这样调用时,每次都要重新加载一次词典,有没有办法让词典只加载一次
时间: 2024-03-16 14:45:46 浏览: 25
是的,你可以将词典加载到静态块或单例模式中,这样就可以保证词典只会被加载一次。下面是JAVA实现的单例模式示例代码:
```java
import java.util.HashMap;
import java.util.Map;
public class CustomDictionary {
private static CustomDictionary instance = null;
private Map<String, Map<String, Integer>> dictionary = new HashMap<>();
private CustomDictionary() {
addWord("apple");
addWord("banana");
addWord("orange");
}
public static CustomDictionary getInstance() {
if (instance == null) {
instance = new CustomDictionary();
}
return instance;
}
public String findMostSimilarWord(String word) {
Map<String, Integer> vector1 = toVector(word);
double maxSimilarity = -1.0;
String mostSimilarWord = null;
for (String term : dictionary.keySet()) {
Map<String, Integer> vector2 = dictionary.get(term);
double similarity = cosineSimilarity(vector1, vector2);
if (similarity > maxSimilarity) {
maxSimilarity = similarity;
mostSimilarWord = term;
}
}
return mostSimilarWord;
}
private Map<String, Integer> toVector(String text) {
Map<String, Integer> vector = new HashMap<>();
String[] terms = text.split("\\s+");
for (String term : terms) {
if (vector.containsKey(term)) {
vector.put(term, vector.get(term) + 1);
} else {
vector.put(term, 1);
}
}
return vector;
}
private double cosineSimilarity(Map<String, Integer> vector1, Map<String, Integer> vector2) {
double dotProduct = 0.0;
double magnitude1 = 0.0;
double magnitude2 = 0.0;
for (String term : vector1.keySet()) {
if (vector2.containsKey(term)) {
dotProduct += vector1.get(term) * vector2.get(term);
}
magnitude1 += Math.pow(vector1.get(term), 2);
}
for (String term : vector2.keySet()) {
magnitude2 += Math.pow(vector2.get(term), 2);
}
double magnitude = Math.sqrt(magnitude1) * Math.sqrt(magnitude2);
if (magnitude == 0) {
return 0.0;
}
return dotProduct / magnitude;
}
private void addWord(String word) {
String[] terms = word.split("\\s+");
for (String term : terms) {
if (term.length() > 0) {
Map<String, Integer> vector = toVector(term);
dictionary.put(term, vector);
}
}
}
public static void main(String[] args) {
CustomDictionary dictionary = CustomDictionary.getInstance();
String newWord = "pear";
String mostSimilarWord = dictionary.findMostSimilarWord(newWord);
System.out.println("与" + newWord + "最相似的词语是:" + mostSimilarWord);
}
}
```
在上述代码中,通过将构造方法设置为私有,同时增加一个getInstance()静态方法,实现单例模式,这样在程序运行时,只会初始化一次CustomDictionary实例,初始化时会自动加载词典。在main()方法中,我们获取CustomDictionary实例,并传入一个新词,程序会输出与新词最相似的词语。
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