Question

I am studying the Java and
I am studying about concept of class type of class

For example,
in the Print.java

public class Print{
    public ArrayList<data> list;
    public Print(){
        list = new ArrayList<data>();
    } 


    public void printIndexList() {
        for (data index : list) {
            System.out.format("\", index.name)
        }

        for (String definition : b.def) {
            System.out.format("%-6s", definition);
        }
    }

and In the data.java

public class  data{
     public String name
     public ArrayList<String> def;

     public data(){
         def = new ArrayList<String>();
     }
}

And, in the main.java,
I have String type ArrayList “defmain” and String type “mainname”

I would like to add the defmain and mainname in the list because I need to use printing function in the b.java

What I tried to do way

in the main.java, I have created: –

Print ia = new ptiny();

Array<Print> mainlist = new Array<Print>();

and.. tried to assign value in the list in the a.java

ia.list = mainlist;

however, it didn’t really work.
does anybody know a way to add a string value and an arraylist in the Arraylist which has type “a”?

thanks

Answer 1

Note that class names should start with uppercase letters. The following should work:

A ia = new A();
B ib = new B();
ib.def.add("Test");
ia.list.add(ib);
ia.printIndexList();

Note that I’m not assigning any list. I’m adding elements to lists.