例子
以下示例显示java.io.RandomAccessFile.read()方法的用法。
package com.jc2182;
import java.io.*;
public class RandomAccessFileDemo {
public static void main(String[] args) {
try {
String s = "Hello World";
// create a new RandomAccessFile with filename test
RandomAccessFile raf = new RandomAccessFile("c:/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();
}
}
}
假设我们有一个文本文件c:/test.txt,其内容如下。该文件将用作我们示例程序的输入 -
让我们编译并运行以上程序,这将产生以下结果-
Hello World
This is an example