PushbackInputStream类markSupported()方法 (PushbackInputStream Class markSupported() method)

• markSupported() method is available in java.io package.

  markSupported()方法在java.io包中可用。

• markSupported() method is used to check whether this stream supports mark(), reset() or not.

  markSupported()方法用于检查此流是否支持mark()，reset()。

• markSupported() 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.

  markSupported()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。

• markSupported() method does not throw an exception at the time of checking supporting methods.

  在检查支持方法时， markSupported()方法不会引发异常。

Syntax:

句法：

public boolean markSupported();

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 boolean, it returns true when this stream support mark() method otherwise it returns false.

方法的返回类型为boolean ，当此流支持mark()方法时返回true，否则返回false。

Example:

例：

// Java program to demonstrate the example // of boolean markSupported() method of// PushbackInputStreamimport java.io.*;public class MarkSupportedOfPBIS {
       public static void main(String[] args) throws Exception {
           byte[] b_arr = {
               97,            98,            99,            100        };        InputStream is_stm = null;        PushbackInputStream pb_stm = null;        try {
               // Instantiates ByteArrayOutputStream and PushbackInputStream            is_stm = new ByteArrayInputStream(b_arr);            pb_stm = new PushbackInputStream(is_stm);            // By using markSupported() method is to            // check whether this stream supports            // mark() method or not            boolean status = pb_stm.markSupported();            System.out.println("pb_stm.markSupported(): " + status);        } catch (Exception ex) {
               System.out.println(ex.toString());        } finally {
               if (is_stm != null)                is_stm.close();            if (pb_stm != null)                pb_stm.close();        }    }}

Output

输出量

pb_stm.markSupported(): false

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