如何或可以概括多个JButton的If语句（颜色变化）？

Question

So I'm trying to make multiple buttons do the same change in color when they are pressed. Each individual press should cycle through a predetermined cycle of colors (White, Red, Green, Yellow, Blue, Black). I could just make a long if-else-statement but for I'm pretty sure there's a better way, I just can't come up with one.

I have already tried "getSource().getBackground()" in the second if-statement but it's not able to get the same variable as the first if-statement does.

 public void actionPerformed(ActionEvent e){   
    if(e.getSource() == btn1){  
      if(getSource().getBackground() == Color.white)  
        setBackground(Color.red);  
        else  
        setBackground(Color.white);  
    }  

As previously stated I'm trying to minimize the effort here and make it also a bit more organized.

Answer 1

A possible solution would be something like:

1. Initialize a "button-pressed" counter. So have a variable outside your actionPerformed method and increment it everytime the button is pressed. Add some logic to reset the counter value once it exceeds a certain threshold, ie after you cycled through your "last" colour, return to the first color.
2. Have a switch statement, which would set the background according to the value of the counter (essentially, how many times the button was pressed).

Answer 2

What I would do is make a function that checks and changes background and then pass all my buttons to it.

public void checkAndChangeColor(Object source, Object btn, int bgToCheck, int bgToChange1, int bgToChange2){
    if (source == btn) {
        if (source.getBackground() == bgToCheck)
            setBackground(bgToChange1);
        else
            setBackground(bgToChange2);
    }
}

and then I would call that method on every button.

checkAndChangeColor(e.getSource(), btn, Color.white, Color.red, Color.white);

Answer 3

Make a private inner class that implements ActionListener and have a collection of colors inside it. Override actionPerformed and have an internal count so e.setBackground(colorList.get(count % colorList.size())