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doc: update java.md (#914)

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* method intern can get a ref of the same string in the string pool

* doc: update java.md 3bcb61d409
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jaywcjlove
2025-01-02 03:12:12 +00:00
parent 2740054dcf
commit 8ababe8c6e
4 changed files with 22 additions and 20 deletions
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@ -252,10 +252,12 @@
</span><span class="code-line"><span class="token number">0</span> <span class="token number">1</span> <span class="token number">2</span> <span class="token number">3</span> <span class="token number">4</span> <span class="token number">5</span> <span class="token number">6</span> <span class="token number">7</span> <span class="token number">8</span> <span class="token number">9</span>
</span></code></pre>
</div></div></div><div class="wrap h3body-not-exist"><div class="wrap-header h3wrap"><h3 id="比较"><a aria-hidden="true" tabindex="-1" href="#比较"><span class="icon icon-link"></span></a>比较</h3><div class="wrap-body">
<pre class="language-java"><code class="language-java code-highlight"><span class="code-line"><span class="token class-name">String</span> s1 <span class="token operator">=</span> <span class="token keyword">new</span> <span class="token class-name">String</span><span class="token punctuation">(</span><span class="token string">"QuickRef"</span><span class="token punctuation">)</span><span class="token punctuation">;</span>
<pre class="language-java"><code class="language-java code-highlight"><span class="code-line"><span class="token class-name">String</span> s1 <span class="token operator">=</span> <span class="token string">"QuickRef"</span><span class="token punctuation">;</span>
</span><span class="code-line"><span class="token class-name">String</span> s2 <span class="token operator">=</span> <span class="token keyword">new</span> <span class="token class-name">String</span><span class="token punctuation">(</span><span class="token string">"QuickRef"</span><span class="token punctuation">)</span><span class="token punctuation">;</span>
</span><span class="code-line">s1 <span class="token operator">==</span> s2 <span class="token comment">// false</span>
</span><span class="code-line">s1<span class="token punctuation">.</span><span class="token function">equals</span><span class="token punctuation">(</span>s2<span class="token punctuation">)</span> <span class="token comment">// true</span>
</span><span class="code-line">s1 <span class="token operator">==</span> s2 <span class="token comment">// false</span>
</span><span class="code-line">s1<span class="token punctuation">.</span><span class="token function">equals</span><span class="token punctuation">(</span>s2<span class="token punctuation">)</span> <span class="token comment">// true</span>
</span><span class="code-line"><span class="token comment">// intern 方法获得字符串常量池中的惟一引用</span>
</span><span class="code-line">s1 <span class="token operator">==</span> s2<span class="token punctuation">.</span><span class="token function">intern</span><span class="token punctuation">(</span><span class="token punctuation">)</span> <span class="token comment">// true</span>
</span><span class="code-line"><span class="token string">"AB"</span><span class="token punctuation">.</span><span class="token function">equalsIgnoreCase</span><span class="token punctuation">(</span><span class="token string">"ab"</span><span class="token punctuation">)</span> <span class="token comment">// true</span>
</span></code></pre>
</div></div></div><div class="wrap h3body-not-exist"><div class="wrap-header h3wrap"><h3 id="操纵"><a aria-hidden="true" tabindex="-1" href="#操纵"><span class="icon icon-link"></span></a>操纵</h3><div class="wrap-body">
@ -302,7 +304,7 @@
</span><span class="code-line"><span class="token keyword">int</span><span class="token punctuation">[</span><span class="token punctuation">]</span> a4 <span class="token operator">=</span> <span class="token keyword">new</span> <span class="token keyword">int</span><span class="token punctuation">[</span><span class="token number">3</span><span class="token punctuation">]</span><span class="token punctuation">;</span>
</span><span class="code-line">a4<span class="token punctuation">[</span><span class="token number">0</span><span class="token punctuation">]</span> <span class="token operator">=</span> <span class="token number">1</span><span class="token punctuation">;</span>
</span><span class="code-line">a4<span class="token punctuation">[</span><span class="token number">2</span><span class="token punctuation">]</span> <span class="token operator">=</span> <span class="token number">2</span><span class="token punctuation">;</span>
</span><span class="code-line">a4<span class="token punctuation">[</span><span class="token number">3</span><span class="token punctuation">]</span> <span class="token operator">=</span> <span class="token number">3</span><span class="token punctuation">;</span>
</span><span class="code-line">a4<span class="token punctuation">[</span><span class="token number">3</span><span class="token punctuation">]</span> <span class="token operator">=</span> <span class="token number">3</span><span class="token punctuation">;</span> <span class="token comment">// 会出现索引越界异常</span>
</span></code></pre>
</div></div></div><div class="wrap h3body-not-exist"><div class="wrap-header h3wrap"><h3 id="修改-modify"><a aria-hidden="true" tabindex="-1" href="#修改-modify"><span class="icon icon-link"></span></a>修改 Modify</h3><div class="wrap-body">
<pre class="language-java"><code class="language-java code-highlight"><span class="code-line"><span class="token keyword">int</span><span class="token punctuation">[</span><span class="token punctuation">]</span> a <span class="token operator">=</span> <span class="token punctuation">{</span><span class="token number">1</span><span class="token punctuation">,</span> <span class="token number">2</span><span class="token punctuation">,</span> <span class="token number">3</span><span class="token punctuation">}</span><span class="token punctuation">;</span>