枚举类的使用

枚举类的定义

1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
enum SeasonEnums {
//提供当前枚举类的对象
SPRING("春天", "春暖花开"), SUMMER("夏天", "夏日炎炎"), AUTUMN("秋天", "秋高气爽"), WINNER("冬天", "冰天雪地");

private final String name;
private final String desc;

SeasonEnums(String name, String desc) {
this.name = name;
this.desc = desc;
}

public String getName() {
return name;
}


public String getDesc() {
return desc;
}

@Override
public String toString() {
return "SeasonEnums{" +
"name='" + name + '\'' +
", desc='" + desc + '\'' +
'}';
}
}

枚举类的方法使用

1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
System.out.println(SeasonEnums.WINNER);


//1. values()获取所有的枚举对象
SeasonEnums[] values = SeasonEnums.values();
for (SeasonEnums value : values) {
System.out.println(value);
}
//2. valueOf(String str)通过枚举对象名,获取对应枚举对象信息
SeasonEnums spring = SeasonEnums.valueOf("SPRING");
System.out.println(spring);


/*
SeasonEnums{name='冬天', desc='冰天雪地'}
SeasonEnums{name='春天', desc='春暖花开'}
SeasonEnums{name='夏天', desc='夏日炎炎'}
SeasonEnums{name='秋天', desc='秋高气爽'}
SeasonEnums{name='冬天', desc='冰天雪地'}
SeasonEnums{name='春天', desc='春暖花开'}
*/

枚举类实现接口的方式

枚举类中实现抽象方法

1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
enum SeasonEnums implements Show {
//提供当前枚举类的对象
SPRING("春天", "春暖花开"), SUMMER("夏天", "夏日炎炎"), AUTUMN("秋天", "秋高气爽"), WINNER("冬天", "冰天雪地");

private final String name;
private final String desc;

SeasonEnums(String name, String desc) {
this.name = name;
this.desc = desc;
}

public String getName() {
return name;
}


public String getDesc() {
return desc;
}

@Override
public String toString() {
return "SeasonEnums{" +
"name='" + name + '\'' +
", desc='" + desc + '\'' +
'}';
}


//枚举类实现接口的一种方式
@Override
public void show() {
System.out.println("这是一个季节");
}
}

枚举对象中实现抽象方法

1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
enum SeasonEnums implements Show {
//提供当前枚举类的对象
SPRING("春天", "春暖花开"){
@Override
public void show() {
System.out.println("春天在哪里");
}
}, SUMMER("夏天", "夏日炎炎"){
@Override
public void show() {
System.out.println("宁夏");
}
}, AUTUMN("秋天", "秋高气爽"){
@Override
public void show() {
System.out.println("秋天不回来");
}
}, WINNER("冬天", "冰天雪地"){
@Override
public void show() {
System.out.println("大约在冬季");
}
};

private final String name;
private final String desc;

SeasonEnums(String name, String desc) {
this.name = name;
this.desc = desc;
}

public String getName() {
return name;
}


public String getDesc() {
return desc;
}

@Override
public String toString() {
return "SeasonEnums{" +
"name='" + name + '\'' +
", desc='" + desc + '\'' +
'}';
}

}