content: /*
   * Copyright (C) 2014 The Android Open Source Project
   *
   * Licensed under the Apache License, Version 2.0 (the "License");
   * you may not use this file except in compliance with the License.
   * You may obtain a copy of the License at
   *
   *      http://www.apache.org/licenses/LICENSE-2.0
   *
   * Unless required by applicable law or agreed to in writing, software
   * distributed under the License is distributed on an "AS IS" BASIS,
   * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
   * See the License for the specific language governing permissions and
   * limitations under the License.
   */
  
  import java.util.Map;
  
  public class Main implements Runnable {
      static final int numberOfThreads = 5;
      static final int totalOperations = 1000;
  
      public static void main(String[] args) throws Exception {
          final Thread[] threads = new Thread[numberOfThreads];
          for (int t = 0; t < threads.length; t++) {
              threads[t] = new Thread(new Main());
              threads[t].start();
          }
          for (Thread t : threads) {
              t.join();
          }
          System.out.println("Finishing");
      }
  
      public void test_getId() {
          if (Thread.currentThread().getId() <= 0) {
              System.out.println("current thread's ID is not positive");
          }
          // Check all the current threads for positive IDs.
          Map<Thread, StackTraceElement[]> stMap = Thread.getAllStackTraces();
          for (Thread thread : stMap.keySet()) {
              if (thread.getId() <= 0) {
                  System.out.println("thread's ID is not positive: " + thread.getName());
              }
          }
      }
  
      public void run() {
          for (int i = 0; i < totalOperations; ++i) {
              test_getId();
          }
      }
  }
  