static final成员变量的初始化时机

时机1：直接赋值

public class Test {

    static final double PI = 3.14159265;

}

时机2：静态代码块

public class Test {

    static final double PI;

    static {
        PI = 3.14159265;
    }

}

除了以上两个时机为static final赋值外，无其他办法。编译器也会报错“Variable 'PI' might not have been initialized.”