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The class <code>Void</code> is used to hold a reference to the <code>Class</code> object representing the keyword <code>void</code>. It cannot be instantiated as <code>void</code> cannot be the type of any object. For example, <code>CompletableFuture<Void></code> signifies that a <code>CompletableFuture</code> performs a task that does not return a value.
The class <code>java.lang.Number</code> represents all numeric values which can be converted to <code>byte</code>, <code>double</code>, <code>float</code>, <code>int</code>, <code>long</code>, and <code>short</code>.
==Program structure==
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