CODEWITHSUNDEEP
javastringcomparison
codeDev
codeDev

Reputation: 79

Checking if an attribute is equal to a list of string values

According to a business requirement, I will need not check if the value of an attribute if it equal to a list of given string values. I am wondering what is the better way to do it, in case if someday there is a new value that needs to be added. Should these values be stored in a table?

List<String> values = new ArrayList<>();
values.add("value1");
values.add("value2");
values.add("value3");

if(values.contains(brand){
// if the brand contains the given values
// implement a specific logic
}

Thank you

Upvotes: 1

Views: 930

Answers (1)

WJS
WJS

Reputation: 40057

You could do it like this. If there was a Brand class that returned an immutable list of attributes.

Brand brand = new Brand(...);
List<String> values = new ArrayList<>();
values.add("value1");
values.add("value2");
values.add("value3");
if(brand.getAtrributes().containsAll(values)) {
    // do something.
}

But imo, it would be better to use an EnumSet and define the attributes as enums.

enum Attr {VALUE1, VALUE2, VALUE3,VALUE4, VALUE5};
EnumSet<Attr> attr = EnumSet.of(Attr.VALUE1, Attr.VALUE2, Attr.VALUE3, Attr.VALUE4, Attr.VALUE5);

if(attr.contains(Attr.VALUE1)) {
   // do something.
}

There is still a containsAll method as well as other potentially helpful methods.

  • create a record that takes an set of enums
  • create an instance of that with values 2-4.
  • And use the range feature to verify.
record Brand(EnumSet<Attr> getAttributes){}
Brand brand = new Brand(EnumSet.of(Attr.VALUE2,Attr.VALUE3, Attr.VALUE4));

EnumSet<Attr> required = EnumSet.range(Attr.VALUE2,Attr.VALUE4);

if (brand.getAttributes().containsAll(required)) {
    System.out.println("Good to go");
}

Prints

Good to go.

Upvotes: 4

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