What is the size of enum in Java?

What is the size of enum in Java?

On an 8-bit processor, enums can be 16-bits wide. On a 32-bit processor they can be 32-bits wide or more or less. The GCC C compiler will allocate enough memory for an enum to hold any of the values that you have declared. So, if your code only uses values below 256, your enum should be 8 bits wide.

How do you find the enum size?

In both C and C++, the size of an enumerator sizeof(enumStruc_2) is the size of any individual element in that enumeration. In C, the answer is sizeof(int) . So that’s at least 2. In C++, the answer is sizeof(std::underlying_type::type) .

What is the size of enum?

enum syntax

Range of Element Values Enum Options
small (default) int
0 .. 65535 2 bytes unsigned 4 bytes signed
-32768 .. 32767 2 bytes signed 4 bytes signed
0 .. 2147483647 4 bytes unsigned 4 bytes signed

How many bytes is an enum Java?

four bytes
This means that an enum reference costs as much as any other object reference, usually four bytes.

Why is enum size 4?

The size is four bytes because the enum is stored as an int . With only 12 values, you really only need 4 bits, but 32 bit machines process 32 bit quantities more efficiently than smaller quantities.

What is the size of INT?

4 bytes
Data Types and Sizes

Type Name 32–bit Size 64–bit Size
short 2 bytes 2 bytes
int 4 bytes 4 bytes
long 4 bytes 8 bytes
long long 8 bytes 8 bytes

Is an enum an int?

The enum can be of any numeric data type such as byte, sbyte, short, ushort, int, uint, long, or ulong. However, an enum cannot be a string type.

Why do we use enums?

Enums are used when we know all possible values at compile-time, such as choices on a menu, rounding modes, command-line flags, etc. It is not necessary that the set of constants in an enum type stay fixed for all time. In Java (from 1.5), enums are represented using enum data type.

Why sizeof int is 4?

So the reason why you are seeing an int as 4 bytes (32 bits), is because the code is compiled to be executed efficiently by a 32-bit CPU. If the same code were compiled for a 16-bit CPU the int may be 16 bits, and on a 64-bit CPU it may be 64 bits.

How to create an enum type in Java?

Java requires that the constants be defined first,prior to any fields or methods.

  • Each enumeration constant is an object of its enumeration type.
  • Same like any other object each enumeration constant has its own copy of instance variables defined by the enumeration.
  • The constructor for an enum type must be package-private or private access.

    • What is the difference between array and enum in Java?

    enum is defined constant name for integer value for easy remembrance for the programmer array is a collection of data or value address in a real word we know that we have 12 month in a year and enum of months can go like this enum month {jan,Feb,…} and an array may contain how many days are in each month ex. days [12]= {30,31,34,….}

    Is Java enum the same as integers?

    The Java type system, however, treats enumerations as a type separate from integers, and intermixing of enum and integer values is not allowed. In fact, an enum type in Java is actually a special compiler-generated class rather than an arithmetic type, and enum values behave as global pre-generated instances of that class.

    What’s the use of “enum” in Java?

    Enum in java is a data type that contains fixed set of constants. It can be used for days of the week (SUNDAY, MONDAY, TUESDAY, WEDNESDAY, THURSDAY, FRIDAY and SATURDAY) , directions (NORTH, SOUTH, EAST and WEST) etc. The java enum constants are static and final implicitly.