LineNumberInputStream类reset()方法 (LineNumberInputStream 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 LineNumberInputStream and it reset the stream to the position of the most recent mark() was set on this stream.

  reset()方法用于重置此LineNumberInputStream，并将该流重置为对此流设置的最新mark()的位置。

• 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()方法是一种非静态方法，只能通过类对象访问，如果尝试使用类名称访问该方法，则会收到错误消息。

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

  reset()方法在重置流时可能会引发异常。

  IOException: This exception may throw when getting any input/output error while performing.

  IOException ：在执行过程中遇到任何输入/输出错误时，可能引发此异常。

Syntax:

句法：

    public void reset();

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 void, it returns nothing.

该方法的返回类型为void ，不返回任何内容。

Example:

例：

// Java program to demonstrate the example 
// of void mark(int r_limit) method of 
// LineNumberInputStream

import java.io.*;

public class MarkOfLNIS {
    
 public static void main(String[] args) throws Exception {
    
  FileInputStream fis_stm = null;
  LineNumberInputStream line_stm = null;
  int val = 0;

  try {
    
   // Instantiates FileInputStream
   fis_stm = new FileInputStream("D:\\includehelp.txt");
   line_stm = new LineNumberInputStream(fis_stm);

   // By using read() method isto 
   // read the character from line_stm
   char ch1 = (char) line_stm.read();
   char ch2 = (char) line_stm.read();
   char ch3 = (char) line_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
   // line_stm

   System.out.println("line_stm.mark(0): ");
   line_stm.mark(0);
   char ch4 = (char) line_stm.read();
   char ch5 = (char) line_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() method

   System.out.println("line_stm.reset(): ");
   line_stm.reset();
   char ch6 = (char) line_stm.read();
   char ch7 = (char) line_stm.read();
   char ch8 = (char) line_stm.read();
   char ch9 = (char) line_stm.read();


   System.out.println("ch4: " + ch6);
   System.out.println("ch5: " + ch7);
   System.out.println("ch6: " + ch8);
   System.out.println("ch7: " + ch9);

  } 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 (fis_stm != null) {
    
    fis_stm.close();
    if (line_stm != null) {
    
     line_stm.close();
    }
   }
  }
 }
}

Output

输出量

ch1: J
ch2: A
ch3: V
line_stm.mark(0):
ch4: A
ch5: W
line_stm.reset(): Reset Not Supported

翻译自: https://www.includehelp.com/java/linenumberinputstream-reset-method-with-example.aspx