How are Java enumeration types defined?

How to define enumeration types in Java: Use the enum keyword to define enumeration types. Enumeration constants are separated by commas. Enumeration constants can be accessed through the dot operator. Use switch statements to perform different operations based on enumeration constants. Enumeration types support the Comparable and Serializable interfaces, providing type safety and flexibility.

How to define an enumeration type in Java

The enumeration type is a data type used to represent a series of fixed , known constants. In Java, you can use the enum keyword to define an enumeration type.

Syntax:

enum EnumName {
  CONSTANT1,
  CONSTANT2,
  // ...
}

Practical case:

We create a coin named Color Enumerated types to represent colors:

enum Color {
  RED,
  GREEN,
  BLUE
}

Use enumerated types:

Constants of enumerated types can be accessed through the dot operator:

Color color = Color.RED;

Also You can use the switch statement to perform different operations based on enumeration constants:

switch (color) {
  case RED:
    System.out.println("颜色是红色");
    break;
  case GREEN:
    System.out.println("颜色是绿色");
    break;
  // ...
}

Characteristics of enumeration types:

• Enumeration Type constants are fixed and cannot be changed.
• Enumeration types provide type safety, ensuring that only defined constants can be used.
• Enumeration constants can have their own methods and fields.
• The enumeration type supports the Comparable and Serializable interfaces.

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