JAVA 枚举的简单应用

编程技术  /  houtizong 发布于 3年前   90

public class Test {public static void main(String[] args) {for (Education e : Education.values()) {System.out.println("Name : " + e.getName() + " | Value : "+ e.getValue());}System.out.println(Education.Shuoshi.getName());System.out.println(Education.Benke.getValue());System.out.println("=================================================");double x = 5;double y = 10;for (Operation op : Operation.values()) {System.out.println(x + op.toString() + y + " = " + op.apply(x, y));}}}enum Education {Boshi("博士", 1), Shuoshi("硕士", 2), Benke("本科", 3), Gaozhong("高中", 4);private String name;private int value;private Education(String name, int value) {this.name = name;this.value = value;}public String getName() {return this.name;}public int getValue() {return this.value;}}enum Operation {PLUS("+") {@Overridedouble apply(double x, double y) {return x + y;}},MINUS("-") {@Overridedouble apply(double x, double y) {return x - y;}},TIMES("*") {@Overridedouble apply(double x, double y) {return x * y;}},DIVIDE("/") {@Overridedouble apply(double x, double y) {return x / y;}};private String symbol;private Operation(String symbol) {this.symbol = symbol;}abstract double apply(double x, double y);@Overridepublic String toString() {return this.symbol;}}

输出结果：
Name : 博士 | Value : 1
Name : 硕士 | Value : 2
Name : 本科 | Value : 3
Name : 高中 | Value : 4
硕士
3
=================================================
5.0+10.0 = 15.0
5.0-10.0 = -5.0
5.0*10.0 = 50.0
5.0/10.0 = 0.5

利用枚举实现java单例：包含一个元素的枚举：

enum Singleton{INSTANCE;public void doSomething(){//...}}