Array of Strings in Java
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Array of Strings in Java
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WikiGuru
ADOS (Attention deficit... Oh! Shiny!)


Elite


Joined: 15 Sep 2005
Posts: 923
Posted: 22 Jan 2007 05:32:32 pm    Post subject:
I've been trying to create an array of strings in Java. Here's my code (only the parts giving me problems):

In Class A:

Code:
public class A{
 private String a[10];

 public void changeElement(String e, int num){
  a[num]=e;
 }

}


Here's my application code:

Code:
import Java.util.Scanner;
public class App{
 Scanner reader=new Scanner(System.in);
 System.out.print("Elements(less than 10):");
 int j=reader.nextInt();
 A test=new A();
 for(int i=0; i<j; i++){
  While(reader.nextLine()=="\n");
  System.out.print("\nInput element "+i+":");
  A.changeElement(reader.nextLine(),i);
 }
}


What's wrong with this? It compiles fine, but throws a runtime error pointing to changeElement when I when I try to run this code and it reaches that point.
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JoeImp
Enlightened


Active Member


Joined: 24 May 2003
Posts: 747
Posted: 22 Jan 2007 07:09:00 pm    Post subject:
Why would you want to create a class to do that? Just access the array directly.

Last edited by Guest on 22 Jan 2007 07:09:21 pm; edited 1 time in total
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WikiGuru
ADOS (Attention deficit... Oh! Shiny!)


Elite


Joined: 15 Sep 2005
Posts: 923
Posted: 22 Jan 2007 07:20:06 pm    Post subject:
I'm creating a phone book class for my programming class.
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JoeImp
Enlightened


Active Member


Joined: 24 May 2003
Posts: 747
Posted: 22 Jan 2007 07:30:27 pm    Post subject:

Code:
public class String_Class
{
   private String array[];
   
   public String_Class()
   {
  array = new String[10];
   }
   
   public void set(String value, int index)
   {
  array[index] = value;
   }
   
   public void output()
   {
  for (int x = 0; x < 10; x++)
  {
     System.out.println(array[x]);
  }
   }
   
   public static void main(String [] args)
   {
  String_Class tester = new String_Class();
  
  for (int x = 0; x < 10; x++)
  {
     tester.set(new String(Integer.toString(x)), x);
  }
  
  tester.output();
   }
}



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Arcane Wizard
`semi-hippie`


Super Elite (Last Title)


Joined: 02 Jun 2003
Posts: 8993
Posted: 23 Jan 2007 02:59:36 am    Post subject:
For testing classes I suggest JUnit.

Quote:
I'm creating a phone book class for my programming class.
I'm betting the phone book won't always hold exactly 10 or less entries.

Try Java.util.HashMap or Java.util.ArrayList. They're like arrays but actually usefull and come with all the functions for element manipulation you'd need.
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