两个字符串的最大相同子串

public class TestsonString {
    public static void main(String[] args) {
        String s1 = "asdfkljasdCCTVCCTVfioejsdfunbsdfhh";
        String s2 = "asdfkasdiCCTVCCTVufasdfjh";
        sonStringOperation(s1,s2);
        
        System.out.println("\n================================================");
        String s3 = "abcdefgdcba";
        String s4 = "asdabcdfkasdiCCTVCCTVufasdfdcbajh";10         sonStringOperation(s3,s4);11     }     
    private static void sonStringOperation(String s1,String s2) { 
　　    if(s1 == null || s2 == null || s1.length() == 0 || s2.length() == 0)
    　     return;           15         String temp,s3; 
        if (s1.length() < s2.length()) {// 比较s1与s2长度，将较长的字符串赋给s1
            temp = s2;
            s2 = s1;
            s1 = temp;
        }
        int count = s2.length();// 将较短字符串的长度赋值给count
        int sum = (count + 1) * count / 2;// 计算得出所有可能结果的最大值sum
        String[] sonArray = new String[sum];// 分配sum个空间给sonArray数组
        int arrIndex = 0;// sonArray数组下标
        if (s1.contains(s2)) {
            System.out.println("最大子字符串为" + s2);
        } else if (!s1.contains(s2)) {
            for (int i = 0; i < s2.length(); i++) {
                for (int j = s2.length(); j > i; j--) {
                    s3 = s2.substring(i, j);// 将截取后的字符串赋值给s3
                    if (s1.contains(s3)) {// 如果s3为s1的子字符串，则将s3置入sonArray数组中
                        sonArray[arrIndex] = s3;
                        arrIndex++;
                    }
                }
            }
            if (sonArray[0] == null) {// 如果sonArray数组为空
                System.out.println("两个字符串之间没有相同的子字符串！");
                return;
            }
            temp = sonArray[0];
            count = 0;
            for (int i = 1; i < arrIndex; i++) {
                if (temp.length() < sonArray[i].length()) {
                    temp = sonArray[i];
                    count = 1;
                }else if(temp.length() == sonArray[i].length()) {
                    count++;
                }
            }
            System.out.print("两个字符串的相同的最大子字符串为：");
            for (int i = 0; i < arrIndex; i++) {
                if(temp.length()==sonArray[i].length())
                    System.out.print(sonArray[i]+" ");
            }
        }
    }
}