OutputStreamWriter类flush()方法 (OutputStreamWriter Class flush() method)

• flush() method is available in java.io package.

  flush()方法在java.io包中可用。

• flush() method is used to flush this stream.

  flush()方法用于刷新此流。

• flush() method is a non-static method, it is accessible with the class object only and if we try to access the method with the class name then we will get an error.

  flush()方法是一种非静态方法，只能通过类对象访问，如果尝试使用类名称访问该方法，则会收到错误消息。

• flush() method may throw an exception at the time of flushing the stream.

  flush()方法在刷新流时可能会引发异常。

  IOException: This exception may throw when getting any input/output error while performing.

  IOException ：在执行过程中遇到任何输入/输出错误时，可能引发此异常。

Syntax:

句法：

    public void flush();

Parameter(s):

参数：

• It does not accept any parameter.

  它不接受任何参数。

Return value:

返回值：

The return type of the method is void, it returns nothing.

该方法的返回类型为void ，不返回任何内容。

Example:

例：

// Java program to demonstrate the example 
// of void flush() method 
// of OutputStreamWriter
import java.io.*;
public class FlushOfOSW {
public static void main(String[] args) throws Exception {
OutputStream os_stm = null;
OutputStreamWriter osw_stm = null;
InputStream is_stm = null;
int val = 65;
try {
// Instantiates FileOutputStream and 
// FileInputStream and OutputStreamWriter
os_stm = new FileOutputStream("D:\\includehelp.txt");
osw_stm = new OutputStreamWriter(os_stm);
// Loop to write byte to the stream
for (int i = 0; i < 3; ++i) {
osw_stm.write(val);
val++;
}
// By using flush() method is to
// flush the stream
osw_stm.flush();
System.out.println("Stream Flushed...");
is_stm = new FileInputStream("D:\\includehelp.txt");
// Loop to read byte from the stream
for (int i = 0; i < 3; ++i) {
char ch = (char) is_stm.read();
System.out.println("ch: " + ch);
}
osw_stm.close();
System.out.println("Stream Closed Successfully....");
} catch (Exception ex) {
System.out.println(ex.toString());
} finally {
// with the help of this block is to
// free all necessary resources linked
// with the stream
if (is_stm != null) {
is_stm.close();
if (os_stm != null) {
os_stm.close();
}
}
}
}
}

Output

输出量

Stream Flushed...
ch: A
ch: B
ch: C
Stream Closed Successfully....

翻译自: https://www.includehelp.com/java/outputstreamwriter-flush-method-with-example.aspx