Lookup Enum by String value in Java

public class EnumStringStyle {
    public enum TextStyle {
        BOLD, ITALICS, UNDERLINE, STRIKETHROUGH
    }
    public static void main(String[] args) {
        String style = "Bold";
        TextStyle textStyle = TextStyle.valueOf(style.toUpperCase());
        System.out.println(textStyle);
    }
} 

BOLD

• This program delineates the usage of valueOf() function, for transforming a String into an enum.
• One thing to be noticed here is that enum is employed to contain un-modifiable final variables.
• Here TextStyle enum holds around four varieties of styles namely, BOLD, italics, UnderLine and StrikeThrough.
• Also the desired style is declared i.e. ‘Bold’ as of now; and is assigned to variable ‘style’.
• Since it is not in the form of capital letters, therefore toUpperCase() function turns all the letters of the string to upper case.
• All the letters are supposed to be in upper case as valueOf() method is sensitive to the case in which the characters are.
• In other case, the code would display a message: No enum constant EnumString.TextStyle.Bold, indicating that no such style exists.
• Finally, ‘style’ string is passed as an argument to valueOf() function, and that function is called upon TextStyle enum.
• The results BOLD are assigned to textStyle instance, and then displayed on the console.