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Programming Articles
Page 2489 of 2547
Java DatabaseMetaData getDatabaseMajorVersion() method with example
The getDatabaseMajorVersion() method of the DatabaseMetaData interface returns the major version of the underlying database in integer format.To get major version of the underlying database −Make sure your database is up and running.Register the driver using the registerDriver() method of the DriverManager class. Pass an object of the driver class corresponding to the underlying database.Get the connection object using the getConnection() method of the DriverManager class. Pass the URL the database and, user name, password of a user in the database, as String variables.Get the DatabaseMetaData object with respect to the current connection using the getMetaData() method of the Connection ...
Read MoreHow to make a JTree editable in Java?
To make JTree editable in Java, use the TreeCellEditor class. With that, set the setEditable() method to true −TreeCellEditor editor = new DefaultCellEditor(textField); tree.setEditable(true); tree.setCellEditor(editor);The above will make the tree editable. The following is an example to make a JTree editable in Java −Examplepackage my; import javax.swing.DefaultCellEditor; import javax.swing.JFrame; import javax.swing.JTextField; import javax.swing.JTree; import javax.swing.tree.DefaultMutableTreeNode; import javax.swing.tree.TreeCellEditor; public class SwingDemo { public static void main(String[] args) throws Exception { JFrame frame = new JFrame("Demo"); DefaultMutableTreeNode node = new DefaultMutableTreeNode("Products"); DefaultMutableTreeNode node1 = new DefaultMutableTreeNode("Clothing"); DefaultMutableTreeNode node2 = ...
Read MoreJava DatabaseMetaData getColumns() method with example
This method retrieves the description of the columns of a table. It accepts 4 parameters −catalog - A string parameter representing the name (or, name pattern) of the catalog (database in general) in which the table (that contains the columns of which you need to retrieve the description about) exists. pass "" to get the description of the columns in tables with no catalog and, pass null if you don't want to use catalog and thus narrow the search.schemaPattern - A String parameter representing the name (or, name pattern) of the schema of the table, pass "" if in case ...
Read MoreJava DatabaseMetaData getDefaultTransactionIsolation() method with example
In a database system where more than one transaction is being executed simultaneously and in parallel, the property of isolation states that all the transactions will be carried out and executed as if it is the only transaction in the system. No transaction will affect the existence of any other transaction.The getDefaultTransactionIsolation() method of the DatabaseMetaData interface returns the default isolation level of the underlying database in integer format.To know the default transaction isolation of the underlying database −Make sure your database is up and running.Register the driver using the registerDriver() method of the DriverManager class. Pass an object of ...
Read MoreC++ Program to Find k Numbers Closest to Median of S, Where S is a Set of n Numbers
This is a C++ Program to find k numbers closest to Median of S, where S is a set of n numbers.AlgorithmsBegin function partition() for partitioning the array on the basis of values at high as pivot value: Arguments: a[]=an array. l=low H=high Body of the function: Declare variables pivot, in, i Initialize in = l Set pivot = h For i=l to h-1 if(a[i] < a[pivot]) swap a[i] and a[in]) increment in. ...
Read MoreWhat are the Selection Modes in a JTable with Java?
Selection modes sets the table's selection mode to allow only single selections, a single contiguous interval, or multiple intervals. Let us see the selection modes one by one −Single Selection modeThe following is an example of Single Selection mode for a JTable. It allows you to select one cell at a time −Examplepackage my; import java.awt.Color; import javax.swing.BorderFactory; import javax.swing.JFrame; import javax.swing.JPanel; import javax.swing.JScrollPane; import javax.swing.JTable; import javax.swing.ListSelectionModel; import javax.swing.border.TitledBorder; public class SwingDemo { public static void main(String[] args) { JFrame frame = new JFrame(); JPanel panel = new JPanel(); ...
Read MoreC++ Program to Find ith Largest Number from a Given List Using Order-Statistic Algorithm
This is a C++ program to find ith largest number from a given list using Order-Statistic Algorithm.AlgorithmsBegin function Insert() to insert nodes into the tree: Arguments: root, d. Body of the function: If tree is completely null then insert new node as root. If d = tmp->data, increase the count of that particular node. If d < tmp->data, move the tmp pointer to the left child. If d > tmp->data, move the tmp pointer to the right child. End Begin ...
Read MoreHow can I set a table in a JPanel in Java?
Let us first set rows and columns for our table −String[][] rec = { { "1", "Steve", "AUS" }, { "2", "Virat", "IND" }, { "3", "Kane", "NZ" }, { "4", "David", "AUS" }, { "5", "Ben", "ENG" }, { "6", "Eion", "ENG" }, }; String[] header = { "Rank", "Player", "Country" };Now, set the above in a table as rows and columns −JTable table = new JTable(rec, header);Add the table in the panel −JPanel panel = new JPanel(); panel.add(new JScrollPane(table));The following is an example to create a table in a panel −Examplepackage my; ...
Read MoreHow to make a canvas in Java Swing?
To make a canvas with Java Swing, use the Graphics2D class −public void paint(Graphics g) { Graphics2D graphic2d = (Graphics2D) g; graphic2d.setColor(Color.BLUE); graphic2d.fillRect(100, 50, 60, 80); }Above, we have created a rectangle and also added color to it.The following is an example to make a canvas in Java −Examplepackage my; import java.awt.Color; import java.awt.Graphics; import java.awt.Graphics2D; import javax.swing.JFrame; import javax.swing.JPanel; public class SwingDemo extends JPanel { @Override public void paint(Graphics g) { Graphics2D graphic2d = (Graphics2D) g; graphic2d.setColor(Color.BLUE); graphic2d.fillRect(100, 50, 60, 80); } public ...
Read MoreJava DatabaseMetaData getMaxCharLiteralLength() method with example.
The getMaxCharLiteralLength() method of the DatabaseMetaData interface is used to find out the maximum number of characters that the underlying database allows for a character literal.This method returns an integer value, representing the maximum length of a character literal. If this value is 0 it indicates that there is no limit or, limit is unknown.To get the DatabaseMetaData object −Make sure your database is up and running.Register the driver using the registerDriver() method of the DriverManager class. Pass an object of the driver class corresponding to the underlying database.Get the connection object using the getConnection() method of the DriverManager class. ...
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