修仙修仙！

PART1：给你了一部分源代码，让你根据输入建立URL，读取网站HTML的前五行内容，逆序输出。。

1 import java.net.*; 2 import java.io.*; 3  4 /**  A class that provides a main function to read five lines of a commercial 5  *   Web page and print them in reverse order, given the name of a company. 6  */ 7  8 class OpenCommercial { 9 10   /** Prompts the user for the name X of a company (a single string), opens11    *  the Web site corresponding to www.X.com, and prints the first five lines12    *  of the Web page in reverse order.13    *  @param arg is not used.14    *  @exception Exception thrown if there are any problems parsing the 15    *             user's input or opening the connection.16    */17   public static void main(String[] arg) throws Exception {18 19     BufferedReader keyboard;20     String inputLine;21 22     keyboard = new BufferedReader(new InputStreamReader(System.in));23 24     System.out.print("Please enter the name of a company (without spaces): ");25     System.out.flush();        /* Make sure the line is printed immediately. */26     inputLine = keyboard.readLine();27     /* Replace this comment with your solution.  */28     URL url=new URL("http://www."+inputLine+".com"); 29     InputStream in=url.openStream();30     InputStreamReader ina=new InputStreamReader(in);31     BufferedReader inb=new BufferedReader(ina);32     String[] out=new String[5];33     for(int i=0;i<5;i++){34     out[i]=inb.readLine();//read strings in right way.35     }36     for(int j=4;j>=0;j--){37     System.out.println(out[j]);//output strings in reverse way.38     }39   }40 }

逆序输出倒不难。。就是这个网站的部分研究了半天，还有感觉这个BufferedReader甚是麻烦。。

运行结果：

PART2：输入一串字符，去掉第二个字符并输出：

找了几种不同的键盘输入的方法： 我这里打算试试用Scanner

 

import java.util.*;public class Nuke2 { public static String process(String s,int b){ return s.substring(0, b)+s.substring(b + 1); }  public static void main(String[] arg) {           System.out.println("Please input a string:");      System.out.flush();      Scanner sc=new Scanner(System.in);      String line=sc.nextLine();      String output=process(line);      System.out.print(output); }}

运行结果：