tests/gc/ThreadSleep.java

   1 import java.util.Random;
   2
   3 public class ThreadSleep extends Thread {
   4         public static final int N=5;
   5         public static final int MOD_GC=2;
   6         public static final int SLEEP_FIX=1000;
   7         public static final int SLEEP_RND=500;
   8
   9         public static Random rnd;
  10
  11         public int id;
  12         public int cnt;
  13         public Object o;
  14
  15         public void run() {
  16                 String myString;
  17
  18                 myString = new String("LocObj#" + this.id);
  19
  20                 while (true) {
  21                         try {
  22                                 sleep(SLEEP_FIX + rnd.nextInt(SLEEP_RND));
  23                         } catch(Exception e) {
  24                                 System.out.println("Thread #" + this.id + " had an Exception");
  25                         }
  26
  27                         this.cnt++;
  28
  29                         System.out.println("(" + this.id + ") Thread woke up:");
  30                         System.out.println("(" + this.id + ")\t cnt=" + this.cnt + ", o=\'" + this.o + "\'");
  31                         System.out.println("(" + this.id + ")\t local=\'" + myString + "\'");
  32
  33                         if (this.cnt % MOD_GC == 0) {
  34                                 System.out.println("(" + this.id + ") Starting the GC now!...");
  35                                 System.gc();
  36                         }
  37                 }
  38         }
  39
  40         public static void main(String args[]) {
  41                 ThreadSleep t = null;
  42
  43                 rnd = new Random();
  44
  45                 System.out.println("Creating and starting threads ...");
  46                 for (int i=0; i<N; i++) {
  47                         t = new ThreadSleep();
  48                         t.id = i;
  49                         t.cnt = 0;
  50                         t.o = new String("GlobObj#" + i);
  51                         t.start();
  52                 }
  53                 t = null;
  54
  55                 System.out.println("Finished.");
  56         }
  57 }