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Programming Articles
Page 2471 of 2547
How to change header background color of a table in Java
To change header background color, at first get the header background −JTableHeader tableHeader = table.getTableHeader();Now, set the background color using set Background() −tableHeader.setBackground(Color.black);Above, we have used the Color class to set the color.The following is an example to change the header background color of a JTable −Examplepackage my; import java.awt.Color; import java.awt.Font; import javax.swing.JFrame; import javax.swing.JScrollPane; import javax.swing.JTable; import javax.swing.table.JTableHeader; public class SwingDemo { public static void main(String[] argv) throws Exception { Integer[][] marks = { { 70, 66, 76, 89, 67, 98 }, { 67, 89, 64, ...
Read MoreHow to set magins between cells of a JTable in Java?
To set the margins i.e. row and columns margins between cells of a table, use the setIntercellSpacing() method −Dimension dim = new Dimension(50, 2); table.setIntercellSpacing(new Dimension(dim));Above, we have used the Dimension class −The following is an example to set margins between cells of a JTable cell −Examplepackage my; import java.awt.Dimension; import javax.swing.JFrame; import javax.swing.JPanel; import javax.swing.JRootPane; import javax.swing.JScrollPane; import javax.swing.JTable; import javax.swing.table.DefaultTableModel; public class SwingDemo { public static void main(String[] argv) throws Exception { JFrame frame = new JFrame("Demo"); JPanel panel = new JPanel(); String data[][] = { ...
Read MoreHow to set the initial value of an auto-incremented column in MySQL using JDBC?
While creating a table, in certain scenarios, we need values to column such as ID, to be generated/incremented automatically. Various databases support this feature in different ways.In MySQL database you can declare a column auto increment using the following syntax.CREATE TABLE table_name( ID INT PRIMARY KEY AUTO_INCREMENT, column_name1 data_type1, column_name2 data_type2, column_name3 data_type3, column_name4 data_type4, ............ ........... );While inserting records in a table there is no need to insert value under the auto-incremented column. These will be generated automatically.Setting the initial valueBy default, the initial value of the auto-incremented column will be 1. You ...
Read MoreReturning multiple values from a function using Tuple and Pair in C++
In C or C++, we cannot return more than one value from a function. To return multiple values, we have to provide output parameter with the function. Here we will see another approach to return multiple value from a function using tuple and pair STL in C++.The Tuple is an object capable to hold a collection of elements, where each element can be of different types.The pair can make a set of two values, which may be of different types. The pair is basically a special type of tuple, where only two values are allowed.Let us see one example, where ...
Read MoreHow to disable auto resizing for a JTable in Java?
To disable auto resizing for a table in Java, set the setAutoResizeMode() to AUTO_RESIZE_OFF −JTable table = new JTable(tableModel); table.setAutoResizeMode(JTable.AUTO_RESIZE_OFF);The following is an example to disable auto resizing for a JTable in Java −package my; import java.awt.Dimension; import javax.swing.JFrame; import javax.swing.JPanel; import javax.swing.JRootPane; import javax.swing.JScrollPane; import javax.swing.JTable; import javax.swing.table.DefaultTableModel; public class SwingDemo { public static void main(String[] argv) throws Exception { JFrame frame = new JFrame("Demo"); JPanel panel = new JPanel(); String data[][] = { {"Australia", "5", "1"}, {"US", "10", "2"}, {"Canada", ...
Read MoreJava Program to retrieve the value from a cell in a JTable
To retrieve the value of a cell, use the getValueAt() method. As parameters, set the row and column index value for which you want the cell value −int rIndex = 5; // row index int cIndex = 1; // column index Object ob = table.getValueAt(rIndex, cIndex);Display the cell value in the Console −System.out.println("Value = "+ob);The following is an example to retrieve the value from a cell −Examplepackage my; import java.awt.Dimension; import javax.swing.JFrame; import javax.swing.JPanel; import javax.swing.JRootPane; import javax.swing.JScrollPane; import javax.swing.JTable; import javax.swing.table.DefaultTableModel; public class SwingDemo { public static void main(String[] argv) throws Exception { JFrame frame ...
Read MoreHow to get primary key value (auto-generated keys) from inserted queries using JDBC?
If you insert records into a table which contains auto-incremented column, using a Statement or, PreparedStatement objects.You can retrieve the values of that particular column, generated by them object using the getGeneratedKeys() method.ExampleLet us create a table with name sales in MySQL database, with one of the columns as auto-incremented, using CREATE statement as shown below −CREATE TABLE Sales( ID INT PRIMARY KEY AUTO_INCREMENT, ProductName VARCHAR (20), CustomerName VARCHAR (20), DispatchDate date, DeliveryTime time, Price INT, Location VARCHAR(20) );Retrieving auto-generated values (PreparedStatement object)Following JDBC program inserts 3 records into the Sales table (created above) ...
Read MoreSimulating final class in C++
In Java or C#, we can use final classes. The final classes are special type of class. We cannot extend that class to create another class. In C++ there are no such direct way. Here we will see how to simulate the final class in C++.Here we will create one extra class called MakeFinalClass (its default constructor is private). This function is used to solve our purpose. The main Class MyClass can call the constructor of the MakeFinalClass as they are friend classes.One thing we have to notice, that the MakeFinalClass is also a virtual base class. We will make ...
Read MoreHow to retrieve a record from an existing table in oracle database using JDBC API?
You can update/modify the existing contents of a record in a table using the UPDATE query. Using this you can update all the records of the table or specific records.SyntaxUPDATE table_name SET column1 = value1, column2 = value2...., columnN = valueN WHERE [condition];To update the contents of a record in a table using JDBC API you need to −Register the Driver: Register the driver class using the registerDriver() method of the DriverManager class. Pass the driver class name to it, as parameter.Establish a connection: Connect to the database using the getConnection() method of the DriverManager class. Passing URL (String), username (String), password (String) ...
Read MoreHow to retrieve the value from a table cell with TableModel in Java?
At first, create a table with DefaultTableModel −String data[][] = { {"Australia", "5", "1"}, {"US", "10", "2"}, {"Canada", "9", "3"}, {"India", "7", "4"}, {"Poland", "2", "5"}, {"SriLanka", "5", "6"} }; String col [] = {"Team", "Selected Players", "Rank"}; DefaultTableModel tableModel = new DefaultTableModel(data, col); JTable table = new JTable(tableModel);Now, use the getModel() to retrieve the value from table cell −Object ob = table.getModel().getValueAt(3, 2); System.out.println("Value = "+ob);The following is an example to retrieve the value from a table cell with TableModel −Examplepackage my; import java.awt.Dimension; import javax.swing.JFrame; import javax.swing.JPanel; import javax.swing.JRootPane; import javax.swing.JScrollPane; import ...
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