Java 如何将at开关语句的字符串转换为枚举?
我有以下代码,我希望接受命令行args fx“12 EUR”进行转换:Java 如何将at开关语句的字符串转换为枚举?,java,enums,switch-statement,command-line-arguments,Java,Enums,Switch Statement,Command Line Arguments,我有以下代码,我希望接受命令行args fx“12 EUR”进行转换: public class Main { enum Currency {EUR, USD, GBP,INVALID_CURRENCY; static final float C_EUR_TO_DKK_RATE = (float) 7.44; static final float C_USD_TO_DKK_RATE = (float) 5.11; static final float C_GBP_TO_
public class Main {
enum Currency {EUR, USD, GBP,INVALID_CURRENCY;
static final float C_EUR_TO_DKK_RATE = (float) 7.44;
static final float C_USD_TO_DKK_RATE = (float) 5.11;
static final float C_GBP_TO_DKK_RATE = (float) 8.44;
static float result = 0;
static int amount = 0;
/**
* @param args the command line arguments
*/
public static void main(String[] args) {
// Q1
if (args.length == 2) {
amount = Integer.parseInt(args[0]);
String currencyIn = args[1].toString();
Currency enumConversion = currencyIn; //**<---- HERE**
switch (enumConversion) {
case EUR:
result = amount * C_EUR_TO_DKK_RATE;
break;
case USD:
result = amount * C_USD_TO_DKK_RATE;
break;
case GBP:
result = amount * C_GBP_TO_DKK_RATE;
break;
default:
result = 0;
break;
}
System.out.println((float) amount + " " + enumConversion + " converts to "
+ Math.round(result*100.0)/100.0 + " DKK");
} else {
System.out.println("Invalid arguments!");
System.exit(1);
}
}
}
}
公共类主{
枚举货币{欧元、美元、英镑、无效的欧元;
静态最终浮动汇率C欧元兑丹麦克朗汇率=(浮动汇率)7.44;
静态最终浮动汇率C_美元兑丹麦克朗汇率=(浮动)5.11;
静态最终浮动C_英镑兑DKK_汇率=(浮动)8.44;
静态浮点结果=0;
静态整数金额=0;
/**
*@param指定命令行参数
*/
公共静态void main(字符串[]args){
//Q1
如果(args.length==2){
amount=Integer.parseInt(args[0]);
字符串currencyIn=args[1]。toString();
Currency enumConversion=currencyIn;//**从中,有一个方法可用于执行此操作
static <T extends Enum<T>> T valueOf(Class<T> enumType, String name)
static T valueOf(类枚举类型,字符串名称)
即
Currency enumConversion=Currency.valueOf(currencyIn);//**从中,可以使用一个方法来执行此操作
static <T extends Enum<T>> T valueOf(Class<T> enumType, String name)
static T valueOf(类枚举类型,字符串名称)
即
Currency enumConversion=Currency.valueOf(currencyIn);//**
public Currency fromString(String s){
try
{
return Currency.valueOf(s)
}
catch(IllegalArgumentException e)
{
return null;
}
}