How do I use a variable, which is not yet created as a variable required to create this variable?

[dawn egret]

I'm currently working on GUIScreens in minecraft modding and I am trying to detect when a certain button is pressed. I could do that with the click event and the mouseX and mouseY but there is apparently a onPress event, which is required in order to create a button. For a method to fulfill the requirements for onPress it has to have a button as a parameter, so it seems. However when I do just that, I can't use the button that I'm creating, since it's not a valid variable yet and could be null... How am I supposed to do this?
```java
private void addButtons() {
// Has to be executed when one Entry layout is changes
for(int i = 0; i < entries.size(); i++) {
int y = i * 12 + 20;
int x = 40;
if(i > 5) {
x = 80;
}

        if (entries.get(i).getCurrentLayout().equals("default")) {
            Button button = new Button(x, y, 143, 28, Component.literal("Entry" + i), buttonPressed(button));
            entries.get(i).addButton(button);
            this.addWidget(button);
        }


    }
}


protected void buttonPressed(Button button) {

}

[livid wing]

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[dusk wagon]

you don't

whatever you're doing right now, you're doing it wrong

what's the constructor of Button you want to call

[dawn egret]

I've figured it out. I apparently just misunderstood the concept of lambdas. This whole concept would work but instead of buttonPressed(button) I should use this::buttonPressed