EDIT Shows example of how to color cells based on the time, if time remaining is less or equal to five minutes, the cell becomes red.
First, you need to create a custom renderer class, which will be used by your table. This class will contain the logic for coloring of cells, eighter red, or default white:
static class CustomRenderer extends DefaultTableCellRenderer {
@SuppressWarnings("compatibility:-3065188367147843914")
private static final long serialVersionUID = 1L;
@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); //get the current cell component
//get the time as String from the current cell at position (row,column)
//if the string value of time is less than the string representing 5 minutes color it red, else white.
//Because of lexicographic alphabet sorting, we can compare the strings correctly like this
String time = (String) table.getValueAt(row, column);
if (time!=null && time.compareTo("00:05:00") <= 0) {
cellComponent.setBackground(Color.RED);
} else {
cellComponent.setBackground(Color.WHITE);
}
return cellComponent;
}
}
Next, you need to tell your table to use this new custom renderer:
tableModel = new DefaultTableModel(rowData, columnNames);
table = new JTable(tableModel);
int columnCount = table.getColumnModel().getColumnCount(); //get number of columns
//for each column apply the custom rendered
for (int i = 0; i < columnCount; i++) {
table.getColumnModel().getColumn(i).setCellRenderer(new CustomRenderer());
}
And that's it! Now the cells will be red or not depending on the time.
I edited the original answer with this modification, you can test and run the code below:
Adapt this to your needs.
import java.awt.BorderLayout;
import java.awt.Color;
import java.awt.Component;
import java.awt.event.WindowAdapter;
import java.awt.event.WindowEvent;
import javax.swing.JFrame;
import javax.swing.JPanel;
import javax.swing.JScrollPane;
import javax.swing.JTable;
import javax.swing.SwingUtilities;
import javax.swing.table.DefaultTableCellRenderer;
import javax.swing.table.DefaultTableModel;
public class Timer {
static class CustomRenderer extends DefaultTableCellRenderer {
@SuppressWarnings("compatibility:-3065188367147843914")
private static final long serialVersionUID = 1L;
@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);
String time = (String) table.getValueAt(row, column);
if (time!=null && time.compareTo("00:05:00") <= 0) {
cellComponent.setBackground(Color.RED);
} else {
cellComponent.setBackground(Color.WHITE);
}
return cellComponent;
}
}
class PassTime extends Thread {
private int initialSeconds;
private final int row;
private final int column;
public PassTime(int row, int column, int initialSeconds) {
this.initialSeconds = initialSeconds;
this.row = row;
this.column = column;
}
@Override
@SuppressWarnings("SleepWhileInLoop")
public void run() {
while (initialSeconds >= 0) { //while we can countdown
try {
//set the new value in the row/column position in the matrix
((DefaultTableModel) table.getModel()).setValueAt(getTime(initialSeconds), row, column);
//let the table know it's data has been modified
((DefaultTableModel) table.getModel()).fireTableDataChanged();
Thread.sleep(1000); //wait 1 second
initialSeconds--; //decrement seconds by 1
} catch (InterruptedException e) {
System.out.println(e.getMessage());
}
}
}
}
public void PassTheTime(int row, int column, int time) {
PassTime timer = new PassTime(row, column, time);
timer.start();
}
static Object[] columnNames = new Object[]{"Time 1", "Time 2"}; //table header
static String[][] rowData = new String[2][2]; //only a 2 by 2 matrix in this example
private final JPanel mainPanel = new JPanel();
private final DefaultTableModel tableModel;
private final JTable table;
//method to get time from seconds as hh:mm:ss
public static String getTime(int totalSecs) {
int hours = totalSecs / 3600;
int minutes = (totalSecs % 3600) / 60;
int seconds = totalSecs % 60;
String timeString = String.format("%02d:%02d:%02d", hours, minutes, seconds);
return timeString;
}
public Timer() {
tableModel = new DefaultTableModel(rowData, columnNames);
table = new JTable(tableModel);
int columnCount = table.getColumnModel().getColumnCount();
for (int i = 0; i < columnCount; i++) {
table.getColumnModel().getColumn(i).setCellRenderer(new CustomRenderer());
}
mainPanel.setLayout(new BorderLayout());
mainPanel.add(new JScrollPane(table), BorderLayout.CENTER);
}
public JPanel getMainPanel() {
return mainPanel;
}
private static void createAndShowGui() {
final Timer timer = new Timer();
JFrame frame = new JFrame("Timer");
frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
frame.getContentPane().add(timer.getMainPanel());
frame.pack();
frame.setSize(200, 200);
frame.setLocationByPlatform(true);
frame.setVisible(true);
frame.addWindowListener(new WindowAdapter() {
@Override
public void windowOpened(WindowEvent e) {
//start each timer
//pass row,column position in the matrix for each Time and the seconds value
timer.PassTheTime(0, 0, 302);
timer.PassTheTime(0, 1, 320);
timer.PassTheTime(1, 0, 310);
timer.PassTheTime(1, 1, 420);
}
});
}
public static void main(String[] args) {
SwingUtilities.invokeLater(new Runnable() {
@Override
public void run() {
createAndShowGui();
}
});
}
}
