String line;
                while ((line = reader.readLine()) != null) {
                    ps.println(line);
                }
            } catch (Exception e) {
                e.printStackTrace();
            } finally {
                latch.countDown();
            }
        }).start();
        return os;
    }

            thread.interrupt();
        }
        catch ( SecurityException e ) {
            e.printStackTrace();
        }
    }


    private static void joinThread ( Thread thread ) {
        try {
            thread.join();
        }
        catch ( InterruptedException e ) {
            e.printStackTrace();
        }
    }


    private static boolean isAllDigits ( String hostname ) {

            .url("http://publicobject.com/helloworld.txt")
            .build()

        client.newCall(request).enqueue(object : Callback {
          override fun onFailure(call: Call, e: IOException) {
            e.printStackTrace()
          }

          override fun onResponse(call: Call, response: Response) {
            response.use {
              if (!response.isSuccessful) throw IOException("Unexpected code $response")

   */
  @GwtIncompatible // java.io.PrintWriter, java.io.StringWriter
  public static String getStackTraceAsString(Throwable throwable) {
    StringWriter stringWriter = new StringWriter();
    throwable.printStackTrace(new PrintWriter(stringWriter));
    return stringWriter.toString();
  }

  /**
   * Returns the stack trace of {@code throwable}, possibly providing slower iteration over the full

   */
  @GwtIncompatible // java.io.PrintWriter, java.io.StringWriter
  public static String getStackTraceAsString(Throwable throwable) {
    StringWriter stringWriter = new StringWriter();
    throwable.printStackTrace(new PrintWriter(stringWriter));
    return stringWriter.toString();
  }

  /**
   * Returns the stack trace of {@code throwable}, possibly providing slower iteration over the full

            newStringUnsafeMethod = javaLangAccessClass.getMethod("newStringUnsafe", char[].class);
        } catch (final Throwable t) {
            // ignore
            // t.printStackTrace();
        }
    }

    /**
     * 文字列が<code>null</code>または空文字列なら<code>true</code>を返します。
     *
     * @param text
     *            文字列
     * @return 文字列が<code>null</code>または空文字列なら<code>true</code>

            } else {
                buf.append(t.getMessage());
            }
            try (final StringWriter sw = new StringWriter(); final PrintWriter pw = new PrintWriter(sw)) {
                t.printStackTrace(pw);
                pw.flush();
                buf.append(" [ ").append(sw.toString()).append(" ]");
            } catch (final IOException ignore) {}
            return buf.toString();
        };

   * wrapping it in an AssertionFailedError if necessary.
   */
  public void threadUnexpectedException(Throwable t) {
    threadRecordFailure(t);
    t.printStackTrace();
    if (t instanceof RuntimeException) throw (RuntimeException) t;
    else if (t instanceof Error) throw (Error) t;
    else {
      AssertionFailedError afe = new AssertionFailedError("unexpected exception: " + t);

      PrintWriter writer = new PrintWriter(message);
      writer.println("Expected no failures, but found:");
      for (AssertionError failure : failures) {
        failure.printStackTrace(writer);
      }
      failures.clear();
      assertWithMessage(message.toString()).fail();
    }
  }

  static final class TestCloseable implements Closeable {

   * wrapping it in an AssertionFailedError if necessary.
   */
  public void threadUnexpectedException(Throwable t) {
    threadRecordFailure(t);
    t.printStackTrace();
    if (t instanceof RuntimeException) throw (RuntimeException) t;
    else if (t instanceof Error) throw (Error) t;
    else {
      AssertionFailedError afe = new AssertionFailedError("unexpected exception: " + t);