LineNumberReader類的getLineNumber()方法 (LineNumberReader Class getLineNumber() method)

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

  getLineNumber()方法在java.io包中可用。

• getLineNumber() method is used to return the present line number in this LineNumberReader stream.

  getLineNumber()方法用于返回此LineNumberReader流中的當(dāng)前行號(hào)。

• getLineNumber() 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.

  getLineNumber()方法是一個(gè)非靜態(tài)方法，只能使用類對(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。

• getLineNumber() method does not throw an exception at the time of returning the current line number.

  getLineNumber()方法在返回當(dāng)前行號(hào)時(shí)不會(huì)引發(fā)異常。

Syntax:

句法：

public int getLineNumber();

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 present line number from this LineNumberReader.

方法的返回類型為int ，它從此LineNumberReader返回當(dāng)前行號(hào)。

Example:

例：

// Java program to demonstrate the example // of int getLineNumber() method of // LineNumberReaderimport java.io.*;public class GetLineNumberOfLNR {public static void main(String[] args) throws Exception {FileReader fr_stm = null;LineNumberReader line_r = null;int val = 0;try {// Instantiates FileReader and LineNumberReaderfr_stm = new FileReader("D:\\includehelp.txt");line_r = new LineNumberReader(fr_stm);// By using getLineNumber() method is to// return the current line number in this// stream line_rint line_num = line_r.getLineNumber();System.out.println("line_r.getLineNumber(): " + line_num);} 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 (fr_stm != null) {fr_stm.close();if (line_r != null) {line_r.close();}}}} }

Output

輸出量

line_r.getLineNumber(): 0

翻譯自: https://www.includehelp.com/java/linenumberreader-getlinenumber-method-with-example.aspx

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