To select two fields and return a sorted array with distinct values, use aggregate framework along with $setUnion operator. Let us first create a collection with documents −> db.sortedArrayWithDistinctDemo.insertOne( ...    { value1: 4, value2: 5} ... ); {    "acknowledged" : true,    "insertedId" : ObjectId("5cc690b99cb58ca2b005e666") } > db.sortedArrayWithDistinctDemo.insertOne( ... Read More

To disallow resizing component with GridBagLayout, use the GridBagConstraints NONE constant −GridBagConstraints gbc = new GridBagConstraints(); gbc.fill = GridBagConstraints.NONE;The following is an example to disallow resizing component with GridBagLayout −Examplepackage my; import java.awt.GridBagConstraints; import java.awt.GridBagLayout; import javax.swing.JFrame; import javax.swing.JLabel; import javax.swing.JPanel; import javax.swing.JTextArea; import javax.swing.WindowConstants; public class SwingDemo {   ... Read More

Here we will see how to calculate the time taken by the process. For this problem, we will use the clock() function. The clock() is present in the time.h header file.To get the elapsed time, we can get the time using clock() at the beginning, and at the end of ... Read More

For MongoDB multidimensional array projection, you need to use aggregate framework. Let us first create a collection with documents. Here, we have multidimensional array for Student marks −> db.multiDimensionalArrayProjection.insertOne( ...    { ...       "StudentFirstName" : "Chris", ...       "StudentMarks" : [ [98, 99], [56, 79] ... Read More

To create a borderless window in Java, do not decorate the window. The following is an example to create a BorderLess Window −Examplepackage my; import java.awt.GraphicsEnvironment; import java.awt.GridLayout; import java.awt.Point; import javax.swing.JLabel; import javax.swing.JPasswordField; import javax.swing.JTextField; import javax.swing.JWindow; import javax.swing.SwingConstants; public class SwingDemo {    public static void main(String[] args) ... Read More

Here we will see some program that will return different results if they are compiled in C or C++ compilers. We can find many such programs, but here we are discussing about some of them.In C and C++, the character literals are treated as different manner. In C, they are ... Read More

To remove only a single document, use the remove() in MongoDB. Let us first create a collection with documents −> db.removeOnlyOneDocumentDemo.insertOne({"FirstName":"John", "LastName":"Smith"}); {    "acknowledged" : true,    "insertedId" : ObjectId("5cc6ca2f9cb58ca2b005e674") } > db.removeOnlyOneDocumentDemo.insertOne({"FirstName":"Carol", "LastName":"Taylor"}); {    "acknowledged" : true,    "insertedId" : ObjectId("5cc6ca399cb58ca2b005e675") } > db.removeOnlyOneDocumentDemo.insertOne({"FirstName":"David", "LastName":"Miller"}); {   ... Read More

Here, we have set panels with BorderLayout, GridLayout and FlowLayout. Within the panels, we have created components such as Button, ComboBox, etc. The following is an example to combine layouts in Java −Examplepackage my; import java.awt.BorderLayout; import java.awt.Dimension; import java.awt.FlowLayout; import java.awt.GridLayout; import javax.swing.JButton; import javax.swing.JCheckBox; import javax.swing.JFrame; import javax.swing.JPanel; ... Read More

Here we will see how to get the modulus of two floating or double type data in C. The modulus is basically finding the remainder. For this, we can use the remainder() function in C. The remainder() function is used to compute the floating point remainder of numerator/denominator.So the remainder(x, ... Read More

To check if value exists for a field in a MongoDB document, you can use find() along with $exists operator. Let us first create a collection with documents −> db.checkIfValueDemo.insertOne({"PlayerName":"John Smith", "PlayerScores":[5000, 98595858, 554343]}); {    "acknowledged" : true,    "insertedId" : ObjectId("5cc6f507af8e7a4ca6b2ad98") } > db.checkIfValueDemo.insertOne({"PlayerName":"John Doe", "PlayerScores":[]}); {   ... Read More