在 Java 中使用 final 变量及其对方法的影响

Question

Im modifying a large class file. The easiest way to achieve what I want is to change the class' global variables to 'final' and set the value. But I havent used finals much. Will this cause a problem with the setter methods throughout the file? ie what happens when a setter cannot set the variable as the variable is final? An error? Or just ignored? Thanks.

Answer 1

If your fields are final , they must be set either on declaration or in the constructor. Once set, the compiler will throw an error when set again, because final variables are not allowed to be re-assigned.