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How can we implement the word wrap JTableHeader of a JTable in Java?
JTableHeader
- 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.
- The JTableHeader object associated with the table component's column model so that its UI delegate can drag the columns and render each column's header cell.
- 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 implement the word-wrap table header of a JTable by customizing the DefaultTableModel class or AbstractTableModel class.
Example
import java.util.*;
import javax.swing.*;
import javax.swing.table.*;
public class WordWrappingTableHeaderTest extends JFrame {
private JTable table;
public WordWrappingTableHeaderTest() {
setTitle("WordWrappingTableHeader Test");
DefaultTableColumnModel tableColumnModel = new DefaultTableColumnModel() {
public void addColumn(TableColumn column) {
column.setHeaderRenderer(new JTableHeader().getDefaultRenderer());
super.addColumn(column);
}
};
table = new JTable();
table.setFillsViewportHeight(true);
table.setColumnModel(tableColumnModel);
table.setModel(new DemoTableModel(Arrays.asList("Word Wrapping TableHeader Test", "Word Wrapping TableHeader Test", "Word Wrapping TableHeader Test"), 20));
add(new JScrollPane(table));
setSize(450, 300);
setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
setResizable(false);
setLocationRelativeTo(null);
setVisible(true);
}
class DemoTableModel extends AbstractTableModel {
private ArrayList wrappedColumnNames = new ArrayList();
private int numRows;
DemoTableModel(List columnNames, int numRows) {
for (String name: columnNames)
wrappedColumnNames.add("" + name + "");
this.numRows = numRows;
}
public int getRowCount() {
return numRows;
}
public int getColumnCount() {
return wrappedColumnNames.size();
}
public Object getValueAt(int rowIndex, int columnIndex) {
return Integer.valueOf(10000 + (rowIndex + 1)*(columnIndex + 1));
}
public String getColumnName(int column) {
return wrappedColumnNames.get(column);
}
public Class getColumnClass(int columnIndex) {
return Integer.class;
}
}
public static void main(String[] args) {
new WordWrappingTableHeaderTest();
}
}Output
Updated on: 11-Feb-2020
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