public class LCS {

private static int lcs(String str1, String str2) {

if (str1 == null || str2 == null ||

str1.length() == 0 || str2.length() == 0) return 0;

char[] chs1 = str1.toCharArray(), chs2 = str2.toCharArray();

int max = 0;

int current = 0;

int[][] temp = new int[chs1.length][chs2.length];

for (int i = 0; i < chs1.length; i++) {

temp[i][0] = chs1[i] == chs2[0] ? 1 : 0;

}

for (int i = 1; i < chs2.length; i++) {

temp[0][i] = chs2[i] == chs1[0] ? 1 : 0;

}

for (int i = 1; i < chs1.length; i++) {

for (int j = 1; j < chs2.length; j++) {

temp[i][j] = chs1[i] == chs2[j] ? temp[i - 1][j - 1] + 1 : 0;

max = temp[i][j] > max ? temp[i][j] : max;

}

}

return max;

}

public static void main(String[] args) {

System.out.println(lcs("123456", "134"));

}

}