java how to pass a function as a parameter code example

Example 1: java pass method as parameter

public void setAllComponents(Component[] myComponentArray, Consumer<Component> myMethod) {
    for (Component leaf : myComponentArray) {
        if (leaf instanceof Container) { 
            Container node = (Container) leaf;
            setAllComponents(node.getComponents(), myMethod);
        } 
        myMethod.accept(leaf);
    } 
}

Example 2: java pass method as parameter

setAllComponents(this.getComponents(), this::changeColor);
setAllComponents(this.getComponents(), this::changeSize);