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A JTable is a subclass of JComponent for displaying complex data structures. A JTable component can follow the Model View Controller (MVC) design pattern for displaying the data in rows and columns. A JTable can generate TableModelListener, TableColumnModelListener, ListSelectionListener, CellEditorListener, RowSorterListener interfaces. We can implement the search functionality of a JTable by input a string in the JTextField, it can search for a string available in a JTable. If the string matches it can only display the corresponding value in a JTable. We can use the DocumentListener interface of a JTextField to implement it.Exampleimport java.awt.*; import javax.swing.*; import javax.swing.event.*; import javax.swing.table.*; public ... Read More
In this tutorial, we will be discussing a program to find the number of pairs of an array which differ in K bits.For this we will be provided with an array and an integer K. Our task is to find the number of pairs who differ by K bits in their binary representation.Example#include using namespace std; //counting number of bits in //binary representation int count_bit(int n){ int count = 0; while (n) { if (n & 1) ++count; n >>= 1; } return count; } ... Read More
Following are the steps to use native methods.Create a header file (.h file) for a CPP program.Create CPP fileCreate a DLLIn java code, declare the method as native, load the DLL using System.loadLibrary() method and call the method.
In this tutorial, we will be discussing a program to find the number of pairs of adjacent nodes whose XOR is an odd number.For this we will be provided with a binary tree. Our task is to count the number of pairs of adjacent elements whose XOR is an odd number.Example Live Demo#include using namespace std; //node structure of tree struct Node { int data; struct Node *left, *right; }; //finding the pairs whose XOR //is odd int count_pair(Node* root, Node *parent=NULL){ if (root == NULL) return 0; //checking pair of XOR is ... Read More
Here is an example in which a simple Python object is wrapped and embedded. We are using .c for this, c++ has similar steps −class PyClass(object): def __init__(self): self.data = [] def add(self, val): self.data.append(val) def __str__(self): return "Data: " + str(self.data) cdef public object createPyClass(): return PyClass() cdef public void addData(object p, int val): p.add(val) cdef public char* printCls(object p): return bytes(str(p), encoding = 'utf-8')We compile with cython pycls.pyx (use --cplus for c++) to generate ... Read More
A JSlider is a subclass of JComponent class and it is similar to scroll bar which allows the user to select a numeric value from a specified range of integer values. It has a knob which can slide on a range of values and can be used to select a particular value. A JSlider can generate a ChangeListener interface and the important methods of JSlider are getMaximum(), getMinimum(), getOrientation(), getValue() and setValue(). The default position of a JSlider is horizontal and we can also set the position to vertical programmatically by selecting a menu item from a menu bar. It can generate an ActionListener interface ... Read More
Having entered following command from linux terminal −$ g++ helloworld.cppThe a.out file should be created in the current working directory if the compilation is successful. Check if a.out is created.To execute enter following from command line −$ ./a.outIn most cases, output of your source program is displayed. However, as in your case, error message indicating a.out is not executable is appearing. See the properties of a.out and make it executable (if not already) by following command −$ chmod +x a.outYou may require sudo privilege for this. In all probability this should work. all the bestRead More
A JTableHeader is a subclass of JComponent class, When we create a JTable object, the constructor creates a new JTableHeader object to manage the table component's header. A JTable supplies a setTableHeader() method that establishes the table header component's JTableHeader object and a getTableHeader() method that returns a reference to the table header component's JTableHeader object. We can set a tooltip text to each column of a JTableHeader by overriding the getToolTipText() method of JTableHeader class.Exampleimport java.awt.*; import java.awt.event.*; import javax.swing.*; import javax.swing.table.*; public class JTableHeaderToolTipTest extends JPanel { private DefaultTableModel dmodel; private JTable table; private JScrollPane jsp; public JTableHeaderToolTipTest() ... Read More
A JTextArea is a subclass of JTextComponent class and it is a multi-line text component to display the text or allow a user to enter the text. A JTextArea can generate a CaretListener interface when we are trying to implement the functionality of the JTextArea. By default, a JTextarea allows the orientation from left to right, if the user wants to enter a text from right to left by using the setComponentOrientation(ComponentOrientation.RIGHT_TO_LEFT) method of JTextArea class.Exampleimport java.awt.*; import javax.swing.event.*; import javax.swing.*; public class JTextAreaOrientationTest extends JFrame { private JTextArea textArea; public JTextAreaOrientationTest() { setTitle("JTextAreaOrientation Test"); textArea = new ... Read More
Combining of functions in MySQL is quite possible by providing a function as the argument of other function. It is also called nesting of functions. To understand it, consider some examples belowmysql> Select UPPER(CONCAT('www.', 'tutorialspoint', '.com'))As Tutorials; +------------------------+ | Tutorials | +------------------------+ | WWW.TUTORIALSPOINT.COM | +------------------------+ 1 row in set (0.00 sec) mysql> Select LOWER(CONCAT('WWW.', 'TUTORIALSPOINT', '.COM'))As Tutorials; +------------------------+ | Tutorials | +------------------------+ | www.tutorialspoint.com | +------------------------+ 1 row in set (0.00 sec)The above queries combine UPPER() and LOWER() function with CONCAT() function.Similarly, we can combine more ... Read More