class Main {
public static void main(String[] args) {
String src = "周一是今天吗";
String des = "周一是今天";
float sd = LevenshteinDistance.getInstance().getSimilarityDegree(src,des);
System.out.println(sd);
}
}
/**
* 文本相似度匹配
* Levenshtein distance算法
*/
class LevenshteinDistance{
private static LevenshteinDistance _instance = null;
public static LevenshteinDistance getInstance(){
if (_instance == null){
return new LevenshteinDistance();
}
return _instance;
}
public int LowerOfThree(int first, int second, int third){
int min = first;
if (second < min)
min = second;
if (third < min)
min = third;
return min;
}
/**
* 文本相似度匹配
* Levenshtein distance算法
*/
public float getSimilarityDegree(String str1, String str2){
int val = 0;
if(str1==null||str2==null){
return 0.0f;
}
int n = str1.length();
int m = str2.length();
if (n == 0){
val = m;
}else if (m == 0){
val = n;
}else{
int[][] Matrix = new int[n + 1][ m + 1];
for (int i = 0; i <= n; i++){
Matrix[i][0] = i;
}
for (int j = 0; j <= m; j++){
Matrix[0][j] = j;
}
int temp = 0;
for (int i = 1; i <= n; i++){
for (int j = 1; j <= m; j++){
temp = str1.charAt(i-1) ==str2.charAt(j-1)?0:1;
Matrix[i][j] = LowerOfThree(Matrix[i-1][j] + 1, Matrix[i][j-1] + 1, Matrix[i-1][j-1] + temp);
}
}
val = Matrix[n][m];
}
int maxLen = n>m?n:m;
return 1 - (float)val/maxLen;
}
}
