Here you can find the source of lcs(String str1, String str2)
public static int lcs(String str1, String str2)
//package com.java2s; //License from project: Open Source License public class Main { public static int lcs(String str1, String str2) { int len1 = str1.length(); int len2 = str2.length(); int c[][] = new int[len1 + 1][len2 + 1]; for (int i = 0; i <= len1; i++) { for (int j = 0; j <= len2; j++) { if (i == 0 || j == 0) { c[i][j] = 0;/*from w w w .ja v a2 s. co m*/ } else if (str1.charAt(i - 1) == str2.charAt(j - 1)) { c[i][j] = c[i - 1][j - 1] + 1; } else { c[i][j] = Math.max(c[i - 1][j], c[i][j - 1]); } } } return c[len1][len2]; } }