CharArrayReader类mark()方法 (CharArrayReader Class mark() method)
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 the stream and whenever the call to reset() method so it reset the stream to the position set by the most recent call of mark() method.
mark()方法用于标记流中的当前位置，并在每次调用reset()方法时将其重置为由最近调用mark()方法设置的位置。
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 marking the stream.
mark()方法在标记流时可能会引发异常。
IOException: This exception may throw when the given parameter is not valid.
IOException ：如果给定参数无效，则可能引发此异常。
Syntax:
句法：
public void mark(int r_limit);
Parameter(s):
参数：
int r_limit – represents the limit on the number of character that can be read while preserving the mark.
int r_limit –表示保留标记时可以读取的字符数限制。
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
// CharArrayReader
import java.io.*;
public class MarkOfCAR {
public static void main(String[] args) {
CharArrayReader car_stm = null;
char[] c_arr = {
'a',
'b',
'c',
'd'
};
try {
// Instantiates CharArrayReader
car_stm = new CharArrayReader(c_arr);
// By using read() method isto
// read the character from car_stm
int i1 = car_stm.read();
int i2 = car_stm.read();
int i3 = car_stm.read();
int i4 = car_stm.read();
System.out.println("i1: " + i1);
// By using mark() method isto
// set the current position in this
// car_stm
System.out.println("car_stm.mark(0): ");
car_stm.mark(0);
System.out.println("i2: " + i2);
System.out.println("i3: " + i3);
// By using reset() method isto
// reset the stream to the position
// set by the call mark() method
System.out.println("car_stm.reset(): ");
car_stm.reset();
System.out.println("i2: " + i2);
System.out.println("i3: " + i3);
System.out.println("i4: " + i4);
} catch (IOException e) {
System.out.print("Stream closed!!!!");
} finally {
// Free all system resources linked
// with the stream after closing
// the stream
if (car_stm != null)
car_stm.close();
}
}
}
Output
输出量
i1: 97
car_stm.mark(0):
i2: 98
i3: 99
car_stm.reset():
i2: 98
i3: 99
i4: 100
翻译自: https://www.includehelp.com/java/chararrayreader-mark-method-with-example.aspx
