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So that if have to break for if there are same values as you can see in first one it's all ok but in another ones it just failed I don't know why.

[-100.0, -100.0]; [-100.0, -100.0]
0; 5
true
...

Try to add this
System.out.println(vertices[0] +"; "+ pol.getVertex(i)); before
if (vertices[0].equals(pol.getVertex(i) ) ) break; and you will see it have to break that shitty for but it doesn't...

Sorry for duplicate I don't know how to delete it.

yes I am sure and like I said values of 4 digits: 0 5 5 5 have to be numbers of variable in array with match but it doesn't.

--- Update ---

It's just little bit different. First number have to...

it's value of int i but like I said output have to be 0 3 1 1 or 1 4 2 2 not 0 5 5 5 and there is no case when match is not found so I think it's not necessary to fix.

Edit: so value of i have to...

basically I am comparing two instances of class Vertex 2D.


int i = 0;

for (; i < vertices.length; i++) {

if (vertices[0].equals(pol.getVertex(i) ) ) break;
}

public abstract class SimplePolygon {

public abstract Vertex2D getVertex(int index) throws IllegalArgumentException;
public abstract int getNumVertices();

public double getArea() {

...