大数据的加法运算Java代码实现

public static void add(String s1, String s2) {
        int[] x = new int[Math.max(s1.length(), s2.length())];
        int i = 0, j = Math.max(s1.length(), s2.length()) - Math.min(s1.length(), s2.length());
        if (s1.length() > s2.length()) {
            for (; i < j; i++) {
                int t = Integer.parseInt(String.valueOf(s1.charAt(i)));
                x[i] = t;
            }
            for (j = 0; i < s1.length() & j < s2.length(); i++, j++) {
                int t1 = Integer.parseInt(String.valueOf(s1.charAt(i)));
                int t2 = Integer.parseInt(String.valueOf(s2.charAt(j)));
                x[i] = t1 + t2;
            }
        } else {
            for (; i < j; i++) {
                int t = Integer.parseInt(String.valueOf(s2.charAt(i)));
                x[i] = t;
            }
            for (j = 0; i < s2.length() & j < s1.length(); i++, j++) {
                int t1 = Integer.parseInt(String.valueOf(s2.charAt(i)));
                int t2 = Integer.parseInt(String.valueOf(s1.charAt(j)));
                x[i] = t1 + t2;
            }
        }

        // 处理进位
        for (i = x.length - 1; i > 0; i--) {
            x[i - 1] = x[i - 1] + x[i] / 10;
            x[i] = x[i] % 10;
        }
        String res = new String();
        for (i = 0; i < x.length; i++) {
            res += x[i];
        }
        x = null;
        System.out.println("加法结果：" + res);
    }