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

Collections.shuffle shuffles the array in-place. This will be sufficient:

private ArrayList tips;

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

Or if you don't want the original list to change:

private ArrayList tips;

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