CharArrayReader類mark()方法 (CharArrayReader 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 the stream and whenever the call to reset() method so it reset the stream to the position set by the most recent call of mark() method.

  mark()方法用于標(biāo)記流中的當(dāng)前位置，并在每次調(diào)用reset()方法時(shí)將其重置為由最近調(diào)用mark()方法設(shè)置的位置。

• 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(guò)類對(duì)象訪問(wèn)，如果嘗試使用類名稱訪問(wèn)該方法，則會(huì)收到錯(cuò)誤消息。

• mark() method may throw an exception at the time of marking the stream.

  mark()方法在標(biāo)記流時(shí)可能會(huì)引發(fā)異常。

  IOException: This exception may throw when the given parameter is not valid.

  IOException ：如果給定參數(shù)無(wú)效，則可能引發(fā)此異常。

Syntax:

句法：

public void mark(int r_limit);

Parameter(s):

參數(shù)：

• int r_limit – represents the limit on the number of character that can be read while preserving the mark.

  int r_limit –表示保留標(biāo)記時(shí)可以讀取的字符數(shù)限制。

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 r_limit) method of // CharArrayReaderimport java.io.*;public class MarkOfCAR {public static void main(String[] args) {CharArrayReader car_stm = null;char[] c_arr = {'a','b','c','d'};try {// Instantiates CharArrayReadercar_stm = new CharArrayReader(c_arr);// By using read() method isto // read the character from car_stmint i1 = car_stm.read();int i2 = car_stm.read();int i3 = car_stm.read();int i4 = car_stm.read();System.out.println("i1: " + i1);// By using mark() method isto// set the current position in this// car_stmSystem.out.println("car_stm.mark(0): ");car_stm.mark(0);System.out.println("i2: " + i2);System.out.println("i3: " + i3);// By using reset() method isto// reset the stream to the position // set by the call mark() methodSystem.out.println("car_stm.reset(): ");car_stm.reset();System.out.println("i2: " + i2);System.out.println("i3: " + i3);System.out.println("i4: " + i4);} catch (IOException e) {System.out.print("Stream closed!!!!");} finally {// Free all system resources linked// with the stream after closing// the streamif (car_stm != null)car_stm.close();}} }

Output

輸出量

i1: 97 car_stm.mark(0): i2: 98 i3: 99 car_stm.reset(): i2: 98 i3: 99 i4: 100

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

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