java - 为什么静态初始化 block 中不允许使用限定的静态最终变量？

Question

案例一

class Program {
    static final int var;

    static {
        Program.var = 8;  // Compilation error
    }

    public static void main(String[] args) {
        int i;
        i = Program.var;
        System.out.println(Program.var);
    }
}

案例2

class Program {
    static final int var;

    static {
        var = 8;  //OK
    }

    public static void main(String[] args) {
        System.out.println(Program.var);
    }
}

为什么Case 1会导致编译错误？

Answer 1

JLS 持有答案(注意粗体声明):

Similarly, every blank final variable must be assigned at most once; it must be definitely unassigned when an assignment to it occurs. Such an assignment is defined to occur if and only if either the simple name of the variable (or, for a field, its simple name qualified by this) occurs on the left hand side of an assignment operator. [§16]

这意味着在分配静态最终变量时必须使用“简单名称”——即不带任何限定符的 var 名称。