Java PushbackInputStream markSupported()方法

java.io.PushbackInputStream.markSupported() 如果此输入流是否支持mark和reset方法的方法测试。

1 语法

public boolean markSupported()

2 参数

3 返回值

此方法返回false,因为这个类不支持mark和reset方法。

4 示例 

package com.yiidian;

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

public class Demo {
    public static void main(String[] args) {

        // declare a buffer and initialize its size:
        byte[] arrByte = new byte[1024];

        // create an array for our message
        byte[] byteArray = new byte[]{'H', 'e', 'l', 'l', 'o'};


        // create object of PushbackInputStream class for specified stream
        InputStream is = new ByteArrayInputStream(byteArray);
        PushbackInputStream pis = new PushbackInputStream(is);

        // check if mark is supported
        System.out.println("" + pis.markSupported());

        try {
            // read from the buffer one character at a time
            for (int i = 0; i < byteArray.length; i++) {

                // read a char into our array
                arrByte[i] = (byte) pis.read();

                // display the read byte
                System.out.print((char) arrByte[i]);
            }
        } catch (Exception ex) {
            ex.printStackTrace();
        }
    }
}

输出结果为:

false
Hello

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