Person.java

public class Person {
    private int pid;
    private String name;

    public Person(int pid, String name) {
        this.pid = pid;
        this.name = name;
    }
    
    @Override
    public boolean equals(Object obj){
        if (obj == null || !(obj instanceof Person)) return false;
        if (obj == this) return true;
        Person p = (Person) obj;
        return p.getName().equals(this.name);
    }

    public String getName() {
        return name;
    }
    
    @Override
    public int hashCode(){
        return this.pid;
    }

}

Added override annotation