swing - Process Management using JAVA -

i developing swing application in java shows memory usage of each process on pc

the result should appear in jtable

the jtable contains 4 columns :

• 1) process name
• 2) pid
• 3) session name
• 4) memory usage

the jtable appear like

the jtable refresh each period using processbuilder class

the problem felt method little bit slow , boring when user see it

and question:

is there other powerful method ? or can in code enhance application?

in code :

"processtable" field jtable dragged palette (of type javax.swing.jtable)

"status" field jlabel dragged palette (of type javax.swing.jlabel)

the method used display process :

@suppresswarnings("empty-statement")     private void getprocesslist() throws interruptedexception {          private defaulttablemodel table;                 string filename = system.getproperty("java.io.tmpdir") + "\\list.txt", h;//to %tmp%         scanner sc1 = null;         int i, j, k = 0;         table = (javax.swing.table.defaulttablemodel) processtable.getmodel();         processtable.editingstopped(null);         table.setrowcount(0);         try {             processbuilder builder = new processbuilder("cmd.exe", "/c", "tasklist > %tmp%\\list.txt");             builder.redirecterrorstream(true);             process p = builder.start();             p.waitfor();             try {                 sc1 = new scanner(new file(filename));                 while (sc1.hasnext()) {                     h = sc1.nextline();                     k++;                 }                 k = k - 5;             } catch (filenotfoundexception ex) {                 system.out.println("file " + filename + " not found");             };             status.settext(" processes: " + k);             object o[] = new object[4];             = 0;             try {                 j = 0;                 sc1 = new scanner(new file(filename));                 while (sc1.hasnext()) {                     st = new stringtokenizer(sc1.nextline(), "\n");                     i++;                     if (i > 5) {                         while (st.hasmoretokens()) {                             st1 = new stringtokenizer(st.nexttoken(), " ");                             if (st1.hasmoretokens()) {                                 o[0] = st1.nexttoken();                             }                             if (st1.hasmoretokens()) {                                 h = st1.nexttoken();                                 if (h.contains(".exe")) {                                     o[0] = o[0] + " " + h;                                     o[1] = st1.nexttoken();                                 } else {                                     o[1] = h;                                 }                             }                             if (st1.hasmoretokens()) {                                 o[2] = st1.nexttoken();                             }                             if (st1.hasmoretokens()) {                                 h = st1.nexttoken();                             }                             if (st1.hasmoretokens()) {                                 o[3] = st1.nexttoken();                             }                             if (st1.hasmoretokens()) {                                 h = st1.nexttoken();                             }                             table.addrow(o);                             j++;                         }                     } else {                         if (st.hasmoretokens()) {                             h = st.nexttoken();                         }                     }                 }             } catch (filenotfoundexception ex) {                 system.out.println("file " + filename + " not found");             } catch (exception ex) {                 system.out.println("unknownerror: " + ex.getmessage());             } {                 if (sc1 != null) {                     sc1.close();                 }             }         } catch (ioexception ex) {             logger.getlogger(processman.class.getname()).log(level.severe, null, ex);         }      } 

you can speed things without many changes by:

• using separate thread poll running processes (instead of using edt); , writing changes jtable's tablemodel.
• avoiding intermediate file when calling tasklist, , instead reading output string, parse.

otherwise, go native: see https://stackoverflow.com/a/13478716/15472 example.