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Programming Articles
Page 2484 of 2547
Set whether the cell in the table model can be selected or deselected in Java?
We can set or disallow selection of cell in the table using setCellSelectionEnabled(). The following is an example. −If you want to allow selection of cell, then set the method to TRUE −table.setCellSelectionEnabled(true);If you want to disallow selection of cell, then set the method to FALSE −table.setCellSelectionEnabled(false);Here we have disallowed selection of a cell −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); tableModel.addColumn("Language/ Technology"); ...
Read MoreHow to determine whether the JSlider is currently snapping to tick marks in Java?
At first, we will create a slider and set it to snap to tick marks:JSlider slider = new JSlider(JSlider.HORIZONTAL, 0, 100, 40); slider.setMinorTickSpacing(10); slider.setMajorTickSpacing(20); slider.setPaintTicks(true); slider.setPaintLabels(true); slider.setSnapToTicks(true);After that, we will check whether the slider is currently snapping to tick marks. The result would be displayed in the TRUE/FALSE booleanslider.getSnapToTicks()Display the result in the Console as shown below:System.out.println("Snapping to tick marks? = "+slider.getSnapToTicks());The following is an example to determine whether the slider is currently snapping to tick marks:Examplepackage my; import java.awt.Color; import java.awt.Font; import javax.swing.JFrame; import javax.swing.JPanel; import javax.swing.JSlider; import javax.swing.WindowConstants; public class SwingDemo { public static void main(String[] args) ...
Read MoreHow to retrieve binary data from a table using JDBC?
SQL databases provide a datatype named Blob (Binary Large Object) in this, you can store large binary data like images.To retrieve binary (stream) values from a table JDBC provides a method called getBinaryStream() in the PreparedStatement interface.It accepts an integer representing the index of the column of the table and retrieves the binary data from it.You can retrieve binary data from a table using this method as shown below −FileInputStream fin = new FileInputStream("javafx_logo.jpg"); pstmt.setBinaryStream(3, fin);ExampleLet us create a table with name tutorials_data in MySQL using the CREATE statement as shown below −CREATE TABLE tutorials_data( Name VARCHAR(255), Type ...
Read MoreSort String Array alphabetically by the initial character only in Java
Here, we are sorting string array alphabetically by the initial character i.e. ‘J’ for ‘John’ will come after ‘Chris’ since the first character of ‘Chris’ is ‘C’.Let us first create a String array:String[] strArr = { "PQRS", "AB", "RSTUVW", "RST", "U", "UVWXY", "OUJBG" };Now, sort the string array based on the first character:Arrays.sort(strArr, (str1, str2) -> str1.charAt(0) - str2.charAt(0));The following is an example to sort String Array alphabetically by the initial character only:Exampleimport java.util.Arrays; public class Demo { public static void main(String[] args) { String[] strArr = { "PQRS", "AB", "RSTUVW", "RST", "U", "UVWXY", "OUJBG" }; ...
Read MoreHow can I set scrollbars to never appear in Java?
To set scrollbars to never appear, use the JScrollPane.HORIZONTAL_SCROLLBAR_NEVER and JScrollPane.VERTICAL_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, set the scrollbars to never appear:scrollPane.setHorizontalScrollBarPolicy(JScrollPane.HORIZONTAL_SCROLLBAR_NEVER); scrollPane.setVerticalScrollBarPolicy(JScrollPane.VERTICAL_SCROLLBAR_NEVER);The following is an example to set scrollbars to never appear: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("One"); JButton button2 ...
Read MoreHow to add tooltip to JLabel in Java?
Tooltip is visible whenever you will place the mouse cursor on the label. Use the setToolTipText() method to add tooltip to JLabel −label.setToolTipText("This is a demo tooltip");The following is an example to add tooltip to JLabel −Exampleimport java.awt.Color; import java.awt.Font; import javax.swing.*; import javax.swing.border.Border; public class SwingDemo { public static void main(String args[]) { JFrame frame = new JFrame("Demo"); JLabel label; label = new JLabel("Demo Label!"); label.setFont(new Font("Verdana", Font.PLAIN, 14)); label.setToolTipText("This is a demo tooltip"); Border border = BorderFactory.createLineBorder(Color.ORANGE); ...
Read MoreHow to get the properties of a driver using JDBC?
You can get the properties of a driver using the getPropertyInfo() method of the Driver interface.DriverPropertyInfo[] info = driver.getPropertyInfo(mysqlUrl, null);This method accepts a two parameters: A String variable representing the URL of the database, an object of the class Properties and, returns an array of the DriverPropertyInfo objects, where each object holds information about the possible properties of the current driver.From a DriverPropertyInfo object you can get the information such as name of the property, value of the property, description, choices and, if it is required or not, using its fields name, value, description, choices, required, respectively.DriverPropertyInfo[] info = driver.getPropertyInfo(mysqlUrl, ...
Read MoreHow to change display mode with Java Swings
To change display mode with Java Swings, use the setDisplayMode() method. Here, we have set the Display mode as:new DisplayMode(800, 600, 32, 60));Now, when you will run the program, the frame would be visible in a different resolution than the actual set resolution of your system.The following is an example to change display mode with Java Swings:Exampleimport java.awt.DisplayMode; import java.awt.GraphicsDevice; import java.awt.GraphicsEnvironment; import javax.swing.JFrame; public class SwingDemo { public static void main(String[] args) { JFrame frame = new JFrame(); frame.setSize(800, 600); frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE); GraphicsDevice graphics = GraphicsEnvironment.getLocalGraphicsEnvironment() ...
Read MoreHow to filter String list by starting value in Java?
Let’s first create a String list −List list = new ArrayList(); list.add("wxy"); list.add("zabc"); list.add("ddd2"); list.add("def"); list.add("ghi"); list.add("wer"); list.add("uij"); list.add("wqy");To filter String list by starting value, use filter() and startsWith() −list.stream().filter((b) -> b.startsWith("w"))The following is an example to filter string list by starting value −Exampleimport java.util.ArrayList; import java.util.List; public class Demo { public static void main(final String[] args) { List list = new ArrayList(); list.add("wxy"); list.add("zabc"); list.add("ddd2"); list.add("def"); list.add("ghi"); list.add("wer"); list.add("uij"); list.add("wqy"); ...
Read MoreDelete the first 10 characters from JTextArea in Java
Let’s say the following is our JTextArea with default text −JTextArea textArea = new JTextArea("The text added here is just for demo. " + "This demonstrates the usage of JTextArea in Java. In this example we have" + "deleted some text.");Now to remove the first 10 characters, use replaceRange() method and set null from one end to another i.e. deleting characters in a range. The replaceRaneg() method Replaces text from the indicated start to end position with the new text specified i.e.e here null will replace the first 10 characters −int start = 0; int end = 10; ...
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