Help for a Beginner's Program

Question

Hello, I'm fairly new to the Java language. Recently I was writing a program revolving around the creation of classes and constructors...my code looks like this:
import java.util.Scanner;
class Money{
     private static int dollars, cents;
     Money(int dollars, int cents){
     Money(int dollars){
     Money(){
     static Money add(Money n,Money n2){
          return (n + n2);
     static Money minus(Money n,Money n2){
          return (n + n2);
     public static boolean equals(int m, int m2){
          if((m == dollars) && (m2 == cents));
               return true;
     public String toString(){
          return ("Dollars = "+ getDollars() + " " + "Cents =" + getCents());
     public static int getDollars(){
          return (dollars);
     public static int getCents(){
          return (cents);
     public static void setDollars(int n){
          dollars = n;
     public static void setCents(int n2){
          cents = n2;
class Program2_5{
     public static void main (String [] a) {
          Scanner kb= new Scanner (System.in);
          System.out.println ("Enter the amount of dollars");
          int d=kb.nextInt();
          System.out.println ("Enter the amount of cents");
          int c=kb.nextInt();
          Money.setDollars(d);
          Money.setCents(c);
          System.out.println (Money.toString());
The main part of my code is just to simply make sure the methods actually work. When i go to compile my code I get three errors revolving around three specific lines.
Error 1= {Operator + cannot be applied to Money, Money}
*static Money add(Money n,Money n2){*+
*     return (n n2);*+
Error 2= {Same as Error 1}
*static Money minus(Money n,Money n2){*+
*     return (n n2);*+
Error 3={non-static method toString() cannot be referenced from a static context}
*public String toString(){*+
*     return ("Dollars = " getDollars() + " " + "Cents =" + getCents());*+
In order to fix Error 3 i tried to place static in front of String toString() but got an error about the Money String toString() cannot override the Object StringtoString()
I have been working with this program for hours on and off and would really appreciate it if someone with more experience could help me...Thank You

Answer 1

I think there are a few things that could help you out. Firstly, amounts are generally not looked at as dollars and cents separately. You can always go back and change it, but I'd code it a bit more like this:
import java.util.Scanner;
public class Money {
  private double amount;
  public Money() {
    this(0.0);
  public Money(double amount) {
    setAmount(amount);
  public void setAmount(