java在向字符串添加整数或双精度时，是否需要强制转换为字符串？

Question

如果我有

'String t = "";
int i = 1;
double d = 3.3;'

我可以吗 t = t + " " + i + " " + d 还是我要投

Answer 1

试试看：

    double total = 10; 
    String total = String.valueOf(total);

Answer 2

是的，你可以。。不需要投

只要你能像你说的那样做t = t + " " + i + " " + d;

Answer 3

不，你没有

t = t + " " + i + " " + d  > "New" String = string + " " + String.valueOf(integer) + " " + String.valueOf(double)