public Tag withKey(String key) {
        setKey(key);
        return this;
    }
<p>
Part of the key:value pair that defines a tag. You can use a tag key to describe a category of information, such
as "customer." Tag keys are case-sensitive.
</p>

@param key
       Part of the key:value pair that defines a tag. You can use a tag key to describe a category of
       information, such as "customer." Tag keys are case-sensitive.
@return Returns a reference to this object so that method calls can be chained together.
aws-java-sdk-mediastore/src/main/java/com/amazonaws/services/mediastore/model/Tag.java