+ class MyDesktopPane extends JDesktopPane implements Runnable
+ {
+ boolean showMemoryUsage = false;
+ Runtime runtime;
+ java.text.NumberFormat df;
+
+ float maxMemory, allocatedMemory, freeMemory, totalFreeMemory, percentUsage;
+
+ public MyDesktopPane(boolean showMemoryUsage)
+ {
+ showMemoryUsage(showMemoryUsage);
+ }
+
+ public void showMemoryUsage(boolean showMemoryUsage)
+ {
+ this.showMemoryUsage = showMemoryUsage;
+ if (showMemoryUsage)
+ {
+ Thread worker = new Thread(this);
+ worker.start();
+ }
+ }
+
+ public void run()
+ {
+ df = java.text.NumberFormat.getNumberInstance();
+ df.setMaximumFractionDigits(2);
+ runtime = Runtime.getRuntime();
+
+ while (showMemoryUsage)
+ {
+ try
+ {
+ Thread.sleep(3000);
+ maxMemory = runtime.maxMemory() / 1048576f;
+ allocatedMemory = runtime.totalMemory() / 1048576f;
+ freeMemory = runtime.freeMemory() / 1048576f;
+ totalFreeMemory = freeMemory + (maxMemory - allocatedMemory);
+
+ percentUsage = (totalFreeMemory / maxMemory) * 100;
+
+ // if (percentUsage < 20)
+ {
+ // border1 = BorderFactory.createMatteBorder(12, 12, 12, 12, Color.red);
+ // instance.set.setBorder(border1);
+ }
+ repaint();
+
+ }
+ catch (Exception ex)
+ {
+ ex.printStackTrace();
+ }
+ }
+ }
+
+ public void paintComponent(Graphics g)
+ {
+ if(showMemoryUsage)
+ {
+ if (percentUsage < 20)
+ g.setColor(Color.red);
+
+ g.drawString("Total Free Memory: " + df.format(totalFreeMemory)
+ + "MB; Max Memory: " + df.format(maxMemory)
+ + "MB; " + df.format(percentUsage) + "%", 10,
+ getHeight() - g.getFontMetrics().getHeight());
+ }
+ }
+ }
+
+ }