void close int available void mark(int readlimit) 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 int available void mark(int readlimit)