如何将对象列表添加到另一个具有对象列表成员的 class？

Question

I've got a class, Omega , that has as a member a List<Alpha> . If I then had a list of Omega s, how would I add a list of Alpha s to get Omega ?

public class testClass{
    public static void main(String[] args) {
        List <Omega> omegaA = new LinkedList<Omega>();
        List <Alpha> alphaA = new LinkedList<Alpha>();
        testMethod(alphaA);
    }
    
    public void testMethod(List<Omega> blue){
    
        for (int i = 0; i < blue.size(); i++){
            Alpha x = new Alpha();
            Alpha z = new Alpha();
            x.setBob(i);
            z.setBob(i);
        }
        
        //How to add x and z as a list to the first blue in the list?
        //If blue had 2 entries in the list, how to add them to the second item in list?
    }
    
    public class Omega{
        public int number;
        public List<Alpha> beta;
    }
    
    public class Alpha{
    
        public int bob;
    
        public int getBob() {
            return bob;
        }
        public void setBob(int x) {
            this.bob = bob;
        }
    }
}

Answer 1

First, initialize the list in Omega:

public class Omega {
    public int number;
    public List<Alpha> beta = new ArrayList<>();
}

then to add x and z to each Omega :

for (int i = 0; i < blue.size(); i++){
    Alpha x = new Alpha();
    Alpha z = new Alpha();
    x.setBob(i);
    z.setBob(i);
    blue.get(i).add(x);
    blue.get(i).add(z);
}