# Open Type

This dialog allows you to browse the workbench for a type to open in an editor or type hierarchy

- Enter type name prefix or pattern: In this field, type the first few characters of the type you want to select.

  The following pattern kinds are supported:

  Wildcards:
  - "*" for any string and "?" for any character
  - terminating "<" or " " (space) to prevent the automatic prefix matching, e.g. "java.*Access<" to match `java.util.RandomAccess` but not `java.security.AccessControlContext`
  Camel case:
  - "TZ" for types containing "T" and "Z" as upper-case letters in camel-case notation, e.g. `java.util.TimeZone`
  - "NuPoEx" or "NuPo" for types containing "Nu", "Po", (and "Ex") as parts in camel-case notation, e.g. `java.lang.NullPointerException`
  - terminating "<" or " " (space) to fix the number of camel-case parts, e.g. "HMap<" and "HaMap<" match "HashMap" and "HatMapper", but not "HashMapEntry" nor "Hashmap".

  Both pattern kinds also support package prefixes, e.g. "j.util.*Map<".

- Matching items: This list displays matches for the pattern you type in the Enter type name prefix or pattern field. Recently opened types show up in a history section at the top of the list.

The behavior of the Open Type dialog can be further customized using the dialog menu:

Open Type Options
Option | Description | Default
--- | --- | ---
Show Status Line | When selected, the Open Type dialog shows an additional bar at the bottom of the dialog which displays the package and containing JRE of the selected type | Show status line
Working Set actions | The search scope can be restricted by selecting one or more working sets or the global Window Working Set. | Show all types in the workspace.
Type Filters... | Types are hidden if they match the global Java type filters. | Show all types in the workspace.

Opening an editor on a type

Working sets
Type filters
Navigate actions