How can we compare a string with the values of enum elements in Java

Question

I have an enum Foo

public enum Foo {

    A("first"),

    B("second"),

    private final String value;

    private Foo(String value) {
        this.value = value;
    }

    public String value() {
        return this.value;
    }

}

Below I am trying to check if a string is contained in my enum.

public boolean isValidFoo(String fooStr) {
return EnumSet.allOf(Foo.class)
                        .contains(Foo.valueOf(fooStr.toUpperCase()));
}

This works when I send A or B for fooStr. How to make it work when I send first or second for fooStr?

don't call valueOf(), call value(); that's the name of your method that returns the value. Better yet, rename it getValue(), it 'll make the distinction more clear — Stultuske
– Stultuske, Commented Sep 20, 2019 at 7:08
You can create a Set with Arrays.stream(Foo.values()).map(Foo::value).collect(toSet()), store this Set in a static field somewhere, and use theSet.contains(fooStr). — Andy Turner
– Andy Turner, Commented Sep 20, 2019 at 7:19
possibilities, depends on usage: use streams with map and filter to find enum; static HashMap created at start mapping values to enum; a static Set also created at start containing all values; or ... — user85421
– user85421, Commented Sep 20, 2019 at 7:22
@Stultuske I do not understand how calling value would help in that? (contains checks for an enum instance) — user85421
– user85421, Commented Sep 20, 2019 at 7:24
@CarlosHeuberger it's the name of his getter, that's how he gets the value. — Stultuske
– Stultuske, Commented Sep 20, 2019 at 7:26

Rowi · Accepted Answer · 2019-09-20 07:43:04Z

0

You can try this..

public boolean isValidFoo(String fooStr) {
    return Arrays.stream(Foo.values())
            .anyMatch(e -> e.value.equals(fooStr));
}

answered Sep 20, 2019 at 7:43

Rowi

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1 Comment

user85421 Over a year ago

add map(Foo::value) instead of using e.value (when using functional, lets stay functional)

jack · Accepted Answer · 2019-09-20 08:15:09Z

0

You can add a method

  public static Foo getEnum(String value) {
        for (Foo foo : Foo.values()) {
            if (foo.value.equals(value)) {
                return foo;
            }
        }
        return null;
  }

answered Sep 20, 2019 at 8:15

jack

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