public class MyTest6 { public static String printWhenInit(String s){ System.out.println(s); return s.substring(s.indexOf(" ")); } public static void main(String[] args){ System.out.println(SubI.iField3); //静态的运行时才能确定的常量，这时存有该常量的接口被初始化，其父类不会被初始化 // System.out.println(SubI.iField2); //静态的编译器可以确定的常量，这时三个接口都不会被初始化，原因和类一样 } } interface SuperI { public static final String superField = MyTest6.printWhenInit(" initializing SuperI.superField "); } interface I extends SuperI{ public static final String iField = MyTest6.printWhenInit("initializing I.iField "); public static final String iField2 = "heihie"; public static final String iField3 = UUID.randomUUID().toString(); } interface SubI extends I { public static final String subField = MyTest6.printWhenInit(" initializing SubI.subField "); } 你运行下这个就看到了，打印了initializing I.iField说明I初始化了，但是没打印initializing SuperI.superField说明父接口没有初始化