{"id":202666,"date":"2025-05-22T09:09:36","date_gmt":"2025-05-22T01:09:36","guid":{"rendered":"https:\/\/server.hk\/cnblog\/202666\/"},"modified":"2025-05-22T09:09:36","modified_gmt":"2025-05-22T01:09:36","slug":"%e5%a6%82%e4%bd%95%e9%80%9a%e8%bf%87%e6%95%b0%e6%8d%ae%e7%bb%93%e6%9e%84%e9%80%89%e6%8b%a9%e4%bc%98%e5%8c%96java%e5%87%bd%e6%95%b0%e7%9a%84%e5%86%85%e5%ad%98%e4%bd%bf%e7%94%a8%ef%bc%9f","status":"publish","type":"post","link":"https:\/\/server.hk\/cnblog\/202666\/","title":{"rendered":"\u5982\u4f55\u901a\u8fc7\u6570\u636e\u7ed3\u6784\u9009\u62e9\u4f18\u5316Java\u51fd\u6570\u7684\u5185\u5b58\u4f7f\u7528\uff1f"},"content":{"rendered":"<p><b><\/b>     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(LIFO) \u539f\u5219\u7684\u6570\u636e\u7ed3\u6784\uff0c\u652f\u6301\u9ad8\u6548\u7684\u538b\u5165\u548c\u5f39\u51fa\u64cd\u4f5c\u3002<\/li>\n<li><strong>\u961f\u5217\uff1a<\/strong>\u9075\u5faa\u5148\u8fdb\u5148\u51fa (FIFO) 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O(1)\uff0c\u663e\u8457\u63d0\u9ad8\u4e86\u67e5\u627e\u6548\u7387\u3002<\/p>\n<pre>import java.util.HashMap;\n\npublic class IntLookup {\n\n    private HashMap&lt;Integer, Integer&gt; indexMap;\n\n    public IntLookup(int[] array) {\n        indexMap = new HashMap&lt;&gt;();\n        for (int i = 0; i &lt; array.length; i++) {\n            indexMap.put(array[i], i);\n        }\n    }\n\n    public int findIndex(int target) {\n        return indexMap.getOrDefault(target, -1);\n    }\n}<\/pre>\n<p><strong>\u7ed3\u8bba<\/strong><\/p>\n<p>\u901a\u8fc7\u4ed4\u7ec6\u9009\u62e9\u6570\u636e\u7ed3\u6784\uff0cJava 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