java reader_Java Reader ready（）方法与示例

java reader

Reader类ready()方法 (Reader 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 stream is ready to be read or not.

  ready()方法用于检查此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 (i.e. input data is available for the next read) otherwise it returns false.

该方法的返回类型为boolean ，当此流准备就绪时(即输入数据可用于下一次读取)返回true，否则返回false。

Example:

例：

// Java program to demonstrate the example // of boolean ready() method of Readerimport java.io.*;public class ReadyOfR {public static void main(String[] args) throws Exception {Reader r_stm = null;try {// Instantiates Readerr_stm = new StringReader("JavaWorld!!!!");// By using ready() method is to// check whether this stream r_str// is ready to be read or notboolean status = r_stm.ready();System.out.println("r_stm.ready(): " + status);} catch (Exception ex) {System.out.println(ex.toString());} finally {// with the help of this block is to// free all necessary resources linked// with the streamif (r_stm != null) {r_stm.close();}}} }

Output

输出量

r_stm.ready(): true

翻译自: https://www.includehelp.com/java/reader-ready-method-with-example.aspx

java reader

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