java - JAVA中编译器内联的编译时常量表达式值是什么？

Question

最近我在读我得到了这个

"When you declare a String (which is immutable) variable as final, and initialize it with a compile-time constant expression, it also becomes a compile-time constant expression, and its value is inlined by the compiler where it is used."

和“我真的很困惑，这意味着它的值是由编译器内联的”？如果可能，请用简单的方式解释它

Source of the above line

Answer 1

当一个字符串在编译时完成并初始化时，编译器可以将字符串复制粘贴到代码中，而不是在每次使用时查找变量。类似于 inline expansion .

final String a = "asd";
String b = a;

上面的代码片段变成了

final String a = "asd";
String b = "asd";