Thread: 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];

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

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...

Originally Posted by chronoz13

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.

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