Java管道流实现线程间通信过程解析

public class PipeStreamTest {
  public static void main(String[] args) throws IOException, InterruptedException {
    WriteData writeData = new WriteData();
    ReadData readData = new ReadData();

    PipedReader reader = new PipedReader();
    PipedWriter writer = new PipedWriter();

    writer.connect(reader);

    new Thread(() -> {
      writeData.writeMethod(writer);
    }).start();

    Thread.sleep(2000);

    new Thread(() -> {
      readData.readMethod(reader);
    }).start();
  }

  static class WriteData {
    public void writeMethod(PipedWriter writer) {
      try {
        System.out.println("write :");
        for (int i = 0; i < 300; i++) {
          String outData = "" + (i + 1);
          writer.write(outData);
          System.out.print(outData);
        }
        System.out.println();
        writer.close();
      } catch (IOException e) {
        e.printStackTrace();
      }
    }
  }

  static class ReadData {
    public void readMethod(PipedReader reader) {
      try {
        System.out.println("read :");
        char[] byteArray = new char[20];
        int readLength = reader.read(byteArray);
        while (readLength != -1) {
          String newData = new String(byteArray, 0, readLength);
          System.out.print(newData);
          readLength = reader.read(byteArray);
        }
        System.out.println();
        reader.close();
      } catch (IOException e) {
        e.printStackTrace();
      }
    }
  }
}