boolean markSupported

描述

所述java.io.CharArrayReader.markSupported（）方法测试流支持标记（）。char数组读取器支持mark（）方法。

声明

以下是java.io.CharArrayReader.markSupported（）方法的声明

public boolean markSupported()

参数

NA

返回值

如果流支持mark（）调用，则该方法返回true。

异常

NA

实例

以下示例显示了java.io.CharArrayReader.markSupported（）方法的用法。

package com.tutorialspoint;

  import java.io.CharArrayReader;
  import java.io.IOException;

  public class CharArrayReaderDemo {
     public static void main(String[] args) {      CharArrayReader car = null;
        char[] ch = {'A', 'B', 'C', 'D', 'E'};

        try {
           // create new character array reader
           car = new CharArrayReader(ch);

           // verifies if the stream support mark() method
           boolean bool = car.markSupported();
           System.out.println("Is mark supported : "+bool);
           System.out.println("Proof:");

           // read and print the characters from the stream
           System.out.println(car.read());
           System.out.println(car.read());

           // mark() is invoked at this position
           car.mark(0);
           System.out.println("Mark() is invoked");
           System.out.println(car.read());
           System.out.println(car.read());

           // reset() is invoked at this position
           car.reset();
           System.out.println("Reset() is invoked");
           System.out.println(car.read());
           System.out.println(car.read());
           System.out.println(car.read());

        } catch(IOException e) {
           // if I/O error occurs
           e.printStackTrace();
        } finally {
           // releases any system resources associated with the stream
           if(car!=null)
              car.close();
        }
     }
  }

让我们编译并运行上面的程序，这将产生以下结果

Is mark supported : true
  Proof:
  65
  66
  Mark() is invoked
  67
  68
  Reset() is invoked
  67
  68
  69