How to Create a Gradient JTable Headers In Java Netbeans
In this Java Tutorial we will see how to create a JTable with a custom gradient header.
The gradient effect is created by making a custom TableCellRenderer and overriding the paintComponent method to paint a gradient background.
What We Are Gonna Use In This Project:
- Java Programming Language.- NetBeans Editor.
Project Source Code:
package new_tutorials;
import java.awt.Color;
import java.awt.Component;
import java.awt.Dimension;
import java.awt.GradientPaint;
import java.awt.Graphics;
import java.awt.Graphics2D;
import javax.swing.BorderFactory;
import javax.swing.JFrame;
import javax.swing.JLabel;
import javax.swing.JScrollPane;
import javax.swing.JTable;
import javax.swing.SwingConstants;
import javax.swing.table.JTableHeader;
import javax.swing.table.TableCellRenderer;
/**
*
* @author 1BestCsharp
*/
public class TableGradientHeader extends JFrame{
public TableGradientHeader(){
setTitle("Table Gradient Header");
setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
String[] columnNames = {"Column 1","Column 2","Column 3"};
Object[][] data = {
{"Data 1", "Data 2", "Data 3"},
{"Data 4", "Data 5", "Data 6"},
{"Data 1", "Data 2", "Data 3"},
{"Data 4", "Data 5", "Data 6"},
{"Data 1", "Data 2", "Data 3"},
{"Data 4", "Data 5", "Data 6"},
{"Data 1", "Data 2", "Data 3"},
};
JTable table = new JTable(data,columnNames);
JTableHeader header = table.getTableHeader();
header.setPreferredSize(new Dimension(header.getWidth(), 75));
header.setDefaultRenderer(new GradientHeaderRenderer());
JScrollPane scrollPane = new JScrollPane(table);
add(scrollPane);
setSize(400,400);
setLocationRelativeTo(null);
}
public static void main(String[] args) {
TableGradientHeader frame = new TableGradientHeader();
frame.setVisible(true);
}
// Create a custom TableCellRenderer for the table header
class GradientHeaderRenderer extends JLabel implements TableCellRenderer{
/*
private final Color startColor = Color.GREEN;
private final Color endColor = Color.BLACK;
*/
private final Color startColor = Color.CYAN;
private final Color endColor = Color.BLUE;
public GradientHeaderRenderer(){
setHorizontalAlignment(SwingConstants.CENTER);
setForeground(Color.WHITE);
setBorder(BorderFactory.createCompoundBorder(BorderFactory.createMatteBorder(0, 0, 2, 2, Color.GRAY),
BorderFactory.createEmptyBorder(2,5,2,5))
);
}
@Override
public Component getTableCellRendererComponent(JTable table, Object value, boolean isSelected, boolean hasFocus, int row, int column) {
setText(value.toString());
return this;
}
@Override
protected void paintComponent(Graphics g){
// Cast Graphics to Graphics2D for more advanced rendering
Graphics2D g2d = (Graphics2D)g;
int width = getWidth();
int height = getHeight();
// Create a gradient paint for the background
GradientPaint gradientPaint = new GradientPaint(0, 0, startColor,width,0, endColor);
// Set the paint and fill the background with the gradient
g2d.setPaint(gradientPaint);
g2d.fillRect(0, 0, width, height);
// Call the super method to paint the text and other components
super.paintComponent(g);
}
}
}
The Final Result:
.png "JTable With A Gradient Header In Java NetBeans 1")
.png "JTable With A Gradient Header In Java NetBeans 2")
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