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Programming Articles
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How to get the number of siblings of this node in a JTree?
To get the count of siblings of this node, use the getSiblingCount() method. Let’s say you have a node with 4 child nodes. Find the sibling of any of this node’s child node. Here, “eight” is the child node −eight.getSiblingCount());Note − Remember, a node is it’s own sibling.The following is an example to get the number of siblings of this node in a JTree −Examplepackage my; import javax.swing.JFrame; import javax.swing.JTree; import javax.swing.tree.DefaultMutableTreeNode; 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 (Product1 - P66778)"); DefaultMutableTreeNode node2 = new DefaultMutableTreeNode("Accessories (Product2 - P66779)"); DefaultMutableTreeNode node3 = new DefaultMutableTreeNode("Home Decor (Product3 - ...
Read MoreA Boolean Matrix Question in C++?
Here we will see one interesting Boolean matrix problem. One Boolean matrix is given which contains 0’s and 1’s. Our goal is to find where 1 is marked. If the 1 is marked at position mat[i, j], then we will make all entries to 1 of the row i and column j. Let us see an example. If the matrix is like below −1 0 0 1 0 0 0 0 0 0 0 0 0 1 0 0Then after modification, it will be −1 1 1 1 1 1 0 1 1 1 0 1 1 1 1 1AlgorithmmatrixUpdate(matrix[R, ...
Read MoreJava DatabaseMetaData supportsSavepoints() method with example
The supportsSavepoints() method of the DatabaseMetaData interface is used to determine whether the underlying database supports savepoints.This method returns a boolean value which is −True, when the underlying database supports savepoints.False, when the underlying database doesn't support savepoints.To determine whether the underlying database supports save points −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 ...
Read MoreHow to customize how a JTabbedPane looks in Java?
To customize how a JTabbedPane looks, change its font style, font face, font size and the background and foreground colors.Let’s say the following is the JTabbedPane −JTabbedPane tabbedPane = new JTabbedPane();Now, let us customize the above created JTabbedPane −tabbedPane.setBackground(Color.orange); tabbedPane.setForeground(Color.white); Font font = new Font("Verdana", Font.CENTER_BASELINE, 18); tabbedPane.setFont(font);The following is an example to customize JTabbedPane −Examplepackage my; import javax.swing.*; import java.awt.*; public class SwingDemo { public static void main(String args[]) { JFrame frame = new JFrame("Technologies"); JTabbedPane tabbedPane = new JTabbedPane(); JPanel panel1, panel2, panel3, panel4, panel5; ...
Read MoreWhat are the rules to be followed while using varargs in java?
Since JSE1.5 you can pass a variable number of values as argument to a method. These arguments are known as var args and they are represented by three dots (…)Syntaxpublic myMethod(int ... a) { // method body }Rules to follow while using varargs in JavaWe can have only one variable argument per method. If you try to use more than one variable arguments a compile time error is generated.ExampleIn the following Java example we are trying to accepts two varargs from the method sample().public class VarargsExample{ void demoMethod(int... ages), String... names) { ...
Read MoreHow to change Button Border in Java Swing
For Button border, use createLineBorder() method in Java, which allows you to set the color of the Border as well:JButton button = new JButton("Demo Button!"); Border border = BorderFactory.createLineBorder(Color.BLUE);The following is an example to change button border in Java:Exampleimport java.awt.BorderLayout; import java.awt.Color; import java.awt.Container; import javax.swing.BorderFactory; import javax.swing.JButton; import javax.swing.JFrame; import javax.swing.border.Border; public class SwingDemo { public static void main(String args[]) { JFrame frame = new JFrame("Button Border"); Container container = frame.getContentPane(); JButton button = new JButton("Demo Button!"); Border border = BorderFactory.createLineBorder(Color.BLUE); button.setBorder(border); ...
Read MoreJava DatabaseMetaData supportsStoredProcedures() method with example
The supportsStoredProcedures() method of the DatabaseMetaData interface is used to determine whether the underlying database supports stored procedures.This method returns a boolean value which is −True, when the underlying database supports stored procedures.False, when the underlying database doesn't support stored procedures.To determine whether the underlying database supports stored procedures−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 ...
Read MoreWhat happens when you add a double value to a String in java?
The “+” operator with a String acts as a concatenation operator.Whenever you add a String value to a double using the “+” operator, both values are concatenated resulting a String object.In-fact adding a double value to String is the easiest way to convert a double value to Strings.Exampleimport java.util.Scanner; public class StringsExample { public static void main(String args[]){ Scanner sc = new Scanner(System.in); System.out.println("Enter a double value: "); double d = sc.nextDouble(); System.out.println("Enter a String value: "); ...
Read MoreHow to convert File into a Stream in Java?
Let’s say we have a file “input.txt” here in the directory E:/ with the following content:Open a file with Bufferedreader. We have taken the above file here which is located at E: directory;BufferedReader buffReader = Files.newBufferedReader(Paths.get("E:\input.txt"), StandardCharsets.UTF_8);Now get the stream of lines from the above file and display:buffReader.lines().forEach(System.out::println);The following is an example to convert File into a Stream in Java:Exampleimport java.io.BufferedReader; import java.nio.charset.StandardCharsets; import java.nio.file.Files; import java.nio.file.Paths; public class Demo { public static void main(String[] argv) throws Exception { BufferedReader buffReader = Files.newBufferedReader(Paths.get("E:\input.txt"), StandardCharsets.UTF_8); System.out.println("Stream of lines..."); buffReader.lines().forEach(System.out::println); } ...
Read MoreHow to set action command to JButton in Java
With set action command, here we are displaying a message in the console on the click of a button.Set the button first:JButton btn = new JButton("Demo Button");Now, set Action Listener to fire when the button is clicked:ActionListener actionListener = new ActionListener() { public void actionPerformed(ActionEvent event) { String str = event.getActionCommand(); System.out.println("Clicked = " + str); } };The following is an example to set action command to JButton:Exampleimport java.awt.event.ActionEvent; import java.awt.event.ActionListener; import javax.swing.JButton; import javax.swing.JOptionPane; public class SwingDemo { public static void main(final String args[]) { JButton btn ...
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