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Java程序练习-Web浏览

Web浏览
时间限制: 10000ms内存限制: 1024kB
描述
实现浏览器的页面前后访问机制。有四种命令:
1、BACK;
2、FORWARD;
3、VISIT:访问新的页面;
4、QUIT:退出浏览器。
请参考实际的浏览器按钮的功能。
假设浏览器打开时,显示的页面是:http://www.acm.org/
输入
一系列命令:以BACK、FORWARD、VISIT或QUIT开头。如果是VISIT,后面要跟URL,长度不超过70,且不含空格。最后总是以QUIT结尾。(最多5000个命令)
输出
对于每一个命令(除了QUIT),输出浏览页面的URL,如果命令被忽略,输出:Ignored。
样例输入
VISIT http://acm.ashland.edu/
VISIT http://asm.baylor.edu/acmipc/
BACK
BACK
BACK
FORWARD
VISIT http://www.ibm.com/
BACK
BACK
FORWARD
FORWARD
FORWARD
QUIT
样例输出
http://acm.ashland.edu/
http://asm.baylor.edu/acmipc/
http://acm.ashland.edu/
http://www.acm.org/
Ignored
http://acm.ashland.edu/
http://www.ibm.com/
http://acm.ashland.edu/
http://www.acm.org/
http://acm.ashland.edu/
http://www.ibm.com/
Ignored
参考代码
 
/*
 * Web Browser 2011-10-3 11:10AM Eric Zhou
 */ 
import java.io.BufferedReader; 
import java.io.IOException; 
import java.io.InputStreamReader; 
import java.util.ArrayList; 
import java.util.List; 
public class Main { 
    public static void main(String[] args) throws IOException { 
        BufferedReader cin = new BufferedReader(new InputStreamReader(System.in)); 
        List<String>list = new ArrayList<String>(); 
        list.add("http://www.acm.org/"); 
        int cur = 0; 
        while(true){ 
            String s[] = cin.readLine().split(" "); 
            if(s[0].compareTo("QUIT") == 0) 
                break; 
            if(s[0].compareTo("BACK") == 0){ 
                if(cur > 0){ 
                    -- cur; 
                    System.out.println(list.get(cur)); 
                }else{ 
                    System.out.println("Ignored"); 
                } 
                continue; 
            } 
            if(s[0].compareTo("FORWARD") == 0){ 
                if(cur != list.size() - 1){ 
                    ++ cur; 
                    System.out.println(list.get(cur)); 
                }else{ 
                    System.out.println("Ignored"); 
                } 
                continue; 
            } 
            if(s[0].compareTo("VISIT") == 0){ 
                while(cur < list.size() - 1) 
                    list.remove(cur + 1); 
                list.add(++ cur,s[1]); 
                System.out.println(list.get(cur)); 
                continue; 
            } 
        } 
    } 

摘自:冰非寒 blog

补充:软件开发 , Java ,
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