java int vs Integer

YOU.com answered on June 28, 2021 Popularity 9/10 Helpfulness 1/10

answer java int vs Integer

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java int vs Integer

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int a = 5; // declaring and initializing an int variable
System.out.println("Value of a: " + a);

Integer b = 10; // declaring and initializing an Integer object
System.out.println("Value of b: " + b);

// Converting int to Integer and vice versa
int c = b.intValue(); // converting Integer to int
Integer d = Integer.valueOf(a); // converting int to Integer

// Using Integer in a list
List<Integer> numbers = new ArrayList<>();
numbers.add(a); // autoboxing: int a automatically converted to Integer
numbers.add(b);
System.out.println("Numbers list: " + numbers);

// Performing operations with int and Integer
int sum = a + b; // int + Integer: unboxing, Integer automatically converted to int
System.out.println("Sum of a and b: " + sum);

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Contributed on Sep 12 2023

YOU.com

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int is a primitive type. Variables of type int store the actual binary value for the integer you want to represent. int.parseInt("1") doesn't make sense because int is not a class and therefore doesn't have any methods.

Integer is a class, no different from any other in the Java language. Variables of type Integer store references to Integer objects, just as with any other reference (object) type. Integer.parseInt("1") is a call to the static method parseInt from class Integer (note that this method actually returns an int and not an Integer).

To be more specific, Integer is a class with a single field of type int. This class is used where you need an int to be treated like any other object, such as in generic types or situations where you need nullability.

Note that every primitive type in Java has an equivalent wrapper class:

    byte has Byte
    short has Short
    int has Integer
    long has Long
    boolean has Boolean
    char has Character
    float has Float
    double has Double

Wrapper classes inherit from Object class, and primitive don't. So it can be used in collections with Object reference or with Generics.

Since java 5 we have autoboxing, and the conversion between primitive and wrapper class is done automatically. Beware, however, as this can introduce subtle bugs and performance problems; being explicit about conversions never hurts.

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Contributed on Jun 28 2021

Sore Starling

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integer vs int java

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public class IntegerVsIntDemo {
    public static void main(String[] args) {
        Integer objInteger = new Integer(10); // Creating an instance of "integer" class
        int primInt = 20; // Declaring a primitive int variable
        
        // Performing various operations using the "integer" class methods
        System.out.println("Value of objInteger: " + objInteger.toString());
        System.out.println("Value of objInteger + primInt: " + (objInteger + primInt));
        System.out.println("Value of primInt: " + primInt);
        
        // Performing various operations using primitive int operations
        System.out.println("Value of primInt * 2: " + (primInt * 2));
        System.out.println("Value of primInt / 3: " + (primInt / 3));
    }
}

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Contributed on Sep 11 2023

YOU.com

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java int vs Integer

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