Carey Brown

Glad I could be of help.

import java.util.Arrays; import java.util.Comparator; import java.util.List; // Ascending & Descending public class Tmp4 { static List<Integer> listasc = Arrays.asList(4,3,8,1,5,2); static List<Integer> listdsc = Arrays.asList(4,3,8,1,5,2); static Comparator<Integer> asc =  (a,b) -> a - b; static Comparator<Integer> dsc =  (a,b) -> b - a; static void main( String[] args ) { listasc.sort(asc); System.out.println( listasc ); listdsc.sort(dsc); System.out.println( listdsc ); } }

Mike Simmons wrote:(Though both of those have bugs in general, they work fine for this problem.)

Yes, overflow/underflow issues.

// DESCENDING (o1, o2) -> o2 - o1 // ASCENDING (o1,o2) -> o1 - o2

@SuppressWarnings("serial") class DataIsBoldRenderer extends DefaultTableCellRenderer {    public Component getTableCellRendererComponent( JTable table, Object value,            boolean isSelected, boolean hasFocus, int row, int column )    {        JLabel comp = (JLabel)super.getTableCellRendererComponent( table, value,                isSelected, hasFocus, row, column );        if( comp.getText().endsWith( " Weapons" ) ) // *** THIS            comp.setFont( comp.getFont().deriveFont( Font.BOLD ) );        else            comp.setFont( comp.getFont().deriveFont( Font.PLAIN ) );        return comp;    } }

Looking at your data you can turn bolding on if the text.endsWith( " weapons" );

Here's a way to do it, not by row-col, but by making a Data object with a boolean flag to determine if it will be displayed in bold.
import java.awt.Component; import java.awt.Font; import java.util.Random; import javax.swing.JFrame; import javax.swing.JLabel; import javax.swing.JScrollPane; import javax.swing.JTable; import javax.swing.table.DefaultTableCellRenderer; import javax.swing.table.DefaultTableModel; public class SwingRendererBoldFlag { public static final Random RAND = new Random(); public static final int COL_CLOSE_TIME = 0; public static final Object[] cols = { "Close Time" }; public static void main( String[] args ) { new SwingRendererBoldFlag().run(); } void run() { JFrame frame = new JFrame( "SwingRenderBoldFlag" ); frame.setDefaultCloseOperation( JFrame.EXIT_ON_CLOSE ); frame.setSize( 400, 400 ); frame.setLocationRelativeTo( null ); DefaultTableModel model = new DefaultTableModel(); model.setColumnIdentifiers( cols ); JTable table = new JTable(); table.setModel( model ); table.getColumnModel().getColumn( COL_CLOSE_TIME ) .setCellRenderer( new DataIsBoldRenderer() ); Object[][] data = getData(); for( int i = 0 ; i < data.length ; i++ ) model.addRow( data[i] ); JScrollPane pane = new JScrollPane( table ); frame.add( pane ); frame.setVisible( true ); } static final Random rand = new Random(); static Object[][] getData() { Object[][] data; data = new Object[20][]; for( int r = 0 ; r < data.length ; r++ ) { data[r] = new Object[1]; data[r][0] = new DataIsBold( ""+r, rand.nextBoolean() ); } return data; } static int rand( int min, int max ) { return RAND.nextInt( max - min ) + min; } } class DataIsBold { String text; boolean isBold; public DataIsBold( String text, boolean isBold ) { this.text = text; this.isBold = isBold; } public boolean isBold() { return isBold; } public void setBold( boolean b ) { isBold = b; } public String toString() { return text; } } @SuppressWarnings("serial") class DataIsBoldRenderer extends DefaultTableCellRenderer { public Component getTableCellRendererComponent( JTable table, Object value, boolean isSelected, boolean hasFocus, int row, int column ) { JLabel comp = (JLabel)super.getTableCellRendererComponent( table, value, isSelected, hasFocus, row, column ); if( ((DataIsBold)value).isBold() ) comp.setFont( comp.getFont().deriveFont( Font.BOLD ) ); else comp.setFont( comp.getFont().deriveFont( Font.PLAIN ) ); return comp; } }

First off, is there something in the data itself that can be a cue to making it bold? For example, some tables with financial amounts may want to display negative values in bold.

