Examples of java.io.PrintWriter.checkError()

java.io.PrintWriter.checkError()
Answers a boolean indicating whether or not this PrintWriter has encountered an error. If so, the receiver should probably be closed since further writes will not actually take place. A side effect of calling checkError is that the target Writer is flushed. @return boolean has an error occurred in this PrintWriter.

    Socket sock = new Socket(InetAddress.getLocalHost(), PORT);
    OutputStream out = sock.getOutputStream();
    PrintWriter writer = new PrintWriter(new OutputStreamWriter(out));


    writer.print("HELO foo\r\n");
    assert(!writer.checkError());


    Thread.sleep(2000);


    writer.print("HELO bar\r\n");
    assert(writer.checkError());

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    assert(!writer.checkError());


    Thread.sleep(2000);


    writer.print("HELO bar\r\n");
    assert(writer.checkError());


    wiser.stop();
  }


  /** */

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            // Print the file epilog
            writer.println("</tomcat-users>");


            // Check for errors that occurred while printing
            if (writer.checkError()) {
                writer.close();
                fileNew.delete();
                throw new IOException
                    (sm.getString("memoryUserDatabase.writeException",
                                  fileNew.getAbsolutePath()));

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                }


                @Override
                public boolean checkError() {
                    this.checkClosed();
                    return delegatee.checkError();
                }


                @Override
                public void close() {
                    this.checkClosed();

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        assert name != null;
        assert script != null;
        PrintWriter output = open(name);
        try {
            DmdlEmitter.emit(script, output);
            if (output.checkError()) {
                throw new IOException(MessageFormat.format(
                        "Cannot output DMDL {0}",
                        name));
            }
        } finally {

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            // Print the file epilog
            writer.println("</tomcat-users>");


            // Check for errors that occurred while printing
            if (writer.checkError()) {
                writer.close();
                fileNew.delete();
                throw new IOException
                    (sm.getString("memoryUserDatabase.writeException",
                                  fileNew.getAbsolutePath()));

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            // Print the file epilog
            writer.println("</database>");


            // Check for errors that occurred while printing
            if (writer.checkError()) {
                writer.close();
                fileNew.delete();
                throw new IOException
                    ("Saving database to '" + pathname + "'");
            }

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      } catch (IOException e) {
        throw new TermException(new JavaObjectTerm(e));
      }
    } else if (stream instanceof PrintWriter) {
      PrintWriter out = (PrintWriter) stream;
      if (out.checkError()) {
        if (!forceFlag) {
          throw new SystemException("output stream error");
        }
      }
      out.flush();

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            // Print the file epilog
            writer.println("</tomcat-users>");


            // Check for errors that occurred while printing
            if (writer.checkError()) {
                writer.close();
                fileNew.delete();
                throw new IOException
                    (sm.getString("memoryUserDatabase.writeException",
                                  fileNew.getAbsolutePath()));

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    {
      writer.flush();
      writer.close();


      // Check for errors
      if (writer.checkError())
      {
        if (file.exists())
          file.delete();


        _error(_XML_ENCODING_ERROR + path);

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