Java PushbackReader类

Java PushbackReader类是字符流读取器。它用于将字符推回流中并覆盖FilterReader类。

类声明

我们来看一下java.io.PushbackReader类的声明：

public class PushbackReader extends FilterReader

类方法

PushbackReader类的示例

import java.io.*;
public class ReaderExample{
	public static void main(String[] args) throws Exception {
        char ary[] = {'1', '-', '-', '2', '-', '3', '4', '-', '-', '-', '5', '6'};
        CharArrayReader reader = new CharArrayReader(ary); 
        PushbackReader push = new PushbackReader(reader);
        int i;
            while( (i = push.read())!= -1) {
                if(i == '-') {
            	    int j;
                    if( (j = push.read()) == '-'){
                         System.out.print("#*");
                    }else {
                    	push.unread(j); // push back single character
                        System.out.print((char)i);
                    }
	            }else {
	                    System.out.print((char)i);
	            }
           }       
    }
}

输出量

1#*2-34#*-56