debounce on interrupt button

hi, sorry for my bad english,

i trying to test interrupt button,
this is the code :

const byte interruptPin = 19;
volatile byte state = LOW;
byte H = 0, L = 0;

void setup() {
  Serial.begin (9600);
  pinMode(LED_BUILTIN, OUTPUT);
  pinMode(interruptPin, INPUT_PULLUP);
  attachInterrupt(digitalPinToInterrupt(interruptPin), blink, CHANGE);
}

void loop() {
  digitalWrite(LED_BUILTIN, state);
}

void blink() {
  if (digitalRead(interruptPin) == HIGH)
  {
    //turn off
    state = HIGH;
    H++;
    Serial.print("H :");
    Serial.println(H);
  }
  else
  {
    state = LOW;
    L++;
    Serial.print("L :");
    Serial.println(L);
  }

}

and the result is

H :1
L :1
L :2
L :3
H :2
L :4
L :5
L :6
H :3
H :4
L :7
H :5
L :8
L :9
L :10
H :6
H :7
L :11
H :8
L :12
H :9

as you can see, the LOW detected 3 times, and HIGH detected 1 time in the first 4 output,
my question is: can the interrupt button combine with debounce?
and thanks for reading,

The difference between L and H could not exceed 1 if the code would work correctly.

Don't Serial.print from an ISR.

Declare all variables shared between ISR and main code volatile.

Don't use interrupts for buttons.

I use Bounce2 to handle debouncing of buttons.

Whandall:
The difference between L and H could not exceed 1 if the code would work correctly.

Don't Serial.print from an ISR.

Declare all variables shared between ISR and main code volatile.

Don't use interrupts for buttons.

I use Bounce2 to handle debouncing of buttons.

seems my code wrong in many ways,
i just want to test "interrupts for button", but it seems bad idea,
thanks for the reply,

Using an interrupt to monitor a switch as an experiment is OK, but is not really good practice in a "real" program. Interrupts are to detect events that happen quickly, a button pushed by a human is very slow in microcontroller terms. You can use software debounce as suggested by Whandall or hardware debounce. Hardware debounce is simply a 0.1uf (or so) capacitor across the switch (1 leg to ground and the other to the switch pin).