檢查兩個字符串的相似度

package com.epxing.commons.utils;
/**
 * 檢查兩個字符串的相似度
 * @author Administrator
 *
 */
public class CheckSimilar {
private int compare(String str, String target) {
int d[][]; // 矩陣
int n = str.length();
int m = target.length();
int i; // 遍歷str的
int j; // 遍歷target的
char ch1; // str的
char ch2; // target的
int temp; // 記錄相同字符,在某個矩陣位置值的增量,不是0就是1
if (n == 0) {
return m;
}
if (m == 0) {
return n;
}
d = new int[n + 1][m + 1];
for (i = 0; i <= n; i++) { // 初始化第一列
d[i][0] = i;
}


for (j = 0; j <= m; j++) { // 初始化第一行
d[0][j] = j;
}
for (i = 1; i <= n; i++) { // 遍歷str
ch1 = str.charAt(i - 1);
// 去匹配target
for (j = 1; j <= m; j++) {
ch2 = target.charAt(j - 1);
if (ch1 == ch2) {
temp = 0;
} else {
temp = 1;
}
// 左邊+1,上邊+1, 左上角+temp取最小
d[i][j] = min(d[i - 1][j] + 1, d[i][j - 1] + 1, d[i - 1][j - 1]
+ temp);
}
}
return d[n][m];
}


private int min(int one, int two, int three) {
return (one = one < two ? one : two) < three ? one : three;
}


/**
* 獲取兩字符串的相似度
* 
* @param str
* @param target
* @return
*/
public float getSimilarityRatio(String str, String target) {
return 1 - (float) compare(str, target)
/ Math.max(str.length(), target.length());
}
public static void main(String[] args) {
CheckSimilar lt = new CheckSimilar();
String str = "1#2203NO525FANGXIEROADHUANGPUDISTRICTSHANGHAICHINA";
String target = "1#2203NO525FANGXIEROADSHANGHAICN";
System.out.println("相似度="
+ lt.getSimilarityRatio(str, target));
}
}