Java Java.io.FilterReader.skip() 方法

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  描述

  java.io.FilterReader.skip(long n)方法跳过n个字符。
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  声明

  以下是java.io.FilterReader.skip(long n)方法的声明-

   public long skip(long n)

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  参数

  n从流中跳过n个字符。
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  返回值

  该方法返回实际跳过的字符数。
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  异常

  IOException如果发生I / O错误。
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  例子

  以下示例显示java.io.FilterReader.skip（long n）方法的用法。

   
  package com.jc2182; 
  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;
        long l = 0l;
        char c;
        
        try {
           // create new reader
           r = new StringReader("ABCDEFGHIJKLMNOPQRSTUVWXYZ");
            
           // create new filter reader
           fr = new FilterReader(r) {
           };
           
           // read till the end of the filter reader
           while((i = fr.read())!=-1) {
           
              // convert integer to character
              c = (char)i;
              
              // prints
              System.out.println("Character read: "+c);
              
              // number of characters actually skipped
              l = fr.skip(2);
              
              // prints
              System.out.println("Character skipped: "+l);
           }
           
        } 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();
        }
     }
  }
  

  让我们编译并运行以上程序，这将产生以下结果-

   
  Character read: A
  Character skipped: 2
  Character read: D
  Character skipped: 2
  Character read: G
  Character skipped: 2
  Character read: J
  Character skipped: 2
  Character read: M
  Character skipped: 2
  Character read: P
  Character skipped: 2
  Character read: S
  Character skipped: 2
  Character read: V
  Character skipped: 2
  Character read: Y
  Character skipped: 1