Java FileInputStream markSupported()方法

java.io.FilterInputStream.markSupported() 此方法测试此输入流是否支持mark和reset方法。

1 语法

public boolean markSupported()

2 参数

3 返回值

如果流类型支持mark和reset方法,则该方法返回true。

4 示例 

package com.yiidian;

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

public class Demo {
    public static void main(String[] args) throws Exception {
        InputStream is = null;
        FilterInputStream fis = null;
        boolean bool = false;

        try {
            // create input streams
            is = new FileInputStream("d://test.txt");
            fis = new BufferedInputStream(is);

            // tests if the input stream supports mark() and reset()
            bool = fis.markSupported();

            // prints
            System.out.print("Supports mark and reset methods: "+bool);

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

假设test.txt内容如下:

ABCDE

输出结果为:

Supports mark and reset methods: true

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