Java Reader reset()方法及实例

来源：这里教程网时间：2026-02-17 21:07:45 作者：

Java Reader reset()方法及实例

Java中阅读器类的reset()方法是用来重置流的。重置后，如果流已经被标记，那么该方法将尝试在标记处重新定位，否则它将尝试将其定位到起始位置。

语法。

public void reset()

参数。此方法不接受任何参数。

返回值。此方法不返回任何值。

异常。该方法会抛出IOException。

如果在输入输出时发生一些错误如果流还没有被标记如果标记已被废止如果reset()方法不被支持。

下面的方法说明了reset()方法的工作。

程序1:

// Java program to demonstrate// Reader reset() method  import java.io.*;import java.util.*;  class GFG {    public static void main(String[] args)    {          try {              String str = "GeeksForGeeks";              // Create a Reader instance            Reader reader                = new StringReader(str);              // Get the character            // to be read from the stream            int ch;              // Read the first 10 characters            // to this reader using read() method            // This will put the str in the stream            // till it is read by the reader            for (int i = 0; i < 10; i++) {                ch = reader.read();                System.out.print((char)ch);            }              System.out.println();              // mark the stream for            // 5 characters using reset()            reader.mark(5);              // reset the stream position            reader.reset();              // Read the 5 characters from marked position            // to this reader using read() method            for (int i = 0; i < 5; i++) {                ch = reader.read();                System.out.print((char)ch);            }        }        catch (Exception e) {            System.out.println(e);        }    }}

输出:

GeeksForGeeks??

程序2。

// Java program to demonstrate// Reader reset() method  import java.io.*;import java.util.*;  class GFG {    public static void main(String[] args)    {          try {            String str = "GeeksForGeeks";              // Create a Reader instance            Reader reader                = new StringReader(str);              // Get the character            // to be read from the stream            int ch;              // Read the first 10 characters            // to this reader using read() method            // This will put the str in the stream            // till it is read by the reader            for (int i = 0; i < 10; i++) {                ch = reader.read();                System.out.print((char)ch);            }              System.out.println();              // reset the stream position            reader.reset();              // Read the 5 characters from marked position            // to this reader using read() method            for (int i = 0; i < 5; i++) {                ch = reader.read();                System.out.print((char)ch);            }        }        catch (Exception e) {            System.out.println(e);        }    }}

输出: