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mark() method is available in java.io package.
mark()方法在java.io包中可用。
mark() method is used to mark the current position in this stream and whenever we call reset() method so it will reset the stream to the given point (read_from_here).
mark()方法用于标记此流中的当前位置,并且每当我们调用reset()方法时,都会将流重置到给定点(read_from_here)。
mark() 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.
mark()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。
mark() method may throw an exception at the time of setting a limit.
设置限制时, mark()方法可能会引发异常。
Syntax:
句法:
public void mark(int read_from_here);
Parameter(s):
参数:
int read_from_here – represents the number of bytes to read during mark() preserves.
int read_from_here –表示mark()保留期间要读取的字节数。
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 read_from_here) method of // BufferedReaderimport java.io.*;public class MarkBR { public static void main(String[] args) throws Exception { // To open text file by using // FileInputStream FileInputStream fis = new FileInputStream("e:/includehelp.txt"); // Instantiates InputStreamReader InputStreamReader inp_r = new InputStreamReader(fis); // Instantiates BufferedReader BufferedReader buff_r = new BufferedReader(inp_r); // Read character from the stream char ch1 = (char) buff_r.read(); char ch2 = (char) buff_r.read(); char ch3 = (char) buff_r.read(); System.out.println("ch1: " + ch1); System.out.println("ch2 : " + ch2); // By using mark() method isto // set the limit the number of byte // to be read System.out.println("buff_r.mark(5): "); buff_r.mark(5); System.out.println("ch3: " + ch3); // reset stream by using reset() System.out.println("buff_r.reset(): "); buff_r.reset(); // Read from the stread char ch4 = (char) buff_r.read(); char ch5 = (char) buff_r.read(); // Display character System.out.println("ch4: " + ch4); System.out.println("ch5: " + ch5); fis.close(); inp_r.close(); buff_r.close(); }}
Output
输出量
ch1: Hch2 : ebuff_r.mark(5):ch3: lbuff_r.reset():ch4: lch5: o
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