为什么以下代码打印值无法运行？

Question

as the cat /proc/meminfo provides dynamic details I want to update the text area system values change. I tried the following.But doesn't work.Please help

Thread th=new Thread(new Runnable() {
public void run() {
while(true)
{
  try{
       p = Runtime.getRuntime().exec("cat /proc/meminfo");
         BufferedReader br = new BufferedReader(
                     new InputStreamReader(p.getInputStream()));
                 while ((s = br.readLine()) != null)
                 {
                     textArea.append(s+"\n");
                 }
                 p.waitFor();
                 p.destroy();
      }
      catch(Exception e)
      {

      }
 }
});     

Answer 1

As far as I can see, textArea isn't doing anything. To print values in Java, use System.out.println .

You can replace:

textArea.append(s+"\n");

With:

System.out.print(s+"\n");

Or even easier: println automatically appends a new line after your text:

System.out.println(s);

Another issue is that the readLine method could be hanging your program. Step through with a debugger if that's the case.