Download English Dictionary In Java
Sharmaine Kachmar
I was just seeing the difference between a HashMap and HashTable. Other than the obvious synchronized and unsynchronized difference, I noticed that HashTable extends the Dictionary class while HashMap implements Map. Both of them store pair, so what's the difference. I tried Googling for it and I found few questions on SO (1, 2 and 3). I didn't find anything satisfactory other than the fact that Dictionary class is obsolete. Is there any difference between thee two classes? If no, why is the dictionary class obsolete now?
The java.util.Dictionary class in Java is an abstract class that represents a collection of key-value pairs, where keys are unique and are used to access the values. It was part of the Java Collections Framework introduced in Java 1.2 but has been largely replaced by the java.util.Map interface since Java 1.2.
The Dictionary class is an abstract class and cannot be instantiated directly. Instead, it provides the basic operations for accessing the key-value pairs stored in the collection, which are implemented by its concrete subclass java.util.Hashtable.
The java.util.Dictionary class is a class in Java that provides a key-value data structure, similar to the Map interface. It was part of the original Java Collections framework and was introduced in Java 1.0.
Use this Scrabble dictionary checker tool to find out whether a word is acceptable in your scrabble dictionary. When you enter a word and click on Check Dictionary button, it simply tells you whether it's valid or not, and list out the dictionaries in case of valid word. Additionally, you can also read the meaning if you want to know more about a particular word.
When symbolizing geoelements in your map, you may need to convey several pieces of information with a single symbol. For example, you may want to symbolize restaurants so that each symbol reflects the type of food, price, rating, number of reviews, current health grade, seating capacity, average wait time, and so on. You can try to symbolize such data using a unique value renderer, but as the number of fields and values increases, that approach becomes impractical. With a dictionary renderer, however, you can build each symbol on the fly based on one or several attribute values and also handle a nearly infinite number of unique combinations.
Each component of a dictionary renderer's symbol is based on an attribute value and describes something about the geoelement it represents. This can be useful for data with attribute values that change frequently, since the symbol can update to show the current state of the geoelement. The following example shows a single symbol for a restaurant in which each component (symbol primitive) describes an aspect of the feature:
A dictionary renderer applies symbols to geoelements through an associated dictionary symbol style. The style contains all the required symbols as well as (for newer format styles) logic and configurable properties for applying them. For details, see the How a dictionary renderer works section below.
See the ArcGIS Pro documentation for information about using dictionary symbology in ArcGIS Pro . There is also an open source dictionary renderer toolkit with tools, instructions, and examples to help you create a custom dictionary style for use in ArcGIS Pro or apps built with this SDK.
A dictionary renderer applies symbols from an associated style file, stored in an SQLite database with a .stylx extension. Each symbol in the style is identified with a unique key. A style can be opened in ArcGIS Pro, and symbols can be added, deleted, or modified.
You can create your own dictionary style with the symbols you need as well as the logic for how they are applied. The logic for applying symbols from a dictionary style is implemented as an Arcade script and stored in the style file along with the symbols. A JSON definition of dictionary configuration properties (also stored in the style) allows you to define the expected attributes and other settings used by the style.
One or more symbols are read from a dictionary style to build a composite multilayer symbol for a geoelement. A dictionary renderer determines the symbol components to request for a geoelement's symbol (using symbol keys) based on input attribute values and style-specific logic. The Arcade code below, for example, reads the input value for the health inspection ($feature.healthgrade), determines the corresponding letter grade, and stores the appropriate key to return.
While you can open a dictionary style in ArcGIS Pro for editing symbols, you cannot access the Arcade logic or configuration there. You can use a utility for opening SQLite databases (such as DB Browser for SQLite), however, to view and edit those properties of the style.
Dictionary style properties include symbol properties, text properties, and configuration properties. Symbol and text properties define the attribute fields expected by the style to display symbols and text. Configuration properties provide settings to control specific aspects of their display. When the dictionary renderer is applied, expected attribute names in the symbol and text properties are automatically mapped to fields in the data that have a matching name. To use an input field that doesn't match an expected attribute, you can explicitly map the input field to one of the configured attribute names in the symbol or text properties. This allows more flexibility for applying a style to datasets that have different names for input fields or that have several fields with appropriate input values.
Automatic matching of input fields to expected fields in the dictionary properties in not case sensitive. The field "IDENTITY" will automatically match a configured field called "identity", for example.
The following example shows the configuration JSON for the restaurant dictionary style illustrated previously. In this case, there is only one configuration property, which is the ability to turn text display on or off. Symbol properties are defined with a list of the expected attributes for creating geoelement symbols. The text properties list contains attributes used to display text with the symbol (in this case, only a "name" field).
Dictionary styles for the military symbology standards MIL-STD 2525 and APP-6 support symbolizing control measure lines based on ordered anchor points, according to the specifications. These updated military dictionary styles can be downloaded from ArcGIS Online. To ensure this rule is applied, find the configuration that has the DictionarySymbolStyleConfiguration.getName() of "model" in the collection of dictionary symbol style configurations (DictionarySymbolStyle.getConfigurations()), then set the configuration value (DictionarySymbolStyleConfiguration.setValue()) to be "ORDERED ANCHOR POINTS".
A DictionaryRenderer will automatically read fields in your data that have names matching those required by the style specification. For any fields in your data that don't exactly match the expected names, map the field names by setting the DictionaryRenderer.getSymbologyFieldOverrides() and DictionaryRenderer.getTextFieldOverrides() properties of the dictionary renderer. These operations take a set of key-value pairs, in which the key is the expected attribute name (for example, healthgrade), and the value is the corresponding attribute name from the dataset (for example, inspection_score).
Military symbol dictionary styles allow you to choose whether to assemble and render the symbol based on a single attribute with a unique Symbol ID Code (SIC or SIDC) or based on a series of predefined attributes. For example, in MIL-STD-2525BC2, a SIC of SFSPCL--------- represents this symbol:
The ArcGIS Military Overlay is a solution for creating and sharing military overlays in ArcGIS Pro according to a specific schema (such as identity, symbol set, and so on), each having a range of valid values associated with it. This schema will work by default with the military symbol dictionary style.
This can be one of the standard military styles, or a custom dictionary style. Custom styles use the newer (Arcade-based) styles that have metadata with the specification name. The DictionarySymbolStyle.createFromFile() constructor is used for newer Arcade-based styles and will fail if you provide an older style.
If the input field names match the dictionary style's expected fields for symbols and text, they will be used to symbolize the data. If field names don't match (or you want to use different fields), you can explicitly map the expected fields to the appropriate fields in the data.
Field mapping overrides are defined with two sets of key-value pairs: one for symbol fields and one for text fields. Each key identifies an expected field (defined in the dictionary's symbol and text properties) and the value identifies the corresponding mapped field (from the dataset). Field names are not case sensitive.
As for sequences, the Java mapping does not create a separate named type for this definition. Instead, the dictionary is simply an instance of the generic type java.util.Map, where K is the mapping of the key type and V is the mapping of the value type. In the example above, EmployeeMap is mapped to the Java type java.util.Map. The following code demonstrates how to allocate and use an instance of EmployeeMap:
A stream is simply a byte-stream of data that is sent from a sender to a receiver. There are two basic categories, so the java.io package includes two abstract classes ( InputStream and OutputStream).
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