java - HashMap not matching the value -

i have hashmap of buttons corresponding points in matrix. example in 3x3 matrix, btn0 @ (0,0) , on. point class 2 int variables coordinates. hashmap below:

public final static hashmap<button, point> buttonpoint = new hashmap<button, point>(); buttonpoint.put(btn0, new point(0,0)); buttonpoint.put(btn1, new point(0,1)); buttonpoint.put(btn2, new point(0,2)); buttonpoint.put(btn3, new point(1,0)); ... 

i perform few calculations , come point (1,0). want button coordinates. following:

button selectedbutton = null;     for(java.util.map.entry<button, point> entry : buttonpoint.entryset()){     if(objects.equals(selectedpoint, entry.getvalue())){         selectedbutton=entry.getkey();     }     } 

but selectedbutton still null. debugged code , see values equal @ point in iteration, still if condition never becomes true. there missing hashmaps ? or there other way of doing ? link or direction towards solution helpful. in advance.

if want button coordinates, using map<button, point> not solution. should use map<point, button> instead. way, need button @ given point is

button b = map.get(point); 

and operation operates in constant time.

in both cases, need override equals() , hashcode() in point. otherwise point never equal other point.

@override public boolean equals(object o) {     if (o == null) {         return false;     }     if (o == this) {         return true;     }     if (o.getclass() != point.class) {         return false;     }     point other = (point) o;     return other.x == this.x && other.y == this.y; }  @override public int hashcode() {     return objects.hash(x, y); }