Type mismatch: cannot convert from void to ArrayList

Question

Why am I getting this error for this code? I have the correct imports for ArrayList an Collections

private ArrayList tips;

public TipsTask(ArrayLi         


        

Answer 1

You should call it like this:

private ArrayList tips;

public TipsTask(ArrayList tips){
    this.tips = tips;
    Collections.shuffle(tips);
}

Collections.shuffle(tips) modifies the ArrayList directly. It does not need to create a copy.