Java PushbackReader类示例

PushbackReader是一个字符流读取器，允许将一个或多个字符推回到流中。

以下是PushbackReader类的示例。文件：PushbackReaderExample.java –

package com.yiibai.tutorial.io;  import java.io.IOException; import java.io.PushbackReader; import java.io.StringReader;  /**  * @author yiibai  */ public class PushbackReaderExample {     public static void main(String[] args) {         String input = "This is an example of PushbackReader.";         StringReader stringReader = null;         PushbackReader pushbackReader = null;         try {             stringReader = new StringReader(input);             pushbackReader = new PushbackReader(stringReader, 20);              // Read first character             int ch = pushbackReader.read();             System.out.println((char) ch);              // Push back first character             pushbackReader.unread(ch);              char[] c = new char[4];             // Get first four characters             pushbackReader.read(c);             System.out.println(new String(c));              // Push back first four characters             pushbackReader.unread(c, 0, 4);              // Read all characters             c = new char[input.length()];             pushbackReader.read(c);             System.out.println(new String(c, 0, input.length()));          } catch (IOException e) {             e.printStackTrace();         } finally {             try {                 if (pushbackReader != null) {                     pushbackReader.close();                 }             } catch (IOException e) {                 e.printStackTrace();             }         }     } } 

执行上面示例代码，得到以下结果：

T This This is an example of PushbackReader.