获取两个字符串中最大的相同子串

class  Test{

    public static void main(String[] args) {
        String a="abcwerthelloadcedf";
        String b="cdhelloesadcedf";
        String c=getSonString(a,b);
        System.out.println(c);
    }

    private static String getSonString(String a, String b) {
        String max=null;
        String min=null;
        String temp="";
        if (a.length()>b.length()) {
             max=a;
             min=b;
        }else {
             max=b;
             min=a;
        }
        for (int i = 0; i <min.length(); i++) {
            for (int j = 0; j <=i; j++) {
                String substring = min.substring(j, min.length()-i+j);//从小的字符串开始，从左向右移位比较
                if (max.contains(substring)) {
                    if(temp.length()<substring.length()) {
                        temp=substring;
                    }
                }
            }
            
        }
        
        return temp;
    }