override equals method to compare more than one field in java

Question

What is the best way to override equals method in java to compare more than one field? For example, I have 4 objects in the class, o1, o2, o3, o4 and I want compare all of t

Answer 1

Use Guava:

@Override
public boolean equals(final Object obj){
    if (!(obj instanceof Foo)) {
        return false;
    }
    final Foo other = (Foo) obj;
    return Objects.equal(o1, other.o1)
        && Objects.equal(o2, other.o2)
        && Objects.equal(o3, other.o3)
        && Objects.equal(o4, other.o4);
}

You get hashCode() for cheap, too:

@Override
public int hashCode() {
    return Objects.hashCode(o1, o2, o3, o4);
}