CODEWITHSUNDEEP
javadebuggingoperatorsinvalid-argument
Dan
Dan

Reputation: 1

How can I fix an invalid arugement operator in Java?

I'm struggling to debug my code. There is this one error after getting my instance and trying to substract 1 from my instance variable the code give me an error. I tried to debug many times but I couldn't figure it out. The error is invalid arguement to operation ++/--

   game.setNumHealthPotions(game.getNumHealthPotions()--); // The Second game.getNumHealhPotions has the error.

2nd error

game.setNumHealthPotions(game.getNumHealthPotions++);

My setters and getters both lines

public void setNumHealthPotions(int numHealthPotions){
    this.numHealthPotions = 1;
}

  public int getNumHealthPotions(){
    return numHealthPotions;
}

Upvotes: 0

Views: 102

Answers (1)

shmosel
shmosel

Reputation: 50726

++ and -- are assignment operators. You can't assign a value to a method. You'll have to call both get and set to read and assign:

game.setNumHealthPotions(game.getNumHealthPotions() + 1);

Or you can add an increment method if it's a common use case:

public int incrementNumHealthPotions(int increment) {
    return this.numHealthPotions += increment;
}

Called like this:

game.incrementNumHealthPotions(-1);

Upvotes: 2

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