int read


描述

所述java.io.FilterReader.mark(INT readAheadLimit)方法读取单个字符和返回如在范围为0〜65535的整数。

声明

以下是java.io.FilterReader.read()方法的声明

public int read()

参数

NA

返回值

此方法返回字符读取,如0到65535之间的整数,如果到达流的末尾,则返回-1。

异常

IOException - 如果发生I / O错误。

实例

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

package com.tutorialspoint;

import java.io.FilterReader;
import java.io.Reader;
import java.io.StringReader;

public class FilterReaderDemo {
   public static void main(String[] args) throws Exception {
      FilterReader fr = null;
      Reader r = null;      
      int i = 0;
      char c;

      try {
         // create new reader
         r = new StringReader("ABCDEF");

         // create new filter reader
         fr = new FilterReader(r) {
         };

         // read till the end of the stream
         while((i = fr.read())!=-1) {

            // converts integer to character
            c = (char)i;

            // print
            System.out.println("Character read: "+c);
         }

      } catch(Exception e) {
         // if any I/O error occurs
         e.printStackTrace();
      } finally {
         // releases system resources associated with this stream
         if(r!=null)
            r.close();
         if(fr!=null)
            fr.close();
      }
   }
}

让我们编译并运行上面的程序,这将产生以下结果

Character read: A
Character read: B
Character read: C
Character read: D
Character read: E
Character read: F