Java ArrayList Contain always return false although it contain the same value

Question

This is my Hole Class

class Hole {

public  int a;
public  int b;

Hole(int a, int b) {
    this.a = a;
    this.b = b;
}

So i adding a

Answer 1

You should overide the equals method of the Hole class:

@Override
public boolean equals(Object obj) {

if (obj == this) {
    return true;
}

if (!(obj instanceof Hole)) {
    return false;
}

Hole other = (Hole) obj;

return a == other.a && b == other.b;
}