inputstream示例

InputStream類的available()方法 (InputStream Class available() method)

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

  available()方法在java.io包中可用。

• available() method is used to return the number of available bytes left for reading from this InputStream without blocking by the next call of the method from this InputStream.

  available()方法用于返回可從此InputStream讀取的剩余可用字節(jié)數(shù)，而不會被該InputStream的下一次調(diào)用阻塞。

• available() 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.

  available()方法是一種非靜態(tài)方法，只能通過類對象訪問，如果嘗試使用類名稱訪問該方法，則會收到錯誤消息。

• available() method may throw an exception at the time of returning available bytes.

  available()方法在返回可用字節(jié)時可能會引發(fā)異常。

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

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

Syntax:

句法：

public int available();

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 int, it returns the number of bytes left that can be read.

該方法的返回類型為int ，它返回可以讀取的剩余字節(jié)數(shù)。

Example:

例：

// Java program to demonstrate the example // of int available() method of InputStreamimport java.io.*;public class AvailableOfIS {public static void main(String[] args) throws Exception {InputStream is_stm = null;int val = 0;try {// Instantiates FileInputStreamis_stm = new FileInputStream("D:\\includehelp.txt");// Loop to read until available// bytes leftwhile ((val = is_stm.read()) != -1) {// By using available() method is to// return the available bytes to be readint avail_bytes = is_stm.available();// Display corresponding byte valuebyte b = (byte) val;// Display value of avail_bytes and bSystem.out.print("is_stm.available(): " + avail_bytes);System.out.println(" : " + "byte: " + b);}} 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 (is_stm != null) {is_stm.close();}}} }

Output

輸出量

is_stm.available(): 3 : byte: 74 is_stm.available(): 2 : byte: 65 is_stm.available(): 1 : byte: 86 is_stm.available(): 0 : byte: 65

翻譯自: https://www.includehelp.com/java/inputstream-available-method-with-example.aspx

inputstream示例

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