How to use vectors/arrays in Java?

Question

Hello, I am very layy in Java and need to use a variable storing several others. How can I do this? I have the following:

LatLng ponto1 = new LatLng(-19.924312,-43.931762);
LatLng ponto2 = new LatLng(-18.851388,-41.946910);

I’m used to C, where I could do something like:

LatLng pontos[2];
LatLng pontos[1] = new LatLng(-19.924312,-43.931762);
LatLng pontos[2] = new LatLng(-18.851388,-41.946910);

But when I try this in Android Studio, it returns me syntax errors... How would be the right way to do?

Note: I need to do this to compare several "points" within a "for", I think this is the best way...

--- EDIT ---

It returns me type errors:

• Unkown class: points
• Missing method body, or declare Abstract

--EDIT2-- (code, as Maniero requested)

public class Mapa extends FragmentActivity implements OnMapReadyCallback {

private GoogleMap mMap;

@Override
protected void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.activity_mapa);
    // Obtain the SupportMapFragment and get notified when the map is ready to be used.
    SupportMapFragment mapFragment = (SupportMapFragment) getSupportFragmentManager()
            .findFragmentById(R.id.map);
    mapFragment.getMapAsync(this);
}

LatLng ponto1 = new LatLng(-19.924312,-43.931762);
LatLng ponto2 = new LatLng(-18.851388,-41.946910);

@Override
public void onMapReady(GoogleMap googleMap) {
mMap = googleMap;

if (ActivityCompat.checkSelfPermission(Mapa.this,     android.Manifest.permission.ACCESS_FINE_LOCATION) != PackageManager.PERMISSION_GRANTED && ActivityCompat.checkSelfPermission(Mapa.this, android.Manifest.permission.ACCESS_COARSE_LOCATION) != PackageManager.PERMISSION_GRANTED) {
        ActivityCompat.requestPermissions(Mapa.this,new String[]{android.Manifest.permission.ACCESS_FINE_LOCATION}, 1);
    }else{
        if(!mMap.isMyLocationEnabled())
            mMap.setMyLocationEnabled(true);

        LocationManager lm = (LocationManager)getSystemService(Context.LOCATION_SERVICE);
        Location myLocation = lm.getLastKnownLocation(LocationManager.GPS_PROVIDER);

        if (myLocation == null) {
            Criteria criteria = new Criteria();
            criteria.setAccuracy(Criteria.ACCURACY_COARSE);
            String provider = lm.getBestProvider(criteria, true);
            myLocation = lm.getLastKnownLocation(provider);
        }

        if(myLocation!=null){
            LatLng userLocation = new LatLng(myLocation.getLatitude(), myLocation.getLongitude());
            mMap.animateCamera(CameraUpdateFactory.newLatLngZoom(userLocation, 14), 1500, null);
            double distancia = SphericalUtil.computeDistanceBetween(ponto1, userLocation);
            double valorLatitude = myLocation.getLatitude();
            double valorLongitude = myLocation.getLongitude();

            /*String stringLongitude = Double.toString(valorLongitude);
            String stringLatitude = Double.toString(valorLatitude);*/
            String stringDistancia = Double.toString(distancia);

            TextView textLatitude = (TextView) findViewById(R.id.textLatitude);
            textLatitude.setText(stringDistancia);
            /*TextView textLongitude = (TextView) findViewById(R.id.textLongitude);
            textLongitude.setText(stringLongitude);*/
        }
    }
}

I am using the 'Sphericalutil.computeDistanceBetween' function to calculate the distance from point 1 with the user’s position. This works normally, so... Now I needed a 'for' to calculate the distance of each point I list above in relation to the user’s position and then return me to the shortest distance... For this, I think I would need to put all the dots in a single array and test element by array element, but I don’t know how to declare the array up there...

Answer 1

In java, learn that the base language is this, only the base, one of the great strengths of Java is its built-in libraries that do 1001 things, and it comes all pre-made in JDK.

An Array, the way you’re used to C would be:

Object[] array = new Object[10];

this creates an empty array of the type Object 10-point, empty ball. But in newer versions of java we have the 'shortcut':

String[] array = {"um elemento", "outro elemento"}

That initializes an array with size 2 and already with the two elements inside, the pattern can apply to any other type of variable. Numbers, objects:

{new LatLang(10.22, -2.44),new LatLang(1.22, -4.66)}  

etc... But in java 8 is much more common the more "modern" version of java sets Lists, Maps, Sets, ETC

The equivalent of arrays in our library of sets would be ArrayList, the difference is that sets are objects, have dynamic size and support various built-in operations: sort, take specific item, search, etc. They are part of the JDK and you can use:

ArrayList<Object> lista = new ArrayList(); 
// E para adicionar items:
lista.add(new Object());
// Voce pode ate especificar o indice
lista.add(3, new Object());
// Mas cuidado, as listas se por mais que listas se expandam sozinhas para 
// acomodar novos indices elas tem índice. o padrão inicial é 10
// voce nao pode acabar de criar uma lista e:
lista.add(10000, new Object());

Answer 2

Create a list:

List<LatLng> pontos = new ArrayList<LatLng>();
pontos.add(new LatLng(-19.924312,-43.931762));
pontos.add(new LatLng(-18.851388,-41.946910));

Then recover by pontos.get(0), for example.