printf("Enter keys (ESC to exit)"); while (1) { //define infinite loop for taking keys if (kbhit) { ch = getch(); // Get typed character into ch ...
Read MoreName Mangling and extern “C” in C++
In C++ we can use the function overloading feature. Using this feature, we can create functions with same name. The only difference is the type of the arguments, and the number of arguments. The return type is not considered here. Now the question comes how the C++ distinguishes overloaded functions in object code?In the object code, it changes the name by adding information about the arguments. The technique which is applied here is called the Name Mangling. C++ has no standardized technique for name mangling. So different compiler uses different techniques.Here is an example of Name Mangling. The overloaded functions ...
Read MoreHow to apply adjustments to the last column of a JTable only, when the width of any column is changed in Java Swing?
To apply adjustments to the last column only, use the setAutoResizeMode and set the mode. The mode here would be AUTO_RESIZE_LAST_COLUMN. This will allow you to adjust only the last columns even if any of the column header is dragged to resize.Let us first see an example to create a table in Java −Examplepackage my; import java.awt.Color; import java.awt.Font; import javax.swing.JFrame; import javax.swing.JScrollPane; import javax.swing.JTable; import javax.swing.table.DefaultTableModel; public class SwingDemo { public static void main(String[] argv) throws Exception { DefaultTableModel tableModel = new DefaultTableModel(); JTable table = new JTable(tableModel); tableModel.addColumn("Technology"); ...
Read MoreHow to access subdocument value when the key is a number in MongoDB?
To access subdocument value, let us first create a collection with documents −> db.accessSubDocumentDemo.insertOne( ... { ... ... "Details" : { ... "1" : { ... "StudentLowerScore" : "33", ... "StudentHoghScore" : "55" ... }, ... "2" : { ... "StudentLowerScore" : "45", ... "StudentHoghScore" : "65" ... }, ... "3" : ...
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