LineNumberReader

java.lang.Object
- java.io.Reader
- - java.io.BufferedReader
  - - java.io.LineNumberReader

所有已实现的接口:

Closeable, AutoCloseable, Readable
```
public class LineNumberReader
extends BufferedReader
```
A buffered character-input stream that keeps track of line numbers. This class defines methods setLineNumber(int) and getLineNumber() for setting and getting the current line number respectively.
By default, line numbering begins at 0. This number increments at every line terminator as the data is read, and can be changed with a call to setLineNumber(int). Note however, that setLineNumber(int) does not actually change the current position in the stream; it only changes the value that will be returned by getLineNumber().
A line is considered to be terminated by any one of a line feed ('\n'), a carriage return ('\r'), or a carriage return followed immediately by a linefeed.

从以下版本开始:

JDK1.1

字段概要
- 从类继承的字段 java.io.Reader
  lock

构造器概要

构造器
构造器	说明
`LineNumberReader(Reader in)`	Create a new line-numbering reader, using the default input-buffer size.
`LineNumberReader(Reader in, int sz)`	Create a new line-numbering reader, reading characters into a buffer of the given size.

方法概要

所有方法实例方法具体方法
限定符和类型	方法	说明
`int`	`getLineNumber()`	Get the current line number.
`void`	`mark(int readAheadLimit)`	Mark the present position in the stream.
`int`	`read()`	Read a single character.
`int`	`read(char[] cbuf, int off, int len)`	Read characters into a portion of an array.
`String`	`readLine()`	Read a line of text.
`void`	`reset()`	Reset the stream to the most recent mark.
`void`	`setLineNumber(int lineNumber)`	Set the current line number.
`long`	`skip(long n)`	Skip characters.

从类继承的方法 java.io.BufferedReader
close, lines, markSupported, ready

从类继承的方法 java.lang.Object
clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

从类继承的方法 java.io.Reader
read, read

- 构造器详细资料
  - LineNumberReader
```
public LineNumberReader(Reader in)
```
    Create a new line-numbering reader, using the default input-buffer size.
    
    参数:
    
    in - A Reader object to provide the underlying stream
  - LineNumberReader
```
public LineNumberReader(Reader in,
                        int sz)
```
    Create a new line-numbering reader, reading characters into a buffer of the given size.
    
    参数:
    
    in - A Reader object to provide the underlying stream
    
    sz - An int specifying the size of the buffer
- 方法详细资料
  - setLineNumber
```
public void setLineNumber(int lineNumber)
```
    Set the current line number.
    
    参数:
    
    lineNumber - An int specifying the line number
    
    另请参阅:
    
    getLineNumber()
  - getLineNumber
```
public int getLineNumber()
```
    Get the current line number.
    
    返回:
    
    The current line number
    
    另请参阅:
    
    setLineNumber(int)
  - read
```
public int read()
         throws IOException
```
    Read a single character. Line terminators are compressed into single newline ('\n') characters. Whenever a line terminator is read the current line number is incremented.
    
    覆盖:
    
    read 在类中 BufferedReader
    
    返回:
    
    The character read, or -1 if the end of the stream has been reached
    
    抛出:
    
    IOException - If an I/O error occurs
  - read
```
public int read(char[] cbuf,
                int off,
                int len)
         throws IOException
```
    Read characters into a portion of an array. Whenever a line terminator is read the current line number is incremented.
    
    覆盖:
    
    read 在类中 BufferedReader
    
    参数:
    
    cbuf - Destination buffer
    
    off - Offset at which to start storing characters
    
    len - Maximum number of characters to read
    
    返回:
    
    The number of bytes read, or -1 if the end of the stream has already been reached
    
    抛出:
    
    IOException - If an I/O error occurs
  - readLine
```
public String readLine()
                throws IOException
```
    Read a line of text. Whenever a line terminator is read the current line number is incremented.
    
    覆盖:
    
    readLine 在类中 BufferedReader
    
    返回:
    
    A String containing the contents of the line, not including any line termination characters, or null if the end of the stream has been reached
    
    抛出:
    
    IOException - If an I/O error occurs
    
    另请参阅:
    
    Files.readAllLines(java.nio.file.Path, java.nio.charset.Charset)
  - skip
```
public long skip(long n)
          throws IOException
```
    Skip characters.
    
    覆盖:
    
    skip 在类中 BufferedReader
    
    参数:
    
    n - The number of characters to skip
    
    返回:
    
    The number of characters actually skipped
    
    抛出:
    
    IOException - If an I/O error occurs
    
    IllegalArgumentException - If n is negative
  - mark
```
public void mark(int readAheadLimit)
          throws IOException
```
    Mark the present position in the stream. Subsequent calls to reset() will attempt to reposition the stream to this point, and will also reset the line number appropriately.
    
    覆盖:
    
    mark 在类中 BufferedReader
    
    参数:
    
    readAheadLimit - Limit on the number of characters that may be read while still preserving the mark. After reading this many characters, attempting to reset the stream may fail.
    
    抛出:
    
    IOException - If an I/O error occurs
  - reset
```
public void reset()
           throws IOException
```
    Reset the stream to the most recent mark.
    
    覆盖:
    
    reset 在类中 BufferedReader
    
    抛出:
    
    IOException - If the stream has not been marked, or if the mark has been invalidated

类 LineNumberReader

字段概要

从类继承的字段 java.io.Reader

构造器概要

方法概要

从类继承的方法 java.io.BufferedReader

从类继承的方法 java.lang.Object

从类继承的方法 java.io.Reader

构造器详细资料

LineNumberReader

LineNumberReader

方法详细资料

setLineNumber

getLineNumber

read

read

readLine

skip

mark

reset