Can someone please explain to me why in withdraw() it needs to add a return, but in deposit() it doesnt need it?

public class SavingsAccount {
  
  int balance;
  
  public SavingsAccount(int initialBalance){
    balance = initialBalance;
  }
  
  public void checkBalance(){
    System.out.println("Hello!");
    System.out.println("Your balance is "   balance);

  }

  public void deposit(int amountToDeposit){
    balance = balance   amountToDeposit;
    System.out.println("You just deposited "   amountToDeposit); 

  }

  public int withdraw(int amountToWithdraw){
    balance = balance - amountToWithdraw;
    System.out.println("You just withdrew "   amountToWithdraw);
    return amountToWithdraw;

  }

  public static void main(String[] args){
    SavingsAccount savings = new SavingsAccount(2000);
    

    //Withdrawing:
    savings.withdraw(150);
    
    //Deposit:
    savings.deposit(25);
    
    //Check balance:
    savings.checkBalance();
    
  }       
}

CodePudding user response：

That is because in the definition of your withdraw() method, it is stated that it should return an int. In the deposit() method you use void as a return type. When using void, no return is needed. (But you could still also just use an empty return; at the end of the method if you want to)

CodePudding user response：

The return keyword means "give this value back to the caller".

withdraw() gives the caller back an int, deposit() gives the caller back nothing. Since deposit() doesn't give any info back to the caller, it doesn't return anything. You can see this in the function signature - deposit() has return type void, while withdraw() has return type int