Java FilterInputStream close()用法及代码示例

FilterInputStream类close()方法

• close() 方法可在java.io包。
• close() 方法用于关闭此 FilterInputStream 并释放与此流链接的所有系统资源。
• close() 方法是一个非静态方法，它只能通过类对象访问，如果我们尝试使用类名访问方法，那么我们将得到一个错误。
• close() 方法可能会在关闭流时抛出异常。
  IOException:在执行时遇到任何输入/输出错误时可能会抛出此异常。

用法:

    public void close();

参数：

• 它不接受任何参数。

返回值：

该方法的返回类型是void，它什么都不返回。

例：

// Java program to demonstrate the example 
// of void close() method of FilterInputStream

import java.io.*;

public class CloseOfFIS {
 public static void main(String[] args) throws Exception {
  FileInputStream fis_stm = null;
  FilterInputStream fil_stm = null;

  try {
   // Instantiates FileInputStream and 
   // FilterInputStream
   fis_stm = new FileInputStream("D:\\includehelp.txt");
   fil_stm = new BufferedInputStream(fis_stm);

   // By using read() method is to
   // read the character from fil_stm
   fil_stm.read();

   // By using close() method is to
   // close this fil_stm stream
   fil_stm.close();

   // when we call read() method
   // after closing the stream will
   // result an exception
   fil_stm.read();
  } catch (Exception ex) {
   System.out.println("Stream Closed Before!!!");
  } finally {
   // with the help of this block is to
   // free all necessary resources linked
   // with the stream
   if (fis_stm != null) {
    fis_stm.close();

    if (fil_stm != null) {
     fil_stm.close();
    }
   }
  }
 }
}

输出

Stream Closed Before!!!