How to get an enum value from a string value in Java?

Question

Say I have an enum which is just

public enum Blah {
    A, B, C, D
}

and I would like to find the enum value of a string, for example

Answer 1

Solution using Guava libraries. Method getPlanet () is case insensitive, so getPlanet ("MerCUrY") will return Planet.MERCURY.

package com.universe.solarsystem.planets;
import org.apache.commons.lang3.StringUtils;
import com.google.common.base.Enums;
import com.google.common.base.Optional;

//Pluto and Eris are dwarf planets, who cares!
public enum Planet {
   MERCURY,
   VENUS,
   EARTH,
   MARS,
   JUPITER,
   SATURN,
   URANUS,
   NEPTUNE;

   public static Planet getPlanet(String name) {
      String val = StringUtils.trimToEmpty(name).toUpperCase();
      Optional  possible = Enums.getIfPresent(Planet.class, val);
      if (!possible.isPresent()) {
         throw new IllegalArgumentException(val + "? There is no such planet!");
      }
      return possible.get();
   }
}