java 字符串加粗怎么设置 java 字符串加法

字符串转化为加法运算：

public class demo {
    public static void main(String[] args) {
        add("5555","5555");
    }

    public static void add(String a, String b){
        //反转
        String a1 = new StringBuffer(a).reverse().toString();
        String b1 = new StringBuffer(b).reverse().toString();

        int la = a1.length();
        int lb = b1.length();
        int maxl = la>lb? la: lb;
        //结果
        int[] Sum = new int[maxl+1];
        Sum[0] = 0;

        //进位
        int t = 0;

        //高位补零
        if (la <lb){
            for (int i = la; i< lb;i++){
                a1+="0";
            }
        }else if (la>lb){
            for (int i = lb; i < la; i++) {
                b1+="0";
            }
        }

        //相加运算
        for (int i = 0; i < Sum.length-1; i++) {
            int ai = Integer.parseInt(a1.charAt(i) + "");
            int bi = Integer.parseInt(b1.charAt(i) + "");
            int ci = Sum[i];
            t = ai + bi + ci;
            Sum[i]= t%10;
            Sum[i+1] = t/10;
        }

        //输出展示
        StringBuffer result = new StringBuffer();
        for (int i = Sum.length-1; i >= 0; i--) {
            if (i == Sum.length-1 && Sum[i] == 0) continue;
            result.append(Sum[i]);
        }
        System.out.println(result);
    }
}