Java BufferedInputStream close()用法及代碼示例

Java中BufferedInputStream類的close()方法關閉輸入流並釋放與之關聯的所有係統資源。調用close()方法後，將禁止從任何輸入文件讀取數據，並且係統將引發IOException。為了解決該問題，用戶可以使用try-catch塊來捕獲任何此類異常並拋出正確的指令。

用法:

public void close()

參數：此方法不接受任何參數。

返回值：此方法不返回任何值。

重寫：該方法在類FilterInputStream中被close覆蓋。

異常：如果發生任何輸入輸出錯誤，則此方法將引發IOException。

以下示例程序旨在說明IO包中BufferedInputStream類中的close()方法：

程序1:假設存在文件“c:/demo.txt”。

// Java program to illustrate 
// BufferedInputStream.close() method 
  
import java.io.*; 
public class GFG { 
    public static void main(String[] args) 
        throws IOException 
    { 
  
        // Create input stream 'demo.txt' 
        // for reading containing 
        // text "GEEKSFORGEEKS" 
        FileInputStream inputStream 
            = new FileInputStream("c:/demo.txt"); 
  
        // Convert inputStream to 
        // bufferedInputStream 
        BufferedInputStream buffInputStr 
            = new BufferedInputStream(inputStream); 
  
        // Get the number of bytes available 
        // to read using available() method 
        int rem_byte = buffInputStr.available(); 
  
        // Number of bytes available is printed 
        System.out.println( 
            "Remaining Byte:" + rem_byte); 
  
        // Close the file 
        buffInputStr.close(); 
    } 
}

輸出：

Remaining Byte:13

程序2:假設存在文件“c:/demo.txt”。

// Java program to illustrate 
// BufferedInputStream.close() method 
  
import java.io.*; 
public class GFG { 
    public static void main(String[] args) 
        throws IOException 
    { 
        try { 
  
            // create input stream 'demo.txt' 
            // for reading containing 
            // text "GEEKS" 
            FileInputStream inputStream 
                = new FileInputStream( 
                    "c:/demo.txt"); 
  
            // convert inputStream to 
            // bufferedInputStream 
            BufferedInputStream buffInputStr 
                = new BufferedInputStream( 
                    inputStream); 
  
            // get the number of bytes available 
            // to read using available() method 
            int rem_byte 
                = buffInputStr.available(); 
  
            // number of bytes available is printed 
            System.out.println(rem_byte); 
  
            // close the file 
            buffInputStr.close(); 
  
            // now throws io exception 
            // if available() is invoked 
            // after close() 
            rem_byte = buffInputStr.available(); 
  
            System.out.println(rem_byte); 
        } 
        catch (IOException e) { 
            // exception occurred. 
            System.out.println( 
                "Error:Sorry 'buffInputStr'"
                + " is closed"); 
        } 
    } 
}

輸出：

5
Error:Sorry 'buffInputStr' is closed

參考文獻： https://docs.oracle.com/javase/10/docs/api/java/io/BufferedInputStream.html#close()

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注：本文由純淨天空篩選整理自pp_pankaj大神的英文原創作品 BufferedInputStream close() method in Java with Examples。非經特殊聲明，原始代碼版權歸原作者所有，本譯文未經允許或授權，請勿轉載或複製。