有没有办法将字符串(特别是冒号)插入到整型变量中？

num = 123
string = "456"
result = str(num) + string
print(result)

int num = 123;
String string = "456";
String result = Integer.toString(num) + string;
System.out.println(result);

let num = 123;
let string = "456";
let result = num.toString() + string;
console.log(result);