Converting string arrays into Map

I have two string arrays keys and values

String[] keys = {a,b,c,d};

String[] values = {1,2,3,4};

What is the fastest way to convert them into a map? I know we can iterate through them. But, is there any utility present?

Faster than this?

Map<String,String> map = new HashMap<>();

if(keys.length == values.length){
    for(int index = 0; index < keys.length; index++){
        map.put(keys[index], values[index]);
    }
}

I purpose to you two very simple implementations. One with stream Api of Java 8, one without.

Java < 8 (without stream api)

if(keys.length != values.length) { 
    throw new IllegalArgumentException("Keys and Values need to have the same length."); 
}
Map<String,String> map = new HashMap<>();
for (int i = 0; i < keys.length; i++) {
    map.put(keys[i], values[i]);
}

Java > 8 (with stream api)

if(keys.length != values.length) { 
    throw new IllegalArgumentException("Keys and Values need to have the same length."); 
}
Map<String,String> map = IntStream.range(0, keys.length).boxed()
    .collect(Collectors.toMap(i -> keys[i], i -> values[i]));