Java RandomAccessFile writeChars()方法

java.io.RandomAccessFile.writeChars(String s) 方法将一个字符串写入该文件为一个字符序列。每个字符都使用writeChar方法写入数据输出流。写入从文件指针的当前位置。

1 语法

public final void writeChars(String s)

2 参数

s：要写入的字符串值。

3 返回值

无

4 示例 

package com.yiidian;

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

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

        try {
            String s = "Hello World";

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

            // write a char in the file
            raf.writeChars(s);

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

            // read chars
            for (int i = 0; i < 11; i++) {
                System.out.print("" + raf.readChar());
            }

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

            // change the line for better view
            System.out.println();

            // write a char at the start
            raf.writeChars("This is an example");

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

            // read chars
            for (int i = 0; i < 18; i++) {
                System.out.print("" + raf.readChar());
            }

        } catch (IOException ex) {
            ex.printStackTrace();
        }
    }
}

假设test.txt文件内容如下：

ABCDE  

输出结果为：

Hello World
This is an example