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- <section class="sect1" title="Scheme types in Java" epub:type="subchapter" id="Scheme-types-in-Java">
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- <h2 class="title" style="clear: both">Scheme types in Java</h2>
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- <p>All Scheme values are implemented by sub-classes of ‘<code class="literal">java.lang.Object</code>’.
- </p>
- <p>Scheme symbols are implemented using <code class="literal">java.lang.String</code>.
- (Don’t be confused by the fact the Scheme sybols are represented
- using Java Strings, while Scheme strings are represented by
- <code class="literal">gnu.lists.FString</code>. It is just that the semantics of Java strings
- match Scheme symbols, but do not match mutable Scheme strings.)
- Interned symbols are presented as interned Strings.
- (Note that with JDK 1.1 string literals are automatically interned.)
- </p>
- <p>Scheme integers are implemented by <code class="literal">gnu.math.IntNum</code>.
- Use the make static function to create a new IntNum from an int or a long.
- Use the intValue or longValue methods to get the int or long value of
- an IntNum.
- </p>
- <p>A Scheme "flonum" is implemented by <code class="literal">gnu.math.DFloNum</code>.
- </p>
- <p>A Scheme pair is implemented by <code class="literal">gnu.lists.Pair</code>.
- </p>
- <p>A Scheme vector is implemented by <code class="literal">gnu.lists.FVectror</code>.
- </p>
- <p>Scheme characters are implemented using <code class="literal">gnu.text.Char</code>.
- </p>
- <p>Scheme strings are implemented using <code class="literal">gnu.lists.FString</code>.
- </p>
- <p>Scheme procedures are all sub-classes of <code class="literal">gnu.mapping.Procedure</code>.
- The "action" of a ‘<code class="literal">Procedure</code>’ is invoked by using one of
- the ‘<code class="literal">apply*</code>’ methods: ‘<code class="literal">apply0</code>’, ‘<code class="literal">apply1</code>’,
- ‘<code class="literal">apply2</code>’, ‘<code class="literal">apply3</code>’, ‘<code class="literal">apply4</code>’, or ‘<code class="literal">applyN</code>’.
- Various sub-class of ‘<code class="literal">Procedure</code>’ provide defaults
- for the various ‘<code class="literal">apply*</code>’ methods. For example,
- a ‘<code class="literal">Procedure2</code>’ is used by 2-argument procedures.
- The ‘<code class="literal">Procedure2</code>’ class provides implementations of all
- the ‘<code class="literal">apply*</code>’ methods <span class="emphasis"><em>except</em></span> ‘<code class="literal">apply2</code>’,
- which must be provided by any class that extends <code class="literal">Procedure2</code>.
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