hw1打卡

 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。。

import java.net.*;
import java.io.*;

/**  A class that provides a main function to read five lines of a commercial
 *   Web page and print them in reverse order, given the name of a company.
 */

class OpenCommercial {

  /** Prompts the user for the name X of a company (a single string), opens
   *  the Web site corresponding to www.X.com, and prints the first five lines
   *  of the Web page in reverse order.
   *  @param arg is not used.
   *  @exception Exception thrown if there are any problems parsing the 
   *             user's input or opening the connection.
   */
  public static void main(String[] arg) throws Exception {

    BufferedReader keyboard;
    String inputLine;

    keyboard = new BufferedReader(new InputStreamReader(System.in));

    System.out.print("Please enter the name of a company (without spaces): ");
    System.out.flush();        /* Make sure the line is printed immediately. */
    inputLine = keyboard.readLine();
    /* Replace this comment with your solution.  */
    URL url=new URL("http://www."+inputLine+".com"); 
    InputStream in=url.openStream();
    InputStreamReader ina=new InputStreamReader(in);
    BufferedReader inb=new BufferedReader(ina);
    String[] out=new String[5];
    for(int i=0;i<5;i++){
    out[i]=inb.readLine();//read strings in right way.
    }
    for(int j=4;j>=0;j--){
    System.out.println(out[j]);//output strings in reverse way.
    }
  }
}

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：http://soft.chinabyte.com/database/191/12466191.shtml 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：