Java FileOutputStream flush()方法

java.io.FilterOutputStream.flush() 用于刷新此输出流，并强制将所有缓冲的输出字节写出到该流中。

1 语法

public void flush()

2 参数

无

3 返回值

无

4 示例 

package com.yiidian;

/**
 * 一点教程网： http://www.yiidian.com
 */
/**
 * java.io.FilterOutputStream.flush()方法的例子
 */
import java.io.FileInputStream;
import java.io.FileOutputStream;
import java.io.FilterOutputStream;
import java.io.IOException;
import java.io.OutputStream;

public class Demo {
    public static void main(String[] args) throws Exception {
        OutputStream os = null;
        FilterOutputStream fos = null;
        FileInputStream fis = null;
        int i = 0;
        char c;

        try {
            // create output streams
            os = new FileOutputStream("d://test.txt");
            fos = new FilterOutputStream(os);

            // writes byte to the output stream
            fos.write(65);

            // forces byte contents to written out to the stream
            fos.flush();

            // create output streams
            fis = new FileInputStream("d://test.txt");

            // read byte
            i=fis.read();

            // convert integer to characters
            c = (char)i;

            // prints
            System.out.print("Character read: "+ c);

        } catch(IOException e) {
            // if any I/O error occurs
            System.out.print("Close() is invoked prior to write()");
        } finally {
            // releases any system resources associated with the stream
            if(os!=null)
                os.close();
            if(fos!=null)
                fos.close();
        }
    }
}

输出结果为：

Character read: A