enum还有人记得吗？

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enum其实挺好用的，特别是对于一些固定的东西！

package com.pki.test;import sun.security.pkcs11.wrapper.CK_MECHANISM;enum KeyAlg {// 枚举常量放在第一行SM2("SM3withSM2"), RSA("SHA1withRSA");public final int keySize;public final String signName;public final CK_MECHANISM mechanism;public final CK_MECHANISM signMechanism;public final boolean isSM2;// 枚举的构造必须是私有的private KeyAlg(String signName) {this.signName = signName;if (name().equals("SM2")) {keySize = 256;mechanism = new CK_MECHANISM(0x80008201L);signMechanism = new CK_MECHANISM(0x80008101L);isSM2 = true;} else {keySize = 1024;mechanism = new CK_MECHANISM(0x80008201L);signMechanism = new CK_MECHANISM(0x1L);isSM2 = false;}}// 空构造是默认的private KeyAlg() {keySize = -1;signName = null;mechanism = null;signMechanism = null;isSM2 = false;}}public class EnumTest {static KeyAlg keyAlg = KeyAlg.RSA;public static void main(String[] args) {// 枚举常量的名System.out.println(keyAlg.name());// 该常量在枚举中的位置System.out.println(keyAlg.ordinal());// 通过name得到枚举常量System.out.println(KeyAlg.valueOf("SM2").name());}}

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