I have a String[][]. So it basically looks like this:
{
{ "Dublin", "NYC"},
{ "Moscow", "Los-Angeles"},
{ "London", "Paris" }
}
And I have to add them to Map, so that Keys will be first column(Dublin, Moscow, London), and Values will be second (NYC, LA, Paris)
Can you please help, I don't know where to start
Create map
HashMap<String, String> map = new HashMap<String, String>();
Loop over data ( String[][]). Each array in data is your key and value. Add them to map
for (String[] keyValue : data) {
map.put(keyValue[0],keyValue[1]);
}
To add this array elements into a Map, you just need to use a loop to iterate over all the key, value pairs and add them to the a Map.
This is how should be your code:
String[][] array = { { "Dublin", "NYC"}, { "Moscow", "Los-Angeles"}, { "London", "Paris" }};
Map<String, String> map = new HashMap<String, String>();
//loop over the array and add elements into the HashMap
for(int i=0;i<array.length;i++){
map.put(array[i][0], array[i][1]);
}
This is a live working Demo.
The same with java Streams:
String[][] array = { { "Dublin", "NYC"}, { "Moscow", "Los-Angeles"}, { "London", "Paris" }};
Map<String, String> flightsMap = Stream.of(array)
.collect(Collectors.toMap(p -> p[0], p -> p[1]));
