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It inherits Enum and AbstractMap classes.</p> <p>the Parameters for java.util.EnumMap class.</p> <p>K: It is the type of keys maintained by this map.
V: It is the type of mapped values.</p> <h2 id="enum-map-book-example"><a href="#enum-map-book-example" class="header-anchor">#</a> Enum Map Book Example</h2> <div class="language-java extra-class"><pre class="language-java"><code><span class="token keyword">import</span> <span class="token namespace">java<span class="token punctuation">.</span>util<span class="token punctuation">.</span></span><span class="token operator">*</span><span class="token punctuation">;</span>
<span class="token keyword">class</span> <span class="token class-name">Book</span> <span class="token punctuation">{</span>
<span class="token keyword">int</span> id<span class="token punctuation">;</span>
<span class="token class-name">String</span> name<span class="token punctuation">,</span>author<span class="token punctuation">,</span>publisher<span class="token punctuation">;</span>
<span class="token keyword">int</span> quantity<span class="token punctuation">;</span>
<span class="token keyword">public</span> <span class="token class-name">Book</span><span class="token punctuation">(</span><span class="token keyword">int</span> id<span class="token punctuation">,</span> <span class="token class-name">String</span> name<span class="token punctuation">,</span> <span class="token class-name">String</span> author<span class="token punctuation">,</span> <span class="token class-name">String</span> publisher<span class="token punctuation">,</span> <span class="token keyword">int</span> quantity<span class="token punctuation">)</span> <span class="token punctuation">{</span>
<span class="token keyword">this</span><span class="token punctuation">.</span>id <span class="token operator">=</span> id<span class="token punctuation">;</span>
<span class="token keyword">this</span><span class="token punctuation">.</span>name <span class="token operator">=</span> name<span class="token punctuation">;</span>
<span class="token keyword">this</span><span class="token punctuation">.</span>author <span class="token operator">=</span> author<span class="token punctuation">;</span>
<span class="token keyword">this</span><span class="token punctuation">.</span>publisher <span class="token operator">=</span> publisher<span class="token punctuation">;</span>
<span class="token keyword">this</span><span class="token punctuation">.</span>quantity <span class="token operator">=</span> quantity<span class="token punctuation">;</span>
<span class="token punctuation">}</span>
<span class="token punctuation">}</span>
<span class="token keyword">public</span> <span class="token keyword">class</span> <span class="token class-name">EnumMapExample</span> <span class="token punctuation">{</span>
<span class="token comment">// Creating enum </span>
<span class="token keyword">public</span> <span class="token keyword">enum</span> <span class="token class-name">Key</span><span class="token punctuation">{</span>
<span class="token class-name">One</span><span class="token punctuation">,</span> <span class="token class-name">Two</span><span class="token punctuation">,</span> <span class="token class-name">Three</span>
<span class="token punctuation">}</span><span class="token punctuation">;</span>
<span class="token keyword">public</span> <span class="token keyword">static</span> <span class="token keyword">void</span> <span class="token function">main</span><span class="token punctuation">(</span><span class="token class-name">String</span><span class="token punctuation">[</span><span class="token punctuation">]</span> args<span class="token punctuation">)</span> <span class="token punctuation">{</span>
<span class="token class-name">EnumMap</span><span class="token generics"><span class="token punctuation"><</span><span class="token class-name">Key</span><span class="token punctuation">,</span> <span class="token class-name">Book</span><span class="token punctuation">></span></span> map <span class="token operator">=</span> <span class="token keyword">new</span> <span class="token class-name">EnumMap</span><span class="token generics"><span class="token punctuation"><</span><span class="token class-name">Key</span><span class="token punctuation">,</span> <span class="token class-name">Book</span><span class="token punctuation">></span></span><span class="token punctuation">(</span><span class="token class-name">Key</span><span class="token punctuation">.</span><span class="token keyword">class</span><span class="token punctuation">)</span><span class="token punctuation">;</span>
<span class="token comment">// Creating Books </span>
