String.format()的简单用法

String.format()???????,?????????????????????????????????,??????????????????????

???????:

1. ??%s??????:

String name = "John";
String message = String.format("Hello, %s!", name);
System.out.println(message);

??:

Hello, John!

2. ??%d?????:

int age = 25;
String message = String.format("I am %d years old.", age);
System.out.println(message);

??:

I am 25 years old.

3. ??%f??????:

double price = 9.99;
String message = String.format("The price is %.2f dollars.", price);
System.out.println(message);

??:

The price is 9.99 dollars.

????????,???????????????????,??s?????????10??????,=????????3?????????????????????Java?????