Null Pointer Error in trying to save the date as string.

Programming Questions

jackonhs

Null Pointer Error in trying to save the date as string.

in Programming Questions • 2 years ago

Alright so I'm working on a project in my free time and right now I'm trying to get it to save the date the program is first run as a .txt file. During this I get a NullPointException in trying to save the date as the string

Any clues?

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String[] SaveData;

void newGame(){ //Makes new save data.

println(year()+ ":" + day() + ":" + hour() + ":" + minute()); //prints the date for help debugging incase something like this happens.

SaveData[0] = year()+ ":" + day() + ":" + hour() + ":" + minute(); //Should save date into [0] of SaveData this is were error is.

println(SaveData[0]); //Never makes it to here.

saveStrings("Save.txt", SaveData);

}

Replies(4)

quarks

Re: Null Pointer Error in trying to save the date as string.

2 years ago

You need to create the array before using it.

String[] SaveData = new String[size_of_array_wanted];

where size_of_array_wanted >= 0

mcryach

Re: Null Pointer Error in trying to save the date as string.

3 months ago

Thanks quarks. It resolved my issue with NPE too. But what if the size of the array is unknown at the point of initializing the string array? Is there way around [wanted_array_size]. Or can I declare the largest possible number and later delete the elements of the array with the null value?