How to check if an item in an ArrayList

I want to use a for loop like this:

`button.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) {
    Object.setList();

for(int i = 0; i < Object.getList.size(); i++)
    if(!Object.getList.get(i).trim().toLowerCase().contains("hello")) {
        Toast.makeText(getContext(), "List does not contain "Hello", Toast.LENGTH_LONG).show;
    }
}`

This is my model:

public class Object {
    private ArrayList<String> mArrayList;

    public void setList() {
        mArrayList = new Arraylist<>();
        mArrayList.add("Hello World!");
        mArrayList.add("Random Message");
        mArrayList.add("ZZZZ")
    }

    public ArrayList<String> getList() {
        return mArrayList;
    }
}

I still keep getting the Toast message, but it works just fine when i use:

if(!Object.getList().toString.trim().toLowerCase().contains("hello"))