PipedInputStream類的available()方法 (PipedInputStream Class available() method)

• available() method is available in java.io package.

  available()方法在java.io包中可用。

• available() method is used to return the number of available bytes left that can be read from this PipedInputStream without blocking.

  available()方法用于返回可以從此PipedInputStream讀取而不會阻塞的剩余可用字節(jié)數(shù)。

• available() method is a non-static method, it is accessible with the class object only and if we try to access the method with the class name then we will get an error.

  available()方法是一種非靜態(tài)方法，只能通過類對象訪問，如果嘗試使用類名稱訪問該方法，則會收到錯誤消息。

• available() method may throw an exception at the time of returning the available bytes left.

  在返回剩余的可用字節(jié)時， available()方法可能會引發(fā)異常。

  IOException: This exception may throw when getting any input/output error while performing.

  IOException ：在執(zhí)行過程中遇到任何輸入/輸出錯誤時，可能引發(fā)此異常。

Syntax:

句法：

public int available();

Parameter(s):

參數(shù)：

• It does not accept any parameter.

  它不接受任何參數(shù)。

Return value:

返回值：

The return type of the method is int, it returns the number of available bytes that can be read without blocking as it may return 0 when this stream closed by using the close() method.

方法的返回類型為int ，它返回可以讀取而不會阻塞的可用字節(jié)數(shù)，因為當(dāng)使用close()方法關(guān)閉此流時，它可能返回0。

Example:

例：

// Java program to demonstrate the example // of int available() method // of PipedInputStreamimport java.io.*;public class AvailableOfPIS {public static void main(String[] args) throws Exception {int val = 65;try {// Instantiates PipedInputStream and // PipedOutputStreamPipedInputStream pipe_in = new PipedInputStream();PipedOutputStream pipe_out = new PipedOutputStream();// By using connect() method is to connect// this pipe_in to the given pipe_outpipe_in.connect(pipe_out);for (int i = 0; i < 3; ++i) {// By using write() method is to// write the val to the stream pipe_outpipe_out.write(val);val++;}// By using available() method is to return// the available bytes to be readint avail_bytes = pipe_in.available();System.out.println("pipe_in.available(): " + avail_bytes);for (int i = 0; i < 3; ++i) {// By using read() method is to// read the integer and convert it into// charchar ch = (char) pipe_in.read();System.out.println("pipe_in.read(): " + ch);}// By using close() method is to close// the streampipe_in.close();pipe_out.close();} catch (Exception ex) {System.out.println(ex.toString());}} }

Output

輸出量

pipe_in.available(): 3 pipe_in.read(): A pipe_in.read(): B pipe_in.read(): C

翻譯自: https://www.includehelp.com/java/pipedinputstream-available-method-with-example.aspx

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