I am fairly new to Java and am having some difficulty with implementing an arraylist.

I have some classes that contain variables and i have a new class that contains my arraylist. I would like to know how i would get the variables from the other classes into the arraylist in the new class. I know that you would use the add methods, but am unsure of the code to do it.

Example code would be very useful.

Thanks

Hi,
if i have got your problem write....this can be the solution.

I have 2 classes A and B and I am adding its variable to arraylist in third class. Take care of access modifiers. Also objects can be added to arraylist like wrapper, string or custom objects along with primitive variables.
<----Array List class----->
import java.util.ArrayList;

publicclass arraylisttest {

public static void main(String[] args) {
ArrayList al = new ArrayList();
A a = new A();
B b = new B();
al.add(A.i);
al.add(B.d);
al.add(A.ii);

}

}

<----Class A---->
publicclass A{
public int ii;
public Integer i;
}

<-----Class B----->
publicclass B{

public Double d;
}

I am fairly new to Java and am having some difficulty with implementing an arraylist.

I have some classes that contain variables and i have a new class that contains my arraylist. I would like to know how i would get the variables from the other classes into the arraylist in the new class. I know that you would use the add methods, but am unsure of the code to do it.

Example code would be very useful.

Thanks

Thanks for the Help.

However i forgot to mention that the classes that contain the variables, are in constructors. And now i am getting errors saying 'cannot find symbol - constructor classA'. What can i do to overcome this error.

Thanks

HI, this is the code for my first class, which contains the variables and constructor. Then i have several other classes that contain the same kind of code:

import java.util.Scanner;

public class Details
{
    Scanner console = new Scanner(System.in);

    public String name;
    public int age;

    public Details(String Name, int Age)    
    {
        name = Name;
        age = Age;
    } 

    public String getname()
    {
        return name;
    }

    public int getage()
    {
        return age;
    }

Then i have the class that contains the arraylist:

import java.util.ArrayList;

public class arrayList 
{
    public static void main(String[] args)
    {
        List<Details> list = new ArrayList<Details>();

        Details a = new Details();
        list.add(Details.name);
        list.add(Details.age);

        System.out.println(list);
    }
}

Edited 3 Years Ago by mike_2000_17: Fixed formatting

try this.....actually the problem was....u were instantiating ur Details classes with passing any argument and in your Details clas u didnt had any such constructor defined.....now i hope this will work fine.

import java.util.Scanner;

public class Details {
Details(){

}
Scanner console = new Scanner(System.in);

public String name;

public int age;

public Details(String Name, int Age) {
name = Name;
age = Age;
}

public String getname() {
return name;
}

public int getage() {
return age;
}
}


import java.util.ArrayList;
import java.util.List;

public class arrayList
{
public static void main(String[] args)
{
List list = new ArrayList();

Details a = new Details();
list.add(a.name);
list.add(a.age);

System.out.println(list);
}
}

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