Understand Method reference

MethodReference.java

import java.awt.Color;
import java.util.function.Function;

public class Main {
  
  public static void execute(Function<NewBrightColor, Color> func) {
    func.apply(new NewBrightColor());
  }
  
  public static void main(String[] args) {
   
    // Reference to an instance method of an arbitrary object of a particular type
    NewBrightColor brightColor = new NewBrightColor();
    Function <Color, Color> fun2 = brightColor::getBrightColor1;
    
    // Reference to an instance method of a particular object
    Function <NewBrightColor, Color> func1 = NewBrightColor::getBrightColor;
    //So when we call func1.apply(color) we call color.getBrightColor and return the result.
  }
}

class NewBrightColor {
  public  Color getBrightColor() {
    return null;
  }
  
  public Color getBrightColor1(Color Color) {
    return null;
  }
}