Java - Autoboxing & Unboxing

• autoboxing is used to convert primitive data types to their wrapper class objects
• unboxing is used to convert wrapper class objects to their primitive data types

When Does Autoboxing and Unboxing Happen

compile time

Example Autoboxing and Unboxing

Integer number = 100;

Integer number = Integer.valueOf(100);

Integer num2 = new Integer(50); 
int inum = num2;

Integer num2 = new Integer(50);
int inum = num2.intValue();

What Data Gets Autoboxed and Unboxed

Things to be Aware Of

Do not mix primitives and objects while doing comparisons

public static void main(String []args){
	System.out.println(
		((Integer) 0) == ((Integer) 0)
	);
	System.out.println(
		((Integer) 100000) == ((Integer) 100000)
	);
}


// would print out
// true
// false