Article Categories
- All Categories
-
Data Structure
-
Networking
-
RDBMS
-
Operating System
-
Java
-
MS Excel
-
iOS
-
HTML
-
CSS
-
Android
-
Python
-
C Programming
-
C++
-
C#
-
MongoDB
-
MySQL
-
Javascript
-
PHP
-
Economics & Finance
Programming Articles
Page 2462 of 2547
Java Program to set minor tick marks in a JSlider every 10 units
Minor Tick marks is the number passed in representing the distance between each minor tick mark. For example, a slider with range from 0 to 70 and minor tick spacing 10, would give minor ticks next to the following values: 0, 10, 20, 30, 40, 50, 60, 70.To set minor tick marks, use the setMinorTickSpacing() method −JSlider slider = new JSlider(JSlider.HORIZONTAL, 0, 100, 60); slider.setMinorTickSpacing(10);Note − For minor ticks to be painted, you need to set setPaintTicks to true.The following is an example to set minor tick marks in a slider every 10 units −Examplepackage my; import javax.swing.JFrame; import javax.swing.JPanel; ...
Read MoreGet the path of the file selected in the JFileChooser component with Java
To get the path of the selected file, at first get the selected file −java.io.File f = file.getSelectedFile();Now, get the path of the selected file which we will get using the above method −System.err.println(f.getPath());The following is an example to get the path of the file selected in the JFileChooser component −Examplepackage my; import javax.swing.JFileChooser; public class SwingDemo { public static void main(String[] args) { JFileChooser file = new JFileChooser(); file.setMultiSelectionEnabled(true); file.setFileSelectionMode(JFileChooser.FILES_AND_DIRECTORIES); file.setFileHidingEnabled(false); if (file.showOpenDialog(null) == JFileChooser.APPROVE_OPTION) { java.io.File f = ...
Read MoreExplain widening with objects in Java.
Java provides various datatypes to store various data values. It provides 7 primitive datatypes (stores single values) namely, boolean, byte, char, short, int, long, float, double and, reference datatypes (arrays and objects).Type Casting/type conversion − Converting one primitive datatype into another is known as type casting (type conversion) in Java. You can cast the primitive datatypes in two ways namely, Widening and, Narrowing.Widening − Converting a lower datatype to a higher datatype is known as widening. In this case the casting/conversion is done automatically therefore, it is known as implicit type casting. In this case both datatypes should be compatible ...
Read MoreCan we set JOptionPane with predefined selection in Java?
For predefined selection, use the setSelectedIndex() method, wherein you need to set the index of the item you want to be visible first.Let’s say the following is our aComboBox with elements −Object[] sports = { "Football", "Cricket", "Squash", "Baseball", "Fencing", "Volleyball", "Basketball" }; JComboBox comboBox = new JComboBox(sports);Now, set the initial selection with the index of the item −comboBox.setSelectedIndex(3);The following is an example to set JOptionPane with predefined selection in Java −Examplepackage my; import java.awt.GridBagLayout; import javax.swing.JComboBox; import javax.swing.JOptionPane; import javax.swing.JPanel; public class SwingDemo { public static void main(String[] args) throws Exception { JPanel panel = ...
Read MoreProper stack and heap usage in C++?
The stack − All variables declared inside the function will take up memory from the stack. So, any local variable inside a function lives on the stack.The heap − This is unused memory of the program and can be used to allocate the memory dynamically when program runs. So If we want something to live longer than the function that declared it, we must allocate it on the heap.Exampleint main() { int a; //get memory allocated on stack. int *ptr=new int[7]; //memory for 7 integers allocated on heap. }The main issue in heap memory is fragmentation whereas memory ...
Read MoreExplain narrowing with object in Java.
Java provides various datatypes to store various data values. It provides 7 primitive datatypes (stores single values) namely, boolean, byte, char, short, int, long, float, double and, reference datatypes (arrays and objects).Type Casting/type conversion −Converting one primitive datatype into another is known as type casting (type conversion) in Java. You can cast the primitive datatypes in two ways namely, Widening and, Narrowing.Narrowing − Converting a higher datatype to a lower datatype is known as narrowing. In this case the casting/conversion is not done automatically, you need to convert explicitly using the cast operator “( )” explicitly. Therefore, it is known ...
Read MoreHow to add JList to Scroll pane in Java?
To add JList to Scroll pane in Java, use JScrollPane:JList list = new JList(sports); JScrollPane scrollPane = new JScrollPane(list);After that set it to Container:Container contentPane = frame.getContentPane(); contentPane.add(scrollPane, BorderLayout.CENTER);The following is an example to add JList to Scroll pane:Examplepackage my; import java.awt.event.*; import java.awt.*; import javax.swing.*; class SwingDemo extends JFrame { static JFrame frame; static JList list; public static void main(String[] args) { frame = new JFrame("JList Demo"); frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE); String sports[]= {"Tennis", "Archery", "Football", "Fencing", "Cricket", "Squash", "Hockey", "Rugby"}; list = new JList(sports); ...
Read MoreHow to include libraries in Visual Studio 2012?
To add libraries in Visual Studio 2012, there are two different methods. The first one is manual method. The second one is adding libraries from code.Let us see the manual method first.To add some library, we have to follow these five steps −Add the #include statements necessary files with proper declarations. For example −#include “library.h”Add the include directory for the compiler look up;Go to the Configuration Properties/VC++ Directories/Include DirectoriesThen click and edit, and add new entryAdd one library directory for *.lib files:Go to project (on top bar) -> properties -> Configuration Properties -> VC++ Directories -> Library Directories, then click ...
Read MoreJava Connection getNumeric() method with example
The getNumeric() method of the Connection interface retrieves the list of math functions supported by the current database. The names returned by this method are the Open CLI math function names.This method returns a String value holding the list of functions separated by commas (", ").To get the list of the numeric functions supported by 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 ...
Read MoreSet whether the column in the table model can be selected or deselected in Java?
We can set or disallow selection of column in the table using setColumnSelectionAllowed().Let’s say the following is our table −DefaultTableModel tableModel = new DefaultTableModel(); JTable table = new JTable(tableModel);If you want to allow selection of column, then set the method to TRUE −table.setColumnSelectionAllowed(true);If you want to disallow selection of column, then set the method to FALSE −table.setRowSelectionAllowed(false);Here, in the below example we have disallowed selection of columns −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 More