Java Java.io.FilterReader.skip()用法及代码示例

描述

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

声明

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

public long skip(long n)

参数

n− 从流中跳过 n 个字符。

返回值

该方法返回实际跳过的字符数。

异常

IOException− 如果发生 I/O 错误。

示例

下面的例子展示了 java.io.FilterReader.skip(long n) 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;
      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();
      }
   }
}

让我们编译并运行上面的程序，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