Java RandomAccessFile length()方法

java.io.RandomAccessFile.length() 方法返回此文件的长度。

1 语法

public long length()

2 参数

无

3 返回值

此方法返回当前文件的长度，以字节为单位。

4 示例 

package com.yiidian;

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

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

        try {
            // create a new RandomAccessFile with filename test
            RandomAccessFile raf = new RandomAccessFile("d:/test.txt", "rw");

            // write something in the file
            raf.writeUTF("Hello World");

            // set the file pointer at 0 position
            raf.seek(0);

            // read and print the contents of the file
            System.out.println("" + raf.readUTF());

            // print the length of the file
            System.out.println("" + raf.length());

            // write something more in the file
            raf.writeUTF("This is an example");

            // print the length of the file
            System.out.println("" + raf.length());
        } catch (IOException ex) {
            ex.printStackTrace();
        }
    }
}

输出结果为：

Hello World
13
33