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Programming Articles
Page 2493 of 2547
How to create a Box to display components from left to right in Java
Box is lightweight container that uses a BoxLayout object as its layout manager. To display components from left to right, use Box createHorizontalBox() method.Let us first create some button components −JButton button1 = new JButton("One"); JButton button2 = new JButton("Two"); JButton button3 = new JButton("Three"); JButton button4 = new JButton("Four"); JButton button5 = new JButton("Five"); JButton button6 = new JButton("Six");Now, crate a Box and align all the buttons from left to right −Box box = Box.createHorizontalBox(); box.add(button1); box.add(button2); box.add(button3); box.add(button4); box.add(button5); box.add(button6);The following is an example to create a Box to display components from left to right −Examplepackage my; import ...
Read MoreJava DatabaseMetaData getUserName() method with example
This method retrieves the user name used to establish the current connection −To retrieve the user name as known to the 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 interface.Finally, retrieve the ...
Read MoreJava DatabaseMetaData getMaxTablesInSelect() method with example.
The getMaxTablesInSelect() method of the DatabaseMetaData interface is used to find out the maximum number of tables that the underlying database allows in an SQL SELECT statement.This method returns an integer value, representing the maximum number of tables allowed in a SELECT statement. 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 ...
Read MoreHow to disable only the horizontal scrollbar in Java?
To disable only the horizontal scrollbar in Java, use the JScrollPane.HORIZONTAL_SCROLLBAR_NEVER. Let’s say you created a Box with some button components. Now, create a JScrollPane −JScrollPane scrollPane = new JScrollPane();Set the Viewport view as Box −scrollPane.setViewportView(box);Now, disable the horizontal scrollbar −scrollPane.setHorizontalScrollBarPolicy(JScrollPane.HORIZONTAL_SCROLLBAR_NEVER);The following is an example to disable only the horizontal scrollbar −Examplepackage my; import java.awt.BorderLayout; import java.awt.Dimension; import javax.swing.Box; import javax.swing.JButton; import javax.swing.JFrame; import javax.swing.JScrollPane; public class SwingDemo { public static void main(String args[]) { JFrame frame = new JFrame("Demo"); frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE); JButton button1 = new JButton("Tutorials"); JButton ...
Read MoreJava ResultSet previous() method with example
When we execute certain SQL queries (SELECT query in general) they return tabular data.The java.sql.ResultSet interface represents such tabular data returned by the SQL statements.i.e. the ResultSet object holds the tabular data returned by the methods that execute the statements which quires the database (executeQuery() method of the Statement interface in general).The ResultSet object has a cursor/pointer which points to the current row. Initially this cursor is positioned before first row.The previous() method of the ResultSet interface moves the pointer of the current (ResultSet) object to the previous row, from the current position.This method returns a boolean value specifying whether ...
Read MoreHow can I append text to JTextArea in Java?
To append text to JTextArea, use the component’s append() method. Let’sa say the following is our text in the JTextArea -JTextArea textArea = new JTextArea("The text added here is just for demo. "+ "This demonstrates the usage of JTextArea in Java. ");Now, append text to the same textArea -textArea.append("In this example we have deleted some text from the beginning."+ "We have also appended some text.");The following is an example to append text to JTextArea -Examplepackage my; import java.awt.GridLayout; import javax.swing.*; public class SwingDemo { SwingDemo() { JFrame frame = new JFrame("Demo"); JTextArea textArea ...
Read MoreHow to add some rows to a table through DefaultTableModel in Java
Let us first create a demo table −JTable table = new JTable(tableModel);Now, add a column to it −tableModel.addColumn("Languages");Add some rows to the table using insertRow() method −tableModel.insertRow(0, new Object[] { "CSS" }); tableModel.insertRow(0, new Object[] { "HTML5" }); tableModel.insertRow(0, new Object[] { "JavaScript" }); tableModel.insertRow(0, new Object[] { "jQuery" }); tableModel.insertRow(0, new Object[] { "AngularJS" });The following is an example to add a row to a table with DefaultTableModel −Examplepackage my; 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(); ...
Read MoreJava DatabaseMetaData getMaxColumnsInIndex() method with example.
The getMaxColumnsInIndex() method of the DatabaseMetaData interface is used to find out the maximum number of columns that the underlying database allows in an index.This method returns an integer value, representing the maximum number of columns allowed in an index. 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 ...
Read MoreJava DatabaseMetaData getMaxIndexLength() method with example.
The getMaxIndexLength() method of the DatabaseMetaData interface is used to find out the maximum number of bytes that the underlying database allows for an index.This method returns an integer value, representing the maximum number of byes allowed in an index. 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 ...
Read MoreJava ResultSet moveToInsertRow() method with example
When we execute certain SQL queries (SELECT query in general) they return tabular data.The java.sql.ResultSet interface represents such tabular data returned by the SQL statements.i.e. the ResultSet object holds the tabular data returned by the methods that execute the statements which quires the database (executeQuery() method of the Statement interface in general).The ResultSet object has a cursor/pointer which points to the current row. Initially this cursor is positioned before first row.The insertRow is a special row of the ResultSet in JDBC, it is associated with the updatable ResultSet objects. In it you can construct a new Row calling the UpdateXXX() ...
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