插值模擬（字符串格式化）

Question

這裏有一個例子：

int n1 = 20; 
int n2 = 40; 
String output = String.format("Some guy is **%d** years old while the other is **%d** ", n1, n2); 
System.out.println(output); 

爲什麼這個不行？

Answer 1

我覺得效果很好，當我測試，它會打印爲初級講座：

Some guy is 20 years old while the other is 40