Java – Convert String to Enum object
In Java, you can use Enum valueOf()
to convert a String to an Enum object, review the following case study :
1. Java Enum example
WhoisRIR.java
package com.mkyong.whois.utils;
public enum WhoisRIR {
ARIN("whois.arin.net"),
RIPE("whois.ripe.net"),
APNIC("whois.apnic.net"),
AFRINIC("whois.afrinic.net"),
LACNIC("whois.lacnic.net"),
JPNIC("whois.nic.ad.jp"),
KRNIC("whois.nic.or.kr"),
CNNIC("ipwhois.cnnic.cn"),
UNKNOWN("");
private String url;
WhoisRIR(String url) {
this.url = url;
}
public String url() {
return url;
}
}
2. Problem
Given a String “arin”, how to convert it back to the above Enum object?
TestEnum.java
package com.mkyong.whois.utils;
public class TestEnum {
public static void main(String[] args) {
//How to convert this?
WhoisRIR rir = "arin";
}
}
3. Solution
To solve it, you can use enum valueOf()
function and convert a String to an Enum object.
TestEnum.java
package com.mkyong.whois.utils;
import java.util.Locale;
public class Test {
public static void main(String[] args) {
// Solution : Uses valueOf()
System.out.println(WhoisRIR.valueOf("arin".toUpperCase()));
// Recommended Solution : add locale
WhoisRIR rir = WhoisRIR.valueOf("ripe".toUpperCase(Locale.ENGLISH));
System.out.println(rir);
System.out.println(rir.url());
// Error, no enum constant, case sensitive
//System.out.println(WhoisRIR.valueOf("arin"));
}
}
Output
ARIN RIPE whois.ripe.net
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