Java BufferedInputStream close()用法及代码示例

Java中BufferedInputStream类的close()方法关闭输入流并释放与之关联的所有系统资源。调用close()方法后，将禁止从任何输入文件读取数据，并且系统将引发IOException。为了解决该问题，用户可以使用try-catch块来捕获任何此类异常并抛出正确的指令。

用法:

public void close()

参数：此方法不接受任何参数。

返回值：此方法不返回任何值。

重写：该方法在类FilterInputStream中被close覆盖。

异常：如果发生任何输入输出错误，则此方法将引发IOException。

以下示例程序旨在说明IO包中BufferedInputStream类中的close()方法：

程序1:假设存在文件“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(); 
    } 
}

输出：

Remaining Byte:13

程序2:假设存在文件“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"); 
        } 
    } 
}

输出：

5
Error:Sorry 'buffInputStr' is closed

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

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注：本文由纯净天空筛选整理自pp_pankaj大神的英文原创作品 BufferedInputStream close() method in Java with Examples。非经特殊声明，原始代码版权归原作者所有，本译文未经允许或授权，请勿转载或复制。