对枚举类型的学习

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通过实例学习枚举类型：

实例一、

public enum FirstWeather {
Sunny("晴天"), Rainy("雨天"), Cloudy("多云");
private String value;// 私有成员变量，保存名称

public String getValue() {
return value;
}
FirstWeather(String value) {// 带参构造函数
this.value = value;
}

public static void main(String[] args) {
System.out.println(FirstWeather.Sunny.getValue());// 以下输出为"晴天"
FirstWeather w=FirstWeather.Cloudy;
System.out.println(w.getValue());// 以下输出为"多云"
}
}

实例二、

public enum SecondWeather {
Sunny(1,"晴天"), Rainy(2,"雨天"), Cloudy(3,"多云");
private int value;
private String label;

private SecondWeather(int value, String label) {
this.value = value;
this.label = label;
}

public int getValue() {
return value;
}

public String getLabel() {
return label;
}

public static SecondWeather parse(int value) {
SecondWeather result = SecondWeather.Sunny;
switch (value) {
case 1:
result = SecondWeather.Sunny;
break;
case 2:
result = SecondWeather.Rainy;
break;
case 3:
result = SecondWeather.Cloudy;
break;
}
return result;
}

public static List<SecondWeather> getEnumValues() {
return Arrays.asList(values());
}

public static void main(String[] args) {
System.out.println(SecondWeather.Sunny.getValue()+":"+SecondWeather.Sunny.getLabel());// 以下输出为"1:晴天"
SecondWeather w=SecondWeather.Cloudy;
System.out.println(w.getValue()+":"+w.getLabel());// 以下输出为"3:多云"
List<SecondWeather> list=getEnumValues();
for (SecondWeather sw:list) {
System.out.println(sw.value+"--"+sw.label);//依次输出：1--晴天、2--雨天、3--多云
}
}
}

实例三、

import java.util.Arrays;
import java.util.List;

public enum Weather {
Sunny(1,"晴天") {
@Override
public String test() {
return "今天阳光明媚！！！\n";
}
},

Rainy(2,"雨天") {
@Override
public String test() {
return "出门别忘带把雨伞哦！！！\n";
}
},

Cloudy(3,"多云") {
@Override
public String test() {
return "别出去登高望远了，你看不远的，呵呵呵！！！\n";
}
};

private int value;
private String label;

private Weather(int value, String label) {
this.value = value;
this.label = label;
}

public int getValue() {
return value;
}

public String getLabel() {
return label;
}

public abstract String test();

public static Weather parse(int value) {
Weather result = Weather.Sunny;
switch (value) {
case 1:
result = Weather.Sunny;
break;
case 2:
result = Weather.Rainy;
break;
case 3:
result = Weather.Cloudy;
break;
}
return result;
}

public static List<Weather> getEnumValues() {
return Arrays.asList(values());
}

public static void main(String[] args) {
System.out.println(Weather.Sunny.getValue()+":"+Weather.Sunny.getLabel());
Weather weather=Weather.Cloudy;
System.out.println(weather.getValue()+":"+weather.getLabel()+"\n\n");
List<Weather> list=getEnumValues();
for (Weather sw:list) {
System.out.println(sw.value+"--"+sw.label+"--"+sw.test());
}
}
}