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Programming Articles
Page 2476 of 2547
Insert a tab after the first tab of a JTabbedPane container
We are inserting a tab just after the first tab by using the index value 1. Here, index 1 would be location 2nd i.e. just after the first tab of the JTabbedPane container.The following is an example to insert a tab after the first tab −Examplepackage my; import javax.swing.*; import java.awt.*; public class SwingDemo { public static void main(String args[]) { JFrame frame = new JFrame("Devices"); JTabbedPane tabbedPane = new JTabbedPane(); JTextArea text = new JTextArea(100, 100); JPanel panel1, panel2, panel3, panel4, panel5, panel6, panel7, panel8; ...
Read MoreHow to deselect a range of rows from a table in Java?
Let’s say, we have selected a range of rows using addRowSelectionInterval() as shown in the demo screenshot −Now, we will deselect the above shown selected rows using removeRowSelectionInterval(). The range is to be set here for interval i.e rows 3 to 6 (index 2 to 5) will get deselected −table.removeRowSelectionInterval(2, 5);The following is our example to deselect a range of rows −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(); JTable table = new JTable(tableModel); ...
Read MoreHow do I generate random floats in C++?
In C or C++, we cannot create random float directly. We can create random floats using some trick. We will create two random integer values, then divide them to get random float value.Sometimes it may generate an integer quotient, so to reduce the probability of that, we are multiplying the result with some floating point constant like 0.5.Example#include #include #include using namespace std; main() { srand((unsigned int)time(NULL)); float a = 5.0; for (int i=0;i
Read MoreJava Program to display the contents in JTextArea
The following is an example to display the contents of a text file in JTextArea −Exampleimport java.awt.*; import java.awt.event.*; import javax.swing.*; public class SwingDemo { private JFrame mainFrame; private JLabel statusLabel; private JPanel controlPanel; public SwingDemo() { prepareGUI(); } public static void main(String[] args) { SwingDemo demo = new SwingDemo(); demo.showTextAreaDemo(); } private void prepareGUI() { mainFrame = new JFrame("Java Swing"); mainFrame.setSize(400, 400); mainFrame.setLayout(new GridLayout(3, 1)); mainFrame.addWindowListener(new WindowAdapter() { ...
Read MoreCan we combine GridLayout and BorderLayout in Java?
Yes, we can do that with Java Swings as shown below. Here, we have a panel set with GridLayout and another panel with BorderLayout −JPanel panelGrid = new JPanel(new GridLayout(10, 5, 10, 10)); panelGrid.add(new JCheckBox("Demo CheckBox1")); panelGrid.add(new JCheckBox("Demo CheckBox2")); panelGrid.add(btnAPanel); panelGrid.add(btnBPanel); panelGrid.add(btnCPanel); panelGrid.add(btnDPanel); JPanel panelBrdLayout = new JPanel(new BorderLayout()); panelBrdLayout.add(panelGrid, BorderLayout.NORTH);The following is an example to combine GridLayout and BorderLayout −package my; import java.awt.BorderLayout; import java.awt.Dimension; import java.awt.GridLayout; import javax.swing.JButton; import javax.swing.JCheckBox; import javax.swing.JFrame; import javax.swing.JPanel; public class SwingDemo { public static void main(String[] args) { JButton btnA = new JButton("Button1"); JButton btnB ...
Read MoreHow to make JTable single selectable in Java?
To make JTable single selectable in Java, you need to set the selection mode to be SINGE_SELECTION. Let’s say the following is our table −String[][] rec = { { "001", "Shirts", "40" }, { "002", "Trousers", "250" }, { "003", "Jeans", "25" }, { "004", "Applicances", "90" }, { "005", "Mobile Phones", "200" }, { "006", "Hard Disk", "150" }, }; String[] header = { "ID", "Product", "Quantity" }; JTable table = new JTable(rec, header);Set the selection more to make it single selectable with setSelectionMode() method −table.setSelectionMode(ListSelectionModel.SINGLE_SELECTION);Let us see an example to set the ...
Read MoreHow to determine database type (name) for a given JDBC connection?
One way to get the name of the underlying database you have connected with is by invoking the getDatabaseProductName() method of the DatabaseMetaData interface. This method returns the name of the underlying database in String format.Therefore, to retrieve the name of your current database using Java code −Retrieve the DatabaseMetaData object of the current Connection using the getMetaData() method.//Retrieving the meta data object DatabaseMetaData metaData = con.getMetaData();Then, get the product name of the underlying database you have connected to using the getDatabaseProductName() method of the DatabaseMetaData interface as −//retrieving the name of the database String product_name = metaData.getDatabaseProductName();ExampleFollowing JDBC program ...
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 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 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 ...
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