void close


描述

所述java.io.InputStream.close()方法关闭该流并释放与该流相关联的所有系统资源。

声明

以下是java.io.InputStream.close()方法的声明

public void close()

参数

NA

返回值

该方法不返回任何值

异常

IOException - 如果发生I / O错误。

实例

以下示例显示了java.io.InputStream.close()方法的用法。

package com.tutorialspoint;

import java.io.FileInputStream;
import java.io.InputStream;

public class InputStreamDemo {
   public static void main(String[] args) throws Exception {
      InputStream is = null;
      int i = 0;

      try {
         // new input stream created
         is = new FileInputStream("C://test.txt");

         // invoke available
         i = is.available();

         // number of bytes available is printed
         System.out.println(i);

         // releases any system resources associated with the stream
         is.close();

         // throws io exception on available() invocation
         i = is.available();
         System.out.println(i);

      } catch(Exception e) {
         // if any I/O error occurs
         System.out.print("Sorry, the input stream is closed");
      } finally {
         // releases system resources associated with this stream
         if(is!=null)
            is.close();
      }
   }
}

假设我们有一个文本文件c:/test.txt,它具有以下内容。此文件将用作示例程序的输入

ABCDEF

让我们编译并运行上面的程序,这将产生以下结果

6
Sorry, the input stream is closed