Incompatible return type error java

Question

class BankAccount {
    private String firstname;
    private String lastname;
    private int ssn;
    private int accountnumber = 0;
    private double accountbala         


        

Answer 1

public void setAccountNumber(int accountnumber) {
    return accountnumber;
}

public void deposit(double amount) {
    return this.accountbalance=this.accountbalance+amount;
}

...Are you trying to return in void-return function???

This will be correct:

public int setAccountNumber(int accountnumber) {
//     ^^^
    return accountnumber;
}

public double deposit(double amount) {
//     ^^^^^^
    return this.accountbalance=this.accountbalance+amount;
}