But i see that you can change the value in the constructor / methods of the class. Final 的作用 final 是 java 中的一个关键字，简而言之，final 的作用意味着“这是无法改变的”。不过由于 final 关键字一共有三种用法，它可以用来修饰变量、方法或者类，而且在修饰不同的地方时，效果、. How are they different ?
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The difference has to do with how memory is allocated.
215 what is the purpose of the final keyword in c++11 for functions?
I understand it prevents function overriding by derived classes, but if this is the case, then isn't it enough to declare. Use public final static string when you want to. The quote above is better in context. The quote was just elaborating on why such a constant would be static and final.
The reason it gives is that interface variables are intended to be java constants. Again, if the variable is Both final and const prevent a variable from being reassigned (similar to how final works in java or how const works in javascript). In java we use final keyword with variables to specify its values are not to be changed.
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