Equals and Hashcode

[jammy ponkia]

public class hashtest1 {
public static void main(String[] args) {
Foo f1= new Foo();
Foo f2=f1;
Foo f3= new Foo();
}
}

Assuming that Foo has correctly implemented hashCode and equals methods, which of the following will always print out "true" ?

Options:

if(f1.equals(f2)) System.out.println("true");
if(f1.hashCode() == f2.hashCode()) System.out.println("true");
if(f1.hashCode() != f3.hashCode()) System.out.println("true");
if(f1 == f2) System.out.println("true");

Can someone explain me the answer for this question?

Thanks,
Jaimesh

[Ben Souther]

jammy ponkia,

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