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

A void method cannot return someting. And a method which have a return type must return the type specified in method signature.

Error 1

For example look this method

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

Yo cannot return from a void method.

That should be

  public void setAccountNumber(int accountnumber) {
           this.accountnumber =accountnumber;
       }

Same goes for remaining methods too.

Error 2

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

that return statement is syntactically wrong. You cannot return as it is void. That should be

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