gistfile1.java

public enum Foo {

  BAR(DEFAULT_VALUE), BAZ(44);

  private static final int DEFAULT_VALUE = 42;

  private int value;

  Foo(int value) {
    this.value = value;
  }

  /*
    Foo.java:3: illegal forward reference
      BAR(DEFAULT_VALUE), BAZ(44);
          ^
    1 error
  */

}

gistfile2.java

import java.util.HashMap;
import java.util.Map;

public enum Foo {

  BAR(""), BAZ("");

  private static final Map<String, Foo> fooMap = new HashMap<String, Foo>();
  static {
    for (Foo foo : values()) {
      fooMap.put(foo.getAlias(), foo);
    }
  }

  private String alias;

  Foo(String alias) {
    this.alias = alias;
  }

  public String getAlias() {
    return alias;
  }

  public static Foo fromAlias(String alias) {
    return fooMap.get(alias);
  }

}