Java address book. How to prevent duplicate contacts in my code?

Question

switch(menuChoice) {

case 1: 
    System.out.println(\"Enter your contact\'s first name:\\n\");
    String fname = scnr.next();
    System.out.println(\"Enter your cont         


        

Answer 1

You should Override equals inside your Person class

public boolean equals(Object obj) {
    if(fName.equals(obj.getfName()) && lName.equals(obj.getlName)) {
        return true;
    }
    return false;
}

Then just call:

if(!(person1.equals(person2))) {
//not a duplicate
}

And of course substitute the variables/objects with whatever objects you want. You also should add getters and setters for last and first name. Hope this helps!