Java BufferedReader markSupported()方法

java.io.BufferedReader.markSupported() 用于测试输入流是否支持mark()和reset()方法。

1 语法

public boolean markSupported()

2 参数

无

3 返回值

如果支持mark()方法，则返回true。

4 示例 

package com.yiidian;

/**
 * 一点教程网： http://www.yiidian.com
 */
/**
 * java.io.BufferedReader.markSupported()方法的例子
 */
import java.io.BufferedReader;
import java.io.FileInputStream;
import java.io.InputStream;
import java.io.InputStreamReader;

public class Demo {
    public static void main(String[] args) throws Exception {
        InputStream is = null;
        InputStreamReader isr = null;
        BufferedReader br = null;

        try {
            // open input stream test.txt for reading purpose.
            is = new FileInputStream("d:/test.txt");

            // create new input stream reader
            isr = new InputStreamReader(is);

            // create new buffered reader
            br = new BufferedReader(isr);

            boolean bool = false;

            // returns true if the stream type supports mark
            bool = br.markSupported();

            System.out.println("Buffered reader supports mark : "+bool);

        } catch(Exception e) {
            e.printStackTrace();
        } finally {
            // releases resources associated with the streams
            if(is!=null)
                is.close();
            if(isr!=null)
                isr.close();
            if(br!=null)
                br.close();
        }
    }
}

假设test.txt内容如下：

ABCDE

输出结果为：

Buffered reader supports mark : true