//enums/S.java package enums; public enum S{ A,B,C,D } //enums/Bur.java package enums; import static enums.S.*; public class Bur { S degree; public Bur(S degree) { this.degree = degree; } @Override public String toString() { return "Bur is " + degree; } public static void main(String[] args) { System.out.println(new Bur(A)); System.out.println(new Bur(B)); } } 注:若枚举定义在同一文件,或定义在默认包中,则无法使用该方式