Java Pass Method as Parameter

Question

I am looking for a way to pass a method by reference. I understand that Java does not pass methods as parameters, however, I would like to get an alternative.

I\'ve

Answer 1

Use the Observer pattern (sometimes also called Listener pattern):

interface ComponentDelegate {
    void doSomething(Component component);
}

public void setAllComponents(Component[] myComponentArray, ComponentDelegate delegate) {
    // ...
    delegate.doSomething(leaf);
}

setAllComponents(this.getComponents(), new ComponentDelegate() {
                                            void doSomething(Component component) {
                                                changeColor(component); // or do directly what you want
                                            }
                                       });

new ComponentDelegate()... declares an anonymous type implementing the interface.