Java Java.io.CharArrayWriter.reset() 方法

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  描述

  java.io.CharArrayWriter.reset()方法重置缓冲区，以便可以再次使用它而不会丢弃分配的缓冲区。
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  声明

  以下是java.io.CharArrayWriter.reset()方法的声明-

   public void reset()

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  参数

  不适用
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  返回值

  该方法不返回任何值。
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  异常

  不适用
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  例子

  以下示例显示java.io.CharArrayWriter.reset()方法的用法。

   
  package com.jc2182;
  import java.io.CharArrayWriter;
  
  public class CharArrayWriterDemo {
     public static void main(String[] args) {      
        CharArrayWriter chw = null;
        
        try {
           // create character array writer
           chw = new CharArrayWriter();
           
           // declare character sequence
           CharSequence csq = "ABCDEFGHIJKLMNOPQRSTUVWXYZ";
           
           // append character sequence to the writer
           chw.append(csq);
           
           System.out.println("Before Reset:");
           
           // print  character sequence
           System.out.println(csq);
           
           // invoke reset()
           chw.reset();
           System.out.println("Reset is invoked");
           
           csq = "1234567890";
           
           chw.append(csq);
           
           System.out.println("After reset:");
           
           // print character sequence
           System.out.println(chw.toString());
                 
        } catch(Exception e) {
           // for any error
           e.printStackTrace();
        } finally {
           // releases all system resources from writer
           if(chw!=null)
              chw.close();
        }
     }
  }

  让我们编译并运行以上程序，这将产生以下结果-

   Before Reset: ABCDEFGHIJKLMNOPQRSTUVWXYZ Reset is invoked After reset: 1234567890