See if this helps. ChatGPT-4o

To set a particular cell in a JTable to use a bold font in Java Swing, you need to customize the cell renderer for that cell. The TableCellRenderer interface allows you to define how a cell is displayed, and you can override the default renderer to apply custom styling, such as making the font bold.

Here's a complete example of how you can achieve this:

   Create a custom TableCellRenderer.
   Apply the custom renderer to the specific cell.

Here's the code:
import javax.swing.*; import javax.swing.table.DefaultTableCellRenderer; import javax.swing.table.DefaultTableModel; import java.awt.*; public class BoldCellTableExample {    public static void main(String[] args) {        SwingUtilities.invokeLater(() -> createAndShowGUI());    }    private static void createAndShowGUI() {        JFrame frame = new JFrame("Bold Cell Example");        frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);        frame.setSize(400, 300);        // Sample data        Object[][] data = {                {"Row1-Column1", "Row1-Column2"},                {"Row2-Column1", "Row2-Column2"}        };        // Column names        String[] columnNames = {"Column 1", "Column 2"};        // Create a table model        DefaultTableModel model = new DefaultTableModel(data, columnNames);        // Create the table        JTable table = new JTable(model);        // Set custom renderer for a specific cell        int boldRow = 1; // row index (0-based)        int boldCol = 0; // column index (0-based)        table.getColumnModel().getColumn(boldCol).setCellRenderer(new BoldCellRenderer(boldRow, boldCol));        // Add the table to a scroll pane and add it to the frame        frame.add(new JScrollPane(table));        // Display the window        frame.setVisible(true);    }    static class BoldCellRenderer extends DefaultTableCellRenderer {        private final int rowToBold;        private final int colToBold;        public BoldCellRenderer(int rowToBold, int colToBold) {            this.rowToBold = rowToBold;            this.colToBold = colToBold;        }        @Override        public Component getTableCellRendererComponent(JTable table, Object value, boolean isSelected,                                                       boolean hasFocus, int row, int column) {            Component cellComponent = super.getTableCellRendererComponent(table, value, isSelected, hasFocus, row, column);            if (row == rowToBold && column == colToBold) {                cellComponent.setFont(cellComponent.getFont().deriveFont(Font.BOLD));            } else {                cellComponent.setFont(cellComponent.getFont().deriveFont(Font.PLAIN));            }            return cellComponent;        }    } }
Explanation

   Custom Renderer Class: The BoldCellRenderer class extends DefaultTableCellRenderer. It takes two parameters in the constructor: the row and column indices of the cell that should be bold.

   Override getTableCellRendererComponent Method: This method is overridden to customize the rendering of the cell. It checks if the current cell is the one that needs to be bold and sets the font accordingly.

   Set Renderer on Column: In the createAndShowGUI method, the custom renderer is set on the column of the table that contains the cell to be bolded.

   Table Setup: The table is created with sample data and added to a JFrame for display.

By following this pattern, you can set specific cells in a JTable to use a bold font or apply other custom styles as needed.

Also, unless you are resetting the size of the 'data' list inside the loop, the loop will keep appending to data and what it writes out will get longer and longer.

   private static void writeToFile(java.util.List lists, String path) {    // should be    private static void writeToFile( List<String> lists, String path) {

Java-8 dates back to 2014. Try something newer.

Mike Simmons wrote:If they ever use 0 for 1900s, or 2 for 2100s, then one approach would be to take that original format as a decimal number, and add 19000000.

So 1240528 + 19000000 = 20240528.  Convert that back to a String and parse it using yyyyMMdd.  That way you can easily handle any date from 1900 on to... whenever, really.

Yes. I'm  asking "IF?".

Steve Dyke wrote:1240528 is a real field value.

Rob M. was correct 1 = 20XX
24 = year
05 = Month
28 = Day

Do you ever have the case where the '1' is missing or replaced by a different digit?

The loop has already been written for you and  is inside the constructor:
DefaultTableModel model = new DefaultTableModel( armor, columnNames );