Java enum Strings
What is Java enums?
Java enums, short for enumerations, are a special type of class that defines a fixed set of constants. These constants are fixed values that are known at compile-time, and are typically used to represent a fixed set of options, such as a set of predefined values for a variable.
Enums have some utility methods such as values(), valueOf() and name().
To know more about Java enum in java read the complete article.
Java enum strings:
Java enums are a special type of class that defines a fixed number of constants. One of the ways to use enums is to associate a string value with each enum constant.
- In the example I provided earlier, the Color enum is defined with three constants: RED, GREEN, and BLUE. Each constant has an associated string value that represents the hex code for that color.
- The enum also has a constructor that takes a string and assigns it to the hexCode field, and a getter method getHexCode() that returns the hex code of the color.
Note:
Enums are defined using the enum keyword.
Note:
Enums can be used in switch statements and in type-safe enumerations.
Let’s look at a Java enum where the Java enum strings is used to perform an operation on the given code.
Example 1 : Java enum string
public enum Color {
RED("#ff0000"),
GREEN("#00ff00"),
BLUE("#0000ff");
private String hexCode;
Color(String hexCode) {
this.hexCode = hexCode;
}
public String getHexCode() {
return hexCode;
}
}
public class Main {
public static void main(String[] args) {
Color color = Color.RED;
System.out.println("Hex code of color: " + color.getHexCode());
//compare color with string
if(color == Color.RED) {
System.out.println("Color is Red");
}
}
}
Output
Hex code of color: #ff0000 Color is Red
Explanation:
In this example, I've defined an enum called Color that contains three constants: RED, GREEN, and BLUE. Each constant has an associated string value that represents the hex code for that color. The enum also has a constructor that takes a string and assigns it to the hexCode field, and a getter method getHexCode() that returns the hex code of the color.
In the main method, I've created a variable of the Color enum type and assigned an instance of the Color.RED enum to it. Then I've used the getHexCode() method to get the hex code of the color and I've compared the color with the string constant.
Example 2 : Java enum strings
public enum Fruit {
APPLE("red"),
BANANA("yellow"),
ORANGE("orange");
private String color;
Fruit(String color) {
this.color = color;
}
public String getColor() {
return color;
}
}
public class Main {
public static void main(String[] args) {
Fruit fruit = Fruit.APPLE;
System.out.println("Color of fruit: " + fruit.getColor());
//compare fruit with string
if(fruit.toString().equals("APPLE")) {
System.out.println("Fruit is Apple");
}
}
}
Output
Color of fruit: red Fruit is Apple
Explanation:
In this example, I've defined an enum called Fruit that contains three constants: APPLE, BANANA, and ORANGE. Each constant has an associated string value that represents the color of the fruit. The enum also has a constructor that takes a string and assigns it to the color field, and a getter method getColor() that returns the color of the fruit.
In the main method, I've created a variable of the Fruit enum type and assigned an instance of the Fruit.APPLE enum to it. Then I've used the getColor() method to get the color of the fruit and I've compared the fruit with the string constant using the toString() method of the Enum class which returns the name of the constant.
Example 3: Java enum strings
public enum Shape {
CIRCLE("Circle"),
SQUARE("Square"),
TRIANGLE("Triangle");
private String name;
Shape(String name) {
this.name = name;
}
public String getName() {
return name;
}
}
public class Main {
public static void main(String[] args) {
Shape shape = Shape.CIRCLE;
System.out.println("Name of shape: " + shape.getName());
}
}
Output
Name of shape: Circle
Explanation:
In this example, I've defined an enum called Shape that contains three constants: CIRCLE, SQUARE, and TRIANGLE. Each constant has an associated string value that represents the name of the shape. The enum also has a constructor that takes a string and assigns it to the name field, and a getter method getName() that returns the name of the shape.
In the main method, I've created a variable of the Shape enum type and assigned an instance of the Shape.CIRCLE enum to it. Then I've used the getName() method to get the name of the shape and printed it.
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