<span class="token class-name">Book</span> b1<span class="token operator">=</span><span class="token keyword">new</span> <span class="token class-name">Book</span><span class="token punctuation">(</span><span class="token number">101</span><span class="token punctuation">,</span><span class="token string">"Let us C"</span><span class="token punctuation">,</span><span class="token string">"Yashwant Kanetkar"</span><span class="token punctuation">,</span><span class="token string">"BPB"</span><span class="token punctuation">,</span><span class="token number">8</span><span class="token punctuation">)</span><span class="token punctuation">;</span>
<span class="token class-name">Book</span> b2<span class="token operator">=</span><span class="token keyword">new</span> <span class="token class-name">Book</span><span class="token punctuation">(</span><span class="token number">102</span><span class="token punctuation">,</span><span class="token string">"Data Communications & Networking"</span><span class="token punctuation">,</span><span class="token string">"Forouzan"</span><span class="token punctuation">,</span><span class="token string">"Mc Graw Hill"</span><span class="token punctuation">,</span><span class="token number">4</span><span class="token punctuation">)</span><span class="token punctuation">;</span>
<span class="token class-name">Book</span> b3<span class="token operator">=</span><span class="token keyword">new</span> <span class="token class-name">Book</span><span class="token punctuation">(</span><span class="token number">103</span><span class="token punctuation">,</span><span class="token string">"Operating System"</span><span class="token punctuation">,</span><span class="token string">"Galvin"</span><span class="token punctuation">,</span><span class="token string">"Wiley"</span><span class="token punctuation">,</span><span class="token number">6</span><span class="token punctuation">)</span><span class="token punctuation">;</span>
<span class="token comment">// Adding Books to Map </span>
map<span class="token punctuation">.</span><span class="token function">put</span><span class="token punctuation">(</span><span class="token class-name">Key<span class="token punctuation">.</span>One</span><span class="token punctuation">,</span> b1<span class="token punctuation">)</span><span class="token punctuation">;</span>
map<span class="token punctuation">.</span><span class="token function">put</span><span class="token punctuation">(</span><span class="token class-name">Key<span class="token punctuation">.</span>Two</span><span class="token punctuation">,</span> b2<span class="token punctuation">)</span><span class="token punctuation">;</span>
map<span class="token punctuation">.</span><span class="token function">put</span><span class="token punctuation">(</span><span class="token class-name">Key<span class="token punctuation">.</span>Three</span><span class="token punctuation">,</span> b3<span class="token punctuation">)</span><span class="token punctuation">;</span>
<span class="token comment">// Traversing EnumMap </span>
<span class="token keyword">for</span><span class="token punctuation">(</span><span class="token class-name">Map<span class="token punctuation">.</span>Entry</span><span class="token generics"><span class="token punctuation"><</span><span class="token class-name">Key</span><span class="token punctuation">,</span> <span class="token class-name">Book</span><span class="token punctuation">></span></span> entry<span class="token operator">:</span>map<span class="token punctuation">.</span><span class="token function">entrySet</span><span class="token punctuation">(</span><span class="token punctuation">)</span><span class="token punctuation">)</span><span class="token punctuation">{</span>
<span class="token class-name">Book</span> b<span class="token operator">=</span>entry<span class="token punctuation">.</span><span class="token function">getValue</span><span class="token punctuation">(</span><span class="token punctuation">)</span><span class="token punctuation">;</span>
<span class="token class-name">System</span><span class="token punctuation">.</span>out<span class="token punctuation">.</span><span class="token function">println</span><span class="token punctuation">(</span>b<span class="token punctuation">.</span>id<span class="token operator">+</span><span class="token string">" "</span><span class="token operator">+</span>b<span class="token punctuation">.</span>name<span class="token operator">+</span><span class="token string">" "</span><span class="token operator">+</span>b<span class="token punctuation">.</span>author<span class="token operator">+</span><span class="token string">" "</span><span class="token operator">+</span>b<span class="token punctuation">.</span>publisher<span class="token operator">+</span><span class="token string">" "</span><span class="token operator">+</span>b<span class="token punctuation">.</span>quantity<span class="token punctuation">)</span><span class="token punctuation">;</span>
<span class="token punctuation">}</span>
<span class="token punctuation">}</span>
<span class="token punctuation">}</span>
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