HDOJ/HDU 1088 Write a simple HTML Browser(HTML字符串)

Problem Description
If you ever tried to read a html document on a Macintosh, you know how hard it is if no Netscape is installed.
Now, who can forget to install a HTML browser? This is very easy because most of the times you don’t need one on a MAC because there is a Acrobate Reader which is native to MAC. But if you ever need one, what do you do?
Your task is to write a small html-browser. It should only display the content of the input-file and knows only the html commands (tags) <br> which is a linebreak and <hr> which is a horizontal ruler. Then you should treat all tabulators, spaces and newlines as one space and display the resulting text with no more than 80 characters on a line.

Input
The input consists of a text you should display. This text consists of words and HTML tags separated by one or more spaces, tabulators or newlines.
A word is a sequence of letters, numbers and punctuation. For example, “abc,123” is one word, but “abc, 123” are two words, namely “abc,” and “123”. A word is always shorter than 81 characters and does not contain any ‘<’ or ‘>’. All HTML tags are either <br> or <hr>.

Output
You should display the the resulting text using this rules:
. If you read a word in the input and the resulting line does not get longer than 80 chars, print it, else print it on a new line.
. If you read a <br> in the input, start a new line.
. If you read a <hr> in the input, start a new line unless you already are at the beginning of a line, display 80 characters of ‘-’ and start a new line (again).
The last line is ended by a newline character.

Sample Input

Hallo, dies ist eine 
ziemlich lange Zeile, die in Html
aber nicht umgebrochen wird.
<br>
Zwei <br> <br> produzieren zwei Newlines. 
Es gibt auch noch das tag <hr> was einen Trenner darstellt.
Zwei <hr> <hr> produzieren zwei Horizontal Rulers.
Achtung mehrere Leerzeichen irritieren

Html genauso wenig wie


mehrere Leerzeilen.
  

 

  
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Sample Output

Hallo, dies ist eine ziemlich lange Zeile, die in Html aber nicht umgebrochen
wird.
Zwei

produzieren zwei Newlines. Es gibt auch noch das tag
--------------------------------------------------------------------------------
was einen Trenner darstellt. Zwei
--------------------------------------------------------------------------------
--------------------------------------------------------------------------------
produzieren zwei Horizontal Rulers. Achtung mehrere Leerzeichen irritieren Html
genauso wenig wie mehrere Leerzeilen.

  

 

  
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注意点：
（1） 每行最多80个字符，如果加上最后一个单词大于80，则最后一个单词移到下一行。
（2） <hr>如果处于当前行字符数等于0的情况，则直接输出，否则先输出回车，在输出<hr>,只含有<br>和<hr>标签
(3) 文章最后要有一个回车
  

 

  
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equals表示的相等，是指向对象的相等；而compareTo的相等，是内容的相等。
不过其中有一个问题，很奇怪~我用equals老是PE，用compareTo就没问题了~~~弄不懂~

代码注释标识了！
有知道原因的大牛，请在评论区指点下，谢啦~
(哈哈~解决啦~其实这2个都可以的~)
之前的PE应该不是这个原因~

import java.util.Scanner;

public class Main{ public static void main(String[] args) { Scanner sc = new Scanner(System.in); String result = new String(""); String str; while (sc.hasNext()) { str = sc.next(); if ("".equals(str)) { continue; } if ("<br>".equals(str)) { System.out.println(result); result = ""; } else if ("<hr>".equals(str)) { if (result.compareTo("")!=0) { //  if (!"".equals(result)) {//这个是一样的！ System.out.println(result); } gong.print(); result = ""; } else { String temp = result; if ((temp + " " + str).length() < 80) { if (!"".equals(result)) { result += " " + str; } else { result = str;// 每一行的第一个输入 } } else { System.out.println(result); result = str; } } } if (!("".equals(result))) { System.out.println(result); } }
}

class gong { static void print() { for (int i = 0; i < 80; i++) System.out.print("-"); System.out.println(); }
}

  

 

  
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文章来源: chenhx.blog.csdn.net，作者：谙忆，版权归原作者所有，如需转载，请联系作者。

原文链接：chenhx.blog.csdn.net/article/details/51512217