BufferedReader類mark()方法 (BufferedReader Class mark() method)

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

  mark()方法在java.io包中可用。

• mark() method is used to mark the current position in this stream and whenever we call reset() method so it will reset the stream to the given point (read_from_here).

  mark()方法用于標記此流中的當前位置，并且每當我們調(diào)用reset()方法時，都會將流重置到給定點(read_from_here)。

• 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(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。

• mark() method may throw an exception at the time of setting a limit.

  設置限制時， mark()方法可能會引發(fā)異常。

  • IllegalArgumentException: This exception may throw when the given parameter is negative.IllegalArgumentException ：如果給定參數(shù)為負，則可能引發(fā)此異常。
  • IOException: This exception may throw while performing input/output operation.IOException ：在執(zhí)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(shù)：

• int read_from_here – represents the number of bytes to read during mark() preserves.

  int read_from_here –表示mark()保留期間要讀取的字節(jié)數(shù)。

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(nèi)容。

Example:

例：

// Java program to demonstrate the example // of void mark(int read_from_here) method of // BufferedReaderimport java.io.*;public class MarkBR {public static void main(String[] args) throws Exception {// To open text file by using // FileInputStreamFileInputStream fis = new FileInputStream("e:/includehelp.txt");// Instantiates InputStreamReader InputStreamReader inp_r = new InputStreamReader(fis);// Instantiates BufferedReader BufferedReader buff_r = new BufferedReader(inp_r);// Read character from the streamchar ch1 = (char) buff_r.read();char ch2 = (char) buff_r.read();char ch3 = (char) buff_r.read();System.out.println("ch1: " + ch1);System.out.println("ch2 : " + ch2);// By using mark() method isto// set the limit the number of byte// to be read System.out.println("buff_r.mark(5): ");buff_r.mark(5);System.out.println("ch3: " + ch3);// reset stream by using reset()System.out.println("buff_r.reset(): ");buff_r.reset();// Read from the streadchar ch4 = (char) buff_r.read();char ch5 = (char) buff_r.read();// Display characterSystem.out.println("ch4: " + ch4);System.out.println("ch5: " + ch5);fis.close();inp_r.close();buff_r.close();} }

Output

輸出量

ch1: H ch2 : e buff_r.mark(5): ch3: l buff_r.reset(): ch4: l ch5: o

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

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