Thread: Problem with the code

Seems your code only adds a single object to the ArrayList, which is placed at index 0. When you try to retrieve index 1, you are trying to access an object at an index in the ArrayList that is not there.

I have recently realised that but i can`t figure out how to fix this issue. Any suggestions?

the task is:

Create a command line application which will store information for servers with the following fields:
Server Name, IP, OS, RAM
The application should be able to add, edit and delete records. Search options should be available as well.
The records are stored in file

So far i have problems with the ADD feature.

The add feature should enter information through command line for the fields of the class(Server Name(String), IP(String), OS9String), RAM(int)). This information then should be written in a text file. I have an idea of what should i do but i don`t know how to write it in Java. The idea is that I shoudl make a method that returns an object from the type of my class (Specification). Then i should use the add() method to write this in my ArrayList object.

I have actually just figured the solution out.

public Specification (String name, String IP, String OS, int RAM){

this.name=name;
this.IP=IP;
this.OS=OS;
this.RAM=RAM;
}

//adding info
public Specification AddInfo(String name, String IP, String OS, int RAM){
return new Specification(name, IP, OS, RAM);
}

...

case 1: {
System.out.println("How many records do you want to make?");
int enterings;
enterings=scan.nextInt();
for(i=0;i<enterings;i++)
{ System.out.println("Enter name");
String entered_name=scan.next();
System.out.println("Enter IP");
String entered_IP=scan.next();
System.out.println("Enter OS");
String entered_OS=scan.next();
System.out.println("Enter RAM");
int entered_RAM=scan.nextInt();
a.add(a.get(i).AddInfo(entered_name, entered_IP, entered_OS, entered_RAM));
}
} break;
...

Thanks for the attention

a.add(a.get(i).AddInfo(entered_name, entered_IP, entered_OS, entered_RAM));

Poor technique.
Create a new object using its constructor and add that new object to a

Originally Posted by Norm

Poor technique.
Create a new object using its constructor and add that new object to a

how exactly to do that? I mean, aren`t constructors used when i create the object within the main method in my code? In my case the information about the objects is entered through the command line (using the Scanner class)

This line uses the class's constructor to create a new object:
new Specification(name, IP, OS, RAM);

put that(with correct variable names) in the call to add()