找出两个字符串中最大公共子字符串,如"abccade","dgcadde"的最大子串为"cad"

package blut.Algorithms.mianshi;
import java.util.ArrayList;
import java.util.List;

/**
*找出两个字符串中最大公共子字符串,如"abccade","dgcadde"的最大子串为"cad"
* @author blut
*
*/
public class ZuiDaZiChuan {
public static void main(String args[]) {
String str1 = "abccade";
String str2 = "dgcadde";
List<String> str1Sub = new ArrayList<String>();
List<String> str2Sub = new ArrayList<String>();
List<String> listSame = new ArrayList<String>();

//将所有可能的字符串放到list中
for (int i = 0; i <= str1.length(); i++) {
for (int j = i; j <= str1.length(); j++) {
str1Sub.add(str1.substring(i, j));
}
}
//将所有可能的字符串放到list中
for (int i = 0; i <= str2.length(); i++) {
for (int j = i; j <= str2.length(); j++) {
str2Sub.add(str2.substring(i, j));
}
}
//讲相同的字符串放到listsame中
for (int i = 0; i < str1Sub.size(); i++) {
for (int j = 0; j < str2Sub.size(); j++) {
if (str1Sub.get(i).equals(str2Sub.get(j))) {
listSame.add(str1Sub.get(i));
}
}
}

//找出最大的相同的字符串
int maxId = 0;
int maxValue = 0;
for (int i = 0; i < listSame.size(); i++) {
if (listSame.get(i).length() > maxValue) {
maxId = i;
maxValue = listSame.get(i).length();
}
}
System.out.print(listSame.get(maxId));
}
}