test.java

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import java.awt.*;
import java.awt.event.*;
import javax.swing.*;
import javax.swing.table.*;
import java.util.*;

public class Test extends JFrame {
	Object[] columnNames = 
			 {"First Name", "MI", "Last Name"};

	Object[][] names = {
		{ "Lynn", "M.", "Seckinger" },
		{ "Carol", "R.", "Seckinger" },
		{ "Roy", "D.", "Martin" },
		{ "Bill", "O.", "Veryveryveryverylonglastname" },
		{ "Richard", "A.", "Tattersall" },
		{ "Philip", "B.", "Edwards" },
		{ "Moore", "T.", "Moore" },

		// shorten scrollbar grip with these ...
		{ "Lynn", "M.", "Seckinger" },
		{ "Carol", "R.", "Seckinger" },
		{ "Roy", "D.", "Martin" },
		{ "Bill", "O.", "Veryveryveryverylonglastname" },
		{ "Richard", "A.", "Tattersall" },
		{ "Philip", "B.", "Edwards" },
		{ "Moore", "T.", "Moore" },
	};
	JTable table = new JTable(names, columnNames);

	public Test() {
		TableColumn mid = table.getColumn(columnNames[1]);
		TableColumn last = table.getColumn(columnNames[2]);

		int midWidth = getPreferredWidthForColumn(mid),
		    lastWidth = getPreferredWidthForColumn(last);

		mid.setMinWidth(midWidth);
		mid.setMaxWidth(midWidth);

		last.setMinWidth(lastWidth);

		// sizeColumnsToFit() must be called due to a JTable
		// bug ...
		table.sizeColumnsToFit(0);

		getContentPane().add(new JScrollPane(table), 
							 BorderLayout.CENTER);
	}
	public int getPreferredWidthForColumn(TableColumn col) {
		int hw = columnHeaderWidth(col),   // hw = header width
			cw = widestCellInColumn(col);  // cw = column width

		return hw > cw ? hw : cw;
	}
	private int columnHeaderWidth(TableColumn col) {
		TableCellRenderer renderer = col.getHeaderRenderer();

		Component comp = renderer.getTableCellRendererComponent(
						  			table, col.getHeaderValue(), 
						  			false, false, 0, 0);

		return comp.getPreferredSize().width;
	}
	private int widestCellInColumn(TableColumn col) {
		int c = col.getModelIndex(), width=0, maxw=0;

		for(int r=0; r < table.getRowCount(); ++r) {
			TableCellRenderer renderer = 
							  table.getCellRenderer(r,c);

			Component comp = 
				renderer.getTableCellRendererComponent(
						  			table, table.getValueAt(r,c), 
						  			false, false, r, c);

			width = comp.getPreferredSize().width;
			maxw = width > maxw ? width : maxw;
		}
		return maxw;
	}
	public static void main(String args[]) {
		GJApp.launch(
			new Test(),"Setting Column Widths",300,300,320,140);
	}
}
class GJApp extends WindowAdapter {
	static private JPanel statusArea = new JPanel();
	static private JLabel status = new JLabel(" ");
	static private ResourceBundle resources;

	public static void launch(final JFrame f, String title,
							  final int x, final int y, 
							  final int w, int h) {
		launch(f,title,x,y,w,h,null);	
	}
	public static void launch(final JFrame f, String title,
							  final int x, final int y, 
							  final int w, int h,
							  String propertiesFilename) {
		f.setTitle(title);
		f.setBounds(x,y,w,h);
		f.setVisible(true);

		statusArea.setBorder(BorderFactory.createEtchedBorder());
		statusArea.setLayout(new FlowLayout(FlowLayout.LEFT,0,0));
		statusArea.add(status);
		status.setHorizontalAlignment(JLabel.LEFT);

		f.setDefaultCloseOperation(
							WindowConstants.DISPOSE_ON_CLOSE);

		if(propertiesFilename != null) {
			resources = ResourceBundle.getBundle(
						propertiesFilename, Locale.getDefault());
		}

		f.addWindowListener(new WindowAdapter() {
			public void windowClosed(WindowEvent e) {
				System.exit(0);
			}
		});
	}
	static public JPanel getStatusArea() {
		return statusArea;
	}
	static public void showStatus(String s) {
		status.setText(s);
	}
	static Object getResource(String key) {
		if(resources != null) {
			return resources.getString(key);
		}
		return null;
	}
}