ByteArrayInputStream類mark()方法 (ByteArrayInputStream Class mark() method)

• mark() method is available in java.util package.

  mark()方法在java.util包中可用。

• mark() method is used to set the current mark position in the stream from where read or write can be reset.

  mark()方法用于設置流中的當前標記位置，從該位置可以重置讀取或寫入。

• mark() 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.

  mark()方法是一種非靜態方法，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。

• mark() method may throw an exception at the time of seeking mark position.

  在尋求標記位置時， mark()方法可能會引發異常。

  IOException: This exception may throw while performing input/output operations.

  IOException ：在執行輸入/輸出操作時，可能會拋出此異常。

Syntax:

句法：

public void mark(int read_from_here);

Parameter(s):

參數：

• int read_from_here – represents the mark position where reading or writing can start.

  int read_from_here –表示可以開始讀取或寫入的標記位置。

Return value:

返回值：

The return type of the method is void, it returns nothing.

該方法的返回類型為void ，不返回任何內容。

Example:

例：

// Java program to demonstrate the example // of void mark(int read_from_here) method of // ByteArrayInputStreamimport java.io.*;public class MarkBAIS {public static void main(String[] args) throws Exception {byte[] by = {97,98,98,99};// Instantiates ByteArrayInputStream ByteArrayInputStream byte_s = new ByteArrayInputStream(by);// By using available() method is to// return the no. of bytes to be left // for readingInteger n_byte = byte_s.available();System.out.println("Left avail bytes = " + n_byte);// Read character from the streamchar ch1 = (char) byte_s.read();char ch2 = (char) byte_s.read();char ch3 = (char) byte_s.read();System.out.println("ch1: " + ch1);System.out.println("ch2 : " + ch2);System.out.println("byte_s.mark(5): ");// By using mark() method isto// set the limit the number of byte// to be read byte_s.mark(5);System.out.println("ch3: " + ch3);System.out.println("buff_str.reset(): ");// reset stream by using reset()byte_s.reset();// Read from the streadchar ch4 = (char) byte_s.read();char ch5 = (char) byte_s.read();// Display characterSystem.out.println("ch4: " + ch4);System.out.println("ch5: " + ch5);byte_s.close();} }

Output

輸出量

Left avail bytes = 4 ch1: a ch2 : b byte_s.mark(5): ch3: b buff_str.reset(): ch4: c ch5: ?

翻譯自: https://www.includehelp.com/java/bytearrayinputstream-mark-method-with-example.aspx

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