java reader

Reader類(lèi)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()方法用于檢查此流是否已準(zhǔn)備好被讀取。

• 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()方法是一種非靜態(tài)方法，只能通過(guò)類(lèi)對(duì)象訪(fǎng)問(wèn)，如果嘗試使用類(lèi)名稱(chēng)訪(fǎng)問(wèn)該方法，則會(huì)收到錯(cuò)誤消息。

• ready() method may throw an exception at the time of checking the state of the stream.

  在檢查流的狀態(tài)時(shí)， ready()方法可能會(huì)引發(fā)異常。

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

  IOException：遇到任何輸入/輸出錯(cuò)誤時(shí)，可能引發(fā)此異常。

Syntax:

句法：

public boolean ready();

Parameter(s):

參數(shù)：

• It does not accept any parameter.

  它不接受任何參數(shù)。

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.

該方法的返回類(lèi)型為boolean ，當(dāng)此流準(zhǔn)備就緒時(shí)(即輸入數(shù)據(jù)可用于下一次讀取)返回true，否則返回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

輸出量

r_stm.ready(): true

翻譯自: https://www.includehelp.com/java/reader-ready-method-with-example.aspx

java reader

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