Java FilterReader skip()用法及代码示例

FilterReader类skip()方法

• skip() 方法可在java.io包。
• skip() 方法用于从该 FilterReader 中跳过给定数量的字符。
• skip() 方法是一个非静态方法，它只能通过类对象访问，如果我们尝试使用类名访问方法，那么我们将得到一个错误。
• skip() 方法可能会在跳过字符时抛出异常。
  IOException: 获取任何输入/输出错误时可能会抛出此异常。

用法:

    public long skip(long number);

参数：

• long number– 表示要跳过的字符数。

返回值：

该方法的返回类型是long，它返回跳过的确切字符数。

例：

// Java program to demonstrate the example 
// of long skip(long number) method of FilterReader

import java.io.*;

public class SkipOfFR {
 public static void main(String[] args) throws Exception {
  Reader r_stm = null;
  FilterReader fr_stm = null;

  try {
   // Instantiates StringReader and 
   // FilterReader
   r_stm = new StringReader("Java World!!!!");
   fr_stm = new FilterReader(r_stm) {};

   // Loop to read until available
   // bytes left
   for (int val = 0; val <= 6; ++val) {

    // Read corresponding char value
    char ch = (char) fr_stm.read();

    // Display value of ch
    System.out.println("ch:" + ch + " ");

    // By using skip() method is
    // to skip 1 bytes of char 
    // from fr_stm	    
    long skip = fr_stm.skip(1);
    System.out.println("fr_stm.skip(1):" + skip);
   }
  } catch (Exception ex) {
   System.out.println(ex.toString());

  } finally {
   // with the help of this block is to
   // free all necessary resources linked
   // with the stream
   if (fr_stm != null) {
    fr_stm.close();
   }
  }
 }
}

输出

ch:J 
fr_stm.skip(1):1
ch:v 
fr_stm.skip(1):1
ch:  
fr_stm.skip(1):1
ch:o 
fr_stm.skip(1):1
ch:l 
fr_stm.skip(1):1
ch:! 
fr_stm.skip(1):1
ch:! 
fr_stm.skip(1):1