Homework1

 Program1

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 u = new URL("http://www."+inputLine+".com");
    InputStream ins=u.openStream();
    InputStreamReader isr= new InputStreamReader(ins);
    BufferedReader bd = new BufferedReader(isr);
    
    String[] outprint=new String[5];
    for (int j=4;j>=0;j--) {
    	outprint[j]=bd.readLine()+"
";//have nothing to do
    }

    for(int i=0;i<5;i++) {
    	System.out.print(outprint[i]);//have no idea why I cannot use printIn
    }
  } 
}   

println...小写L，不是大写i....

Program2 Nuke

import java.io.*;

class OpenCommercial {
  public static void main(String[] arg) throws Exception {

    BufferedReader keyboard;
    String inputString;
    keyboard = new BufferedReader(new InputStreamReader(System.in));
    System.out.print("Input A String: ");
    System.out.flush();     
    inputString = keyboard.readLine();

    String former=new String(inputString.substring(0,1));
    String latter=new String(inputString.substring(2,inputString.length()));
    
    System.out.print(former+latter);
  }
}