Convert string to enum

public enum Shape { RECTANGLE, CIRCLE, LINE } 

The valueOf() method can be used to convert a string value to an enum value. Here is an example of reading in a Shape value from a Scanner object in.

drawing = Shape.valueOf(in.next());

or

drawing = Shape.valueOf("RECTANGLE") 

We can have custom methods to deal with this, if we dont want to have some extra customization.
eg. If the text is not the same to the enumeration value:

public enum Blah {
  A("text1"),
  B("text2"),
  C("text3"),
  D("text4");

  private String text;

  Blah(String text) {
    this.text = text;
  }

  public String getText() {
    return this.text;
  }

  public static Blah fromString(String text) {
    if (text != null) {
      for (Blah b : Blah.values()) {
        if (text.equalsIgnoreCase(b.text)) {
          return b;
      }
    }
    return null;
  }
}