private Float parsePercentString(String percentString) {
    if (percentString.endsWith("%")) {
      percentString = percentString.substring(0, percentString.length() - 1);
    }
    return Float.valueOf(percentString);
  }
Represents a value of a field. The type of a value is defined by {@link FieldValue}.
hbase-hbtop/src/main/java/org/apache/hadoop/hbase/hbtop/field/FieldValue.java