Java Java.io.CharArrayWriter.reset()用法及代碼示例

描述

這個java.io.CharArrayWriter.reset()方法重置緩衝區，以便它可以再次使用而不會丟棄分配的緩衝區。

聲明

以下是聲明java.io.CharArrayWriter.reset()方法≫

public void reset()

參數

NA

返回值

該方法不返回任何值。

異常

NA

示例

下麵的例子展示了 java.io.CharArrayWriter.reset() 方法的用法。

package com.tutorialspoint;

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();
      }
   }
}

讓我們編譯並運行上麵的程序，這將產生以下結果——

Before Reset:
ABCDEFGHIJKLMNOPQRSTUVWXYZ
Reset is invoked
After reset:
1234567890