Java LineNumberReader getLineNumber（）方法及示例

LineNumberReader类的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流中的当前行号。
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()方法是一个非静态方法，只能使用类对象访问，如果尝试使用类名称访问该方法，则会收到错误消息。
getLineNumber() method does not throw an exception at the time of returning the current line number.
getLineNumber()方法在返回当前行号时不会引发异常。

Syntax:

句法：

    public int getLineNumber();

Parameter(s):

参数：

It does not accept any parameter.
它不接受任何参数。

Return value:

返回值：

The return type of the method is int, it returns the present line number from this LineNumberReader.

方法的返回类型为int ，它从此LineNumberReader返回当前行号。

Example:

例：

// Java program to demonstrate the example 
// of int getLineNumber() method of 
// LineNumberReader
import 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 LineNumberReader
fr_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_r
int 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 stream
if (fr_stm != null) {
fr_stm.close();
if (line_r != null) {
line_r.close();
}
}
}
}
}

Output

输出量