Weird Integer boxing in Java

Question

I just saw code similar to this:

public class Scratch
{
    public static void main(String[] args)
    {
        Integer a = 1000, b = 1000;
        System.o         


        

Answer 1

In Java 5, a new feature was introduced to save the memory and improve performance for Integer type objects handlings. Integer objects are cached internally and reused via the same referenced objects.

1. This is applicable for Integer values in range between –127 to +127 (Max Integer value).

2. This Integer caching works only on autoboxing. Integer objects will not be cached when they are built using the constructor.

For more detail pls go through below Link:

Integer Cache in Detail