Java PushbackInputStream mark()方法

java.io.PushbackInputStream.mark(int readlimit) 方法标志着这个输入流中的当前位置,但对于PushbackInputStream它什么都不做。

1 语法

public void mark(int readlimit)

2 参数

readlimit:标记位置变为无效之前可以读取的字节的最大限制。

3 返回值

4 示例 

package com.yiidian;

/**
 * 一点教程网: http://www.yiidian.com
 */
/**
 * java.io.PushbackInputStream.mark(int readlimit)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);

        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]);
            }

            // mark this position, but it does nothing for this class
            pis.mark(5);
        } catch (Exception ex) {
            ex.printStackTrace();
        }
    }
}

输出结果为:

Hello

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