Java 中的 BufferedInputStream close()方法，示例
原文:https://www . geeksforgeeks . org/bufferedinputstream-close-method-in-Java-with-examples/
Java 中 BufferedInputStream 类的 close() 方法关闭输入流并释放与之相关的任何系统资源。一旦调用 close()方法，读取任何输入文件都将被禁止，系统将抛出一个 IOException。为了解决这个问题，用户可以使用 try-catch 块来捕获任何这样的异常并抛出一个正确的指令。
语法:
public void close()
参数:此方法不接受任何参数。
返回值:此方法不返回值。
覆盖:该方法被在类中关闭**所覆盖 FilterInputStream 。
异常:如果出现输入输出错误，该方法抛出 IOException 。
下面的程序说明了 IO 包中 BufferedInputStream 类的 close()方法:
程序 1: 假设文件“c:/demo.txt”存在。
// 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
程序二:假设文件“c:/demo.txt”存在。
// 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()
版权属于：月萌API www.moonapi.com，转载请注明出处
