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Articles by Samual Sam
Page 130 of 151
How to execute a command and get output of command within C++ using POSIX?
Here we will see how to use the POSIX command through C++. The process is very simple, we have to use the function called system(). Inside this we have to pass string. That string will contain the POSIX command. The syntax is like below.system(“command”)Example#include using namespace std; int main () { cout
Read MoreHow to create FileFilter for JFileChooser in Java and display File Type accordingly?
To create FileFilter, use the FileNamExtensionFilter class. The following is an example to display File Type in JFileChooser −Exampleimport javax.swing.JFileChooser; import javax.swing.filechooser.FileNameExtensionFilter; public class SwingDemo { public static void main(String[] args) { JFileChooser file = new JFileChooser(); file.setAcceptAllFileFilterUsed(false); FileNameExtensionFilter extFilter = new FileNameExtensionFilter("JPEG file", "jpg", "jpeg"); file.addChoosableFileFilter(extFilter); file.showOpenDialog(null); } }Output
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 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 make the program sleep for x milliseconds in C++?
Here we will see how to sleep for x (given by user) milliseconds in C++ program.To do this thing we can use different libraries. But here we are using the clock() function. The clock() will return the current CPU time. Here we will try to find the ending time from the clock, and the given x value. Then for that amount of time, we will run one blank while loop to take the time. Here one macro is used called CLOCKS_PER_SEC, this finds the number of clock ticks per second.Let us see the code to get the better idea about ...
Read MoreHow to add background Image to JFrame in Java
To add background image to JFrame, use the getImage() method of the Image class −Image img = Toolkit.getDefaultToolkit().getImage("E:\rahul.jpg");Now, draw the image −public void paintComponent(Graphics g) { super.paintComponent(g); g.drawImage(img, 0, 0, null); }The following is an example to add Background Image to JFrame −Exampleimport java.awt.Graphics; import java.awt.Image; import java.awt.Toolkit; import java.io.IOException; import javax.swing.JPanel; public class SwingDemo extends javax.swing.JFrame { Image img = Toolkit.getDefaultToolkit().getImage("E:\rahul.jpg"); public SwingDemo() throws IOException { this.setContentPane(new JPanel() { @Override public void paintComponent(Graphics g) { super.paintComponent(g); ...
Read MoreHow to select the second index in Java JList?
To select the second index, use the setSelectedIndex() method −JList new JList(sports); list.setSelectedIndex(2);The following is an example to select the second index in Java JList −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"); SwingDemo s = new SwingDemo(); JPanel panel = new JPanel(); String sports[]= { "Cricket","Football","Hockey","Rugby"}; list = new JList(sports); list.setSelectedIndex(2); panel.add(list); frame.add(panel); frame.setSize(400,400); frame.setVisible(true); } }Output
Read MoreGet JFrame window size information in Java
To get JFrame window size information, you can use the following −environment.getMaximumWindowBounds();For Screen Size −config.getBounds()For Frame Size −frame.getSize());The following is an example to get JFrame window size information −Exampleimport java.awt.GraphicsConfiguration; import java.awt.GraphicsDevice; import java.awt.GraphicsEnvironment; import java.awt.Rectangle; import javax.swing.JFrame; public class SwingDemo { public static void main(String[] args) { GraphicsEnvironment environment = GraphicsEnvironment.getLocalGraphicsEnvironment(); Rectangle bounds = environment.getMaximumWindowBounds(); System.out.println("Screen Bounds = " + bounds); GraphicsDevice device = environment.getDefaultScreenDevice(); GraphicsConfiguration config = device.getDefaultConfiguration(); System.out.println("Screen Size = " + config.getBounds()); JFrame frame ...
Read MoreHow to set default button for JFrame in Java?
To set default button for JFrame, use the setDefaultButton() method −JFrame frame = new JFrame(); frame.getRootPane().setDefaultButton(button);The following is an example to set default button for JFrame −Exampleimport java.awt.event.ActionEvent; import java.awt.event.ActionListener; import java.awt.event.KeyEvent; import javax.swing.JButton; import javax.swing.JFrame; public class SwingDemo { public static void main(String args[]) { JButton button = new JButton("Demo Button!"); JFrame frame = new JFrame(); frame.setSize(500, 300); frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE); frame.getRootPane().setDefaultButton(button); button.setMnemonic(KeyEvent.VK_A); button.addActionListener(new ActionListener() { public void actionPerformed(ActionEvent ae) { ...
Read MoreDraw a border around an undecorated JFrame in Java
At first, set an undecorated frame −setUndecorated(true);Now draw a border −getRootPane().setBorder (.createMatteBorder(3, 3, 3, 3, Color.ORANGE));The following is an example to draw a border around an undecorated JFrame −Exampleimport java.awt.BorderLayout; import java.awt.Color; import java.awt.Dimension; import javax.swing.BorderFactory; import javax.swing.JFrame; import javax.swing.JLabel; public class SwingDemo extends JFrame { JLabel label = new JLabel("Welcome!", JLabel.CENTER); public SwingDemo() { setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE); setSize(new Dimension(500, 300)); add(label, BorderLayout.CENTER); setUndecorated(true); getRootPane().setBorder( BorderFactory.createMatteBorder(3, 3, 3, 3, Color.ORANGE)); setVisible(true); } public static void main(String[] args) { new SwingDemo(); } }Output
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