How to find if Jvm is 32 bit or 64 bit

You can find JVM bit size e.g. 32 bit or 64 bit by using either running java command from the command prompt or by using System.getProperty()from Java program. The question is why do you want to know hardware or platform configuration while writing Java code which is supposed to write once and read anywhere(32 bit, 64 bit etc)? Yes we don't really need to know whether JVM is 32 bit or 64 bit more often but there are many situations when this matters

Check if JVM is 32 or 64 bit from Java program:

1)Since in 32 bit JVM maximum heap size in Java can not be more than 4GB (theoretically) , if you can get JVM version from a script like running java command you can have different memory configuration for your application. Also, if there is any specific JVM options which only applicable to 64 bit JVM than you can set those.

2)If your Java application is using native libraries then you certainly want to know whether Java running on the host is 32 bit or 64 bit because native library may have different versions loaded for 32 bit or 64-bit architectures.

Create object of interface and Abstract class

YES....

we can create the object of an interface / Abstract class.

As per the java specification we are not allowed to create object of interface and abstract class 

directly.but we can do that indirectly with the help of anonymous inner type.

Interface:

An interface in java is a blueprint of a class. It has static constants and abstract methods only.

The interface in java is a mechanism to achieve fully abstraction. There can be only abstract methods in the java interface not method body. It is used to achieve fully abstraction and multiple inheritance in Java.