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Thread: int and Integer

  1. #1
    Java kindergarten chronoz13's Avatar
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    Default int and Integer

    whats the difference with and reserved word int and Integer class?

    Integer[] number = new Integer[12];

    and

    int[] numbers = new int[12];


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    Administrator copeg's Avatar
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    Default Re: int and Integer

    int is a primitive, Integer is an immutable class. In most cases you want to stick with using primitives. In certain cases, say cases in which Objects are needed to do something, you need to use the object form (an example would be using it in Collections - although as of 1.5 the compiler does the conversions for you).
    see int vs Integer : Java Glossary

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    chronoz13 (December 29th, 2009)

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    Java kindergarten chronoz13's Avatar
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    Default Re: int and Integer

    that helped me bit sir! thats why im having problems with int[] arrays,,

    Integers allows null values, while int doesnt, the offset or default value of int is '0' , which has no countable value but nut null...

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    Default Re: int and Integer

    0 is definitely a value

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    Administrator copeg's Avatar
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    Default Re: int and Integer

    Quote Originally Posted by chronoz13 View Post
    Integers allows null values, while int doesnt, the offset or default value of int is '0' , which has no countable value but nut null...
    If you wish to 'nulify' an int, you can initialize the value to something you know it will never be (in many cases this can be Integer.MAX_VALUE or Integer.MIN_VALUE) - which is sort of a pseudo-null in the sense that if it is equal to this default value, its value was never set.

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    chronoz13 (December 31st, 2009), DanielJamesCollier (July 3rd, 2012)

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    Java kindergarten chronoz13's Avatar
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    Default Re: int and Integer

    yah exactly world! thats why im having problems with int arrays!! because of 0, and 0 != null

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