Example: Lookup enum by string value
public class EnumString {
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);
}
}
Output
BOLD
In the above program, we have an enum TextStyle which represents the different styles a block of text can have, i.e. Bold, Italics, Underline, Strikethrough.
We also have a string named style which holds the current style we want. However, it is not in all-caps.
We then use the enum TextStyle's valueOf() method to pass the style and get the enum value we require.
Since valueOf() takes a case-sensitive string value, we had to use the toUpperCase() method to convert the given string to upper case.
If, instead, we'd used:
TextStyle.valueOf(style)
the program would've thrown an exception No enum constant EnumString.TextStyle.Bold.