java reader

讀取器類的reset()方法 (Reader Class reset() method)

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

  reset()方法在java.io包中可用。

• reset() method is used to reset this stream to the mark set by mark() method most recently.

  reset()方法用于將此流重置為mark()方法最近設置的標記。

• reset() 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.

  reset()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。

• reset() method may throw an exception at the time of resetting the stream.

  reset()方法在重置流時可能會引發異常。

  IOException: This exception may throw when getting any input/output error or unsupported reset() method.

  IOException ：當遇到任何輸入/輸出錯誤或不受支持的reset()方法時，可能引發此異常。

Syntax:

句法：

public void reset();

Parameter(s):

參數：

• It does not accept any parameter.

  它不接受任何參數。

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 reset() method of Readerimport java.io.*;public class ResetOfR {public static void main(String[] args) throws Exception {Reader r_stm = null;try {// Instantiates Readerr_stm = new StringReader("JavaWorld!!!!");// By using read() method isto // read the character from r_stmchar ch1 = (char) r_stm.read();char ch2 = (char) r_stm.read();char ch3 = (char) r_stm.read();System.out.println("ch1: " + ch1);System.out.println("ch2: " + ch2);System.out.println("ch3: " + ch3);// By using mark() method isto// set the current position in this// r_stmSystem.out.println("r_stm.mark(1): ");r_stm.mark(1);char ch4 = (char) r_stm.read();char ch5 = (char) r_stm.read();System.out.println("ch4: " + ch4);System.out.println("ch5: " + ch5);// By using reset() method isto// reset the stream to the position // set by the call mark() methodSystem.out.println("r_stm.reset(): ");r_stm.reset();char ch6 = (char) r_stm.read();char ch7 = (char) r_stm.read();char ch8 = (char) r_stm.read();char ch9 = (char) r_stm.read();char ch10 = (char) r_stm.read();char ch11 = (char) r_stm.read();char ch12 = (char) r_stm.read();System.out.println("ch4: " + ch6);System.out.println("ch5: " + ch7);System.out.println("ch6: " + ch8);System.out.println("ch7: " + ch9);System.out.println("ch8: " + ch10);System.out.println("ch9: " + ch11);System.out.println("ch10: " + ch12);} catch (Exception ex) {System.out.println(ex.toString());} finally {// with the help of this block is to// free all necessary resources linked// with the streamif (r_stm != null) {r_stm.close();}}} }

Output

輸出量

ch1: J ch2: a ch3: v r_stm.mark(1): ch4: a ch5: W r_stm.reset(): ch4: a ch5: W ch6: o ch7: r ch8: l ch9: d ch10: !

翻譯自: https://www.includehelp.com/java/reader-reset-method-with-example.aspx

java reader

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