pipedreader_Java PipedReader ready（）方法与示例

pipedreader

PipedReader类ready()方法 (PipedReader Class ready() method)

ready() method is available in java.io package.
ready()方法在java.io包中可用。
ready() method is used to check whether this PipedReader stream is ready to be read or not.
ready()方法用于检查此PipedReader流是否已准备好被读取。
ready() 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.
ready()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。
ready() method may throw an exception at the time of checking the state of the stream.
在检查流的状态时， ready()方法可能会引发异常。

IOException: This exception may throw when getting any input/output error.
IOException ：遇到任何输入/输出错误时，可能引发此异常。

Syntax:

句法：

    public boolean ready();

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 boolean, it returns true when this stream is ready to read (i.e. when input is available for next read() without blocking) otherwise it returns false.

该方法的返回类型为boolean ，当此流准备好读取时(即，当输入可用于下一个read()而不阻塞时)返回true，否则返回false。

Example:

例：

// Java program to demonstrate the example 
// of boolean ready() method of PipedReader
import java.io.*;
public class ReadyOfPR {
public static void main(String[] args) throws Exception {
try {
// Instantiates PipedReader and PipedWriter
PipedWriter pipe_w = new PipedWriter();
PipedReader pipe_r = new PipedReader();
pipe_r.connect(pipe_w);
// By using ready() method is to check whether
// this stream pipe_r is ready to be read or not
boolean status = pipe_r.ready();
System.out.println("pipe_r.ready(): " + status);
// By using close() method is to close
// the stream
pipe_w.close();
pipe_w.close();
} catch (Exception ex) {
System.out.println(ex.toString());
}
}
}

Output

输出量