David Maddox

I am trying to write a program that demonstrates a linked list (yes it is homework). In the specs, the requirement is that the user is supposed to type the end of file character to signify when they are done entering names. I can get it to run perfectly if I have the user type in a signifying phrase ("DONE"), but I cant figure out the end of file part.


Here is the whole program:

import java.util.*; import java.io.*; import java.util.logging.Level; import java.util.logging.Logger; public class Names { private static String name, lastName; private String search; private int selection; public Names(){ // Names Constructor List < String > list = new LinkedList < String >(); Scanner input = new Scanner(System.in); System.out.println("Please enter some first names. When done type DONE "); lastName = " "; // add the items to the list while(!input.hasNext("DONE")){ name = input.next(); if(lastName != name){ list.add(name); } lastName = name; } name = input.next(); // Advance the scanner System.out.println("1. Print in Reverse Order"); System.out.println("2. Find a name"); System.out.println("3. Shuffle the list"); System.out.println("4. Sort the list"); System.out.println("5. Find the Min"); System.out.println("6. Find the Max"); System.out.println("What would you like to do with the list?: "); selection = input.nextInt(); // Do the appropriate search switch (selection){ case 1: Collections.reverse(list); printList(list); break; case 2: System.out.println("What name would you like to search for?"); search = input.next(); printSearchResults(search, list); break; case 3: Collections.shuffle(list); printList(list); break; case 4: Collections.sort(list); printList(list); break; case 5: System.out.println(Collections.min(list)); break; case 6: System.out.println(Collections.max(list)); break; } } public void printList( List< String > list ) { // From Deitel System.out.println( "\nlist: " ); for ( String name : list ) System.out.printf( "%s ", name ); System.out.println(); } // end method printList private void printSearchResults( String key, List <String> list ) { // Modified Deitel search function int result = 0; System.out.printf( "\nSearching for: %s\n", key ); result = Collections.binarySearch( list, key ); if ( result >= 0 ) System.out.printf( "Found at index %d\n", result ); else System.out.printf( key + " Not Found (%d)\n",result ); } // end method printSearchResults public static void main(String[] args) { new Names(); } }


Specifically, here is the part where I am reading in their input:

public Names(){ // Names Constructor List < String > list = new LinkedList < String >(); Scanner input = new Scanner(System.in); System.out.println("Please enter some first names. When done type DONE "); lastName = " "; // add the items to the list while(!input.hasNext("DONE")){ name = input.next(); if(lastName != name){ list.add(name); } lastName = name; }


Any suggestions to point me in the right direction would be massively helpful.

I have never used command line arguments before, so I am having a little difficulty.

Essentially what I am trying to do is have this program when there are no arguments, the program runs in a certain mode, and when it has certain arguments to run in different modes:

No arguments: Human v Human
-c: Computer v Computer
-c 1 Computer is player 1
-c 2 Computer is player 2


When I try and run the program in its current state, I am getting an array index out of bounds exception. Here is the main function:

public static void main(String[] args) { TicTacToe board = new TicTacToe(); if(args[0].equals("-c")){ if (args[1].equals(null)){ System.out.println("This is TWO COMPUTERS PLAYING"); board.CompvComp(); } else if (args[1].equals("1")) { System.out.println("Computer is player 1"); board.CompvHuman(1); } else if(args[1].equals("2")){ System.out.println("Computer is player 2"); board.CompvHuman(2); } else { System.out.println("Usage: java TicTacToe [-c [1|2]]"); } } else if(args[0].equals(null)){ board.HumanvHuman(); } else{ System.out.println("Usage: java TicTacToe [-c [1|2]]"); } } }

Thank you for your help!

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yeah i hit the wrong button

ok here is an example
public class Dog{
public void bark(){
}
}

public class dogTest{
Dog dog= new Dog(); /*you create a dog object and it has all of its methods/*
dog.bark();
}
[ February 26, 2004: Message edited by: David Maddox ]
[ February 26, 2004: Message edited by: David Maddox ]

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[ February 26, 2004: Message edited by: David Maddox ]