java access enum per index

To access an element of an enum in Java by its index, you can use the values method of the enum type to retrieve an array of the enum elements, and then use the array index to access a specific element.

Here is an example of how you can access an element of an enum by its index in Java:

public enum Color {
    RED,
    GREEN,
    BLUE
}

// Access the second element of the Color enum
Color color = Color.values()[1];

// Print the element
System.out.println(color);  // Output: GREEN

In this example, the Colorenum has three elements: RED, GREEN, and BLUE.

To access the second element of the Colorenum, we use the values method of the Colorenum to retrieve an array of the enum elements, and then use the array index 1 to access the second element.

It is important to note that the values method returns an array of the enum elements in the order they were declared.

Therefore, the first element of the enum has an index of 0, the second element has an index of 1, and so on.

It is also important to note that the values method of an enum type is a static method, and it is called using the enum type name, not an instance of the enum.

Alternatively, you can use the ordinal method of the Enum class to get the index of an enum element. The ordinal method returns the index of the element in the enum type, starting from 0.

Here is an example of how you can use the ordinal method to get the index of an enum element in Java:

// Get the index of the GREEN element of the Color enum
int index = Color.GREEN.ordinal();

// Print the index
System.out.println(index);  // Output: 1

In this example, the ordinal method returns the index of the GREEN element of the Colorenum, which is 1.