packagecom.miracle.luna.lambda;importjava.util.Arrays;/*** @Author Miracle Luna

* @Date 2019/6/9 23:40

* @Version 1.0*/

public enumAlarmGrade {

ATTENTION("attention", "提示"),

WARNING("warning","警告"),

SERIOUS("serious", "严重"),

FAULT("fault", "故障"),

UNKNOWN("unknown", "未知");privateString key;privateString name;/***@paramkey

*@paramname*/AlarmGrade(String key, String name) {this.key =key;this.name =name;

}/***@returnReturns the key.*/

publicString getKey() {returnkey;

}/***@returnReturns the name.*/

publicString getName() {returnname;

}/*** 根据Key获得枚举的Value

* 普通for循环遍历，比较判断

*

*@paramkey

*@return

*/

public staticAlarmGrade getEnumType(String key) {

AlarmGrade[] alarmGrades=AlarmGrade.values();for (int i = 0; i < alarmGrades.length; i++) {if(alarmGrades[i].getKey().equals(key)) {returnalarmGrades[i];

}

}returnAlarmGrade.UNKNOWN;

}/*** 根据Key获得枚举的Value

* 加强for循环遍历，比较判断

*

*@paramkey

*@return

*/

public staticAlarmGrade getEnumType1(String key) {

AlarmGrade[] alarmGrades=AlarmGrade.values();for(AlarmGrade alarmGrade : alarmGrades) {if(alarmGrade.getKey().equals(key)) {returnalarmGrade;

}

}returnAlarmGrade.UNKNOWN;

}/*** 根据Key获得枚举的Value

* Lambda表达式，比较判断(JDK 1.8)

*

*@paramkey

*@return

*/

public staticAlarmGrade getEnumType2(String key) {

AlarmGrade[] alarmGrades=AlarmGrade.values();

AlarmGrade result=Arrays.asList(alarmGrades).stream()

.filter(alarmGrade->alarmGrade.getKey().equals(key))

.findFirst().orElse(AlarmGrade.UNKNOWN);returnresult;

}/*** 根据Key获得枚举的Value

* Lambda表达式，比较判断(JDK 1.8)

*

*@paramkey

*@return

*/

public staticAlarmGrade getEnumType3(String key) {returnArrays.asList(AlarmGrade.values()).stream()

.filter(alarmGrade->alarmGrade.getKey().equals(key))

.findFirst().orElse(AlarmGrade.UNKNOWN);

}public static voidmain(String[] args) {

String grade= "attention";

System.out.println("第一种方式：普通for循环遍历，比较判断 \n" + grade + ": " +AlarmGrade.getEnumType(grade).getName());

System.out.println("\n第二种方式：加强for循环遍历，比较判断 \n" + grade + ": " +AlarmGrade.getEnumType1(grade).getName());

System.out.println("\n第三种方式：Lambda表达式，比较判断 \n" + grade + ": " +AlarmGrade.getEnumType2(grade).getName());

System.out.println("\n第四种方式：Lambda表达式，比较判断 \n" + grade + ": " +AlarmGrade.getEnumType3(grade).getName());

}

}