Java.io.FilterReader.skip() 方法

描述

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

声明

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

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) 方法的使用。

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，这将产生下面的结果 −

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