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Java Program to Lookup enum by String value
In this article, we will understand how to lookup enum by string value. An enum is a special "class" that represents a group of constants (unchangeable variables, like final variables).
Below is a demonstration of the same −
Suppose our input is −
The string is to lookup is: Java
The desired output would be −
The result is: JAVA
Algorithm
Step 1 - START Step 2 - Declare a string namely input_string, an object of Languages namely result. Step 3 - Define the values. Step 4 - Use the function .valueOf() to fetch the string from the enum function. Step 5 - Display the result Step 6 - Stop
Example 1
Here, we use valueOf() to print the enum values.
public class Demo { public enum Languages { JAVA, SCALA, PYTHON, MYSQL } public static void main(String[] args) { String input_string = "Java"; System.out.println("The string is to lookup is: " +input_string); Languages result = Languages.valueOf(input_string.toUpperCase()); System.out.println("\nThe result is: "); System.out.println(result); } }
Output
The string is to lookup is: Java The result is: JAVA
Example 2
Here, we use .name() function to print the ENUM values..
enum Languages { Java, Scala, Python, Mysql; } public class Demo { public static void main(String[] args) { System.out.println("The values of the ENUM are: "); System.out.println(Languages.Java.name()); System.out.println(Languages.Scala.name()); System.out.println(Languages.Python.name()); System.out.println(Languages.Mysql.name()); } }
Output
The values of the ENUM are: Java Scala Python Mysql
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