ObjectInputStream available()方法

java.io.ObjectInputStream.available() 方法返回可无阻塞读取的字节数。

1 语法

public int available()

2 参数

无

3 返回值

返回可用字节数。

4 示例 

package com.yiidian;

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

public class Demo {
    public static void main(String[] args) {
        try {
            // create a new file with an ObjectOutputStream
            FileOutputStream out = new FileOutputStream("test.txt");
            ObjectOutputStream oout = new ObjectOutputStream(out);

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

            // create an ObjectInputStream for the file we created before
            ObjectInputStream ois =  new ObjectInputStream(new FileInputStream("test.txt"));

            // check how many bytes are available
            System.out.println("" + ois.available());
        } catch (Exception ex) {
            ex.printStackTrace();
        }

    }
}

输出结果为：

13