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Articles on Trending Technologies
Technical articles with clear explanations and examples
MySQL query to count where more than three columns values are true?
To count where more than three column values are true, you can use WHERE clause. Let us first create a table −mysql> create table DemoTable -> ( -> isMarried boolean, -> isActive boolean, -> isMember boolean, -> isOn boolean -> ); Query OK, 0 rows affected (0.61 sec)Insert some records in the table using insert command −mysql> insert into DemoTable values(true, false, true, false); Query OK, 1 row affected (0.14 sec) mysql> insert into DemoTable values(false, false, false, false); Query OK, 1 row affected (0.14 sec) mysql> insert into DemoTable values(true, true, ...
Read MoreHow to get Directories from JFileChooser in Java
To get directories from JFileChoose, use the mode setFileSelectionMode −JFileChooser file = new JFileChooser(); file.setFileSelectionMode(JFileChooser.DIRECTORIES_ONLY);The following is an example to get Directories from JFileChooser −Exampleimport javax.swing.JFileChooser; public class SwingDemo { public static void main(String[] args) { JFileChooser file = new JFileChooser(); file.setMultiSelectionEnabled(false); file.setFileSelectionMode(JFileChooser.DIRECTORIES_ONLY); int res = file.showOpenDialog(null); if (res == JFileChooser.APPROVE_OPTION) { java.io.File f = file.getSelectedFile(); System.err.println(f.getPath()); } } }Output
Read MoreAndroid NotificationBuilder Example
This example demonstrate about Android NotificationBuilder.Step 1 − Create a new project in Android Studio, go to File ⇒ New Project and fill all required details to create a new project.Step 2 − Add the following code to res/layout/activity_main.xml. Step 3 − Add the following code to src/MainActivity.package app.tutorialspoint.com.notifyme ; import android.app.NotificationChannel ; import android.app.NotificationManager ; import android.os.Bundle ; import android.support.v4.app.NotificationCompat ; import android.support.v7.app.AppCompatActivity ; import android.view.View ; public class MainActivity extends AppCompatActivity { public static final String NOTIFICATION_CHANNEL_ID = "10001" ; private final static String default_notification_channel_id = "default" ; @Override protected void ...
Read MoreHow to get the Tab Size of a JTextArea in Java?
To get the tab size from a JTextArea, you can use the getTabSize() method −textArea.getTabSize();We will assign it to int variable and display the size in the Console −int size = textArea.getTabSize(); System.out.println("Tab Size = "+size);The following is an example to set the tab size of a JTextArea −Examplepackage my; import java.awt.GridLayout; import javax.swing.*; public class SwingDemo { SwingDemo() { JFrame frame = new JFrame(); JTextArea textArea = new JTextArea("This is demo text."); int size = textArea.getTabSize(); System.out.println("Tab Size = "+size); frame.add(textArea); ...
Read MoreHow can I update a field in a MySQL database table by adding a value in the second table with a value from the first table?
Let us first create a table −mysql> create table DemoTable1 ( value int ); Query OK, 0 rows affected (0.59 sec)Insert some records in the table using insert command −mysql> insert into DemoTable1 values(10); Query OK, 1 row affected (0.17 sec)Display all records from the table using select statement −mysql> select *from DemoTable1;Output+-------+ | value | +-------+ | 10 | +-------+ 1 row in set (0.00 sec)Following is the query to create second table −mysql> create table DemoTable2 ( value1 int ); Query OK, 0 rows affected (0.62 sec)Insert some records in the table ...
Read MoreHow do I check to see if a column name exists in a CachedRowSet in JDBC?
CachedRowSet interface does not provide any methods to determine whether a particular column exists.Therefore, to find whether a RowSet contains a specific column, you need to compare the name of each column in the RowSet with the required name. To do so −Retrieve the ResultSetMetaData object from the RowSet using the getMetaData() method.ResultSetMetaData meta = rowSet.getMetaData();Get the number of columns in the RowSet using the getColumnCount() method.int columnCount = meta.getColumnCount();The getColumnName() method returns the name of the column of the specified index. Using this method retrieve the column names of the RowSet from index 1 to column count and compare ...
Read MoreWhat is the difference between static_cast<> and C style casting?
Here we will see what are the differences between static_cast and normal C style cast.The normal cast like (int)x is C style typecasting where static_cast(x) is used in C++.This static_cast() gives compile time checking facility, but the C style casting does not support that. This static_cast() can be spotted anywhere inside a C++ code. And using this C++ cast the intensions are conveyed much better.In C like cast sometimes we can cast some type pointer to point some other type data.Like one integer pointer can also point character type data, as they are quite similar, only difference is character has ...
Read MoreHow to activate and deactivate JFrame in Java
Here, we are activating a frame. For deactivation, we have used dispose −Thread.sleep(2000); frame.setVisible(false);The frame first activates and then deactivates after 2 seconds since we have set sleep to 2000 miliseconds.The following is an example to activate and deactivate JFrame −Exampleimport java.awt.Frame; import javax.swing.JFrame; import javax.swing.JLabel; public class SwingDemo { public static void main(String[] args) throws InterruptedException { JFrame frame = new JFrame(); frame.add(new JLabel("Demo")); frame.pack(); frame.setVisible(true); Thread.sleep(2000); frame.setState(Frame.ICONIFIED); Thread.sleep(2000); frame.setVisible(false); frame.dispose(); ...
Read MoreWhat are the sizes of the icons in Android notifications action-buttons?
Asset Size: 32dp x 32dp Optical Square: 24dp x 24dp Color (Enabled): #FFFFFF 80% opacity Color (Disabled): #FFFFFF 30% opacityClick here to download the project code
Read MoreJava Program to display JTabbedPane on the right
To display JTabbedPane on the right, you need to set the location to the right using the constant RIGHT −JTabbedPane tabbedPane = new JTabbedPane(JTabbedPane.RIGHT);The following is an example to display JTabbedPane on the right −Examplepackage my; import javax.swing.*; public class SwingDemo { public static void main(String args[]) { JFrame frame = new JFrame("Technologies"); JTabbedPane tabbedPane = new JTabbedPane(JTabbedPane.RIGHT); JPanel panel1, panel2, panel3, panel4, panel5; panel1 = new JPanel(); panel2 = new JPanel(); panel3 = new JPanel(); panel4 = ...
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