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 {
float f = 1847.4986f;
// create a new RandomAccessFile with filename test
RandomAccessFile raf = new RandomAccessFile("c:/test.txt", "rw");
// write a float in the file
raf.writeFloat(f);
// set the file pointer at 0 position
raf.seek(0);
// read float
System.out.println("" + raf.readFloat());
// set the file pointer at 0 position
raf.seek(0);
// write a float at the start
raf.writeFloat(473.5645f);
// set the file pointer at 0 position
raf.seek(0);
// read float
System.out.println("" + raf.readFloat());
} 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-
1847.4987
473.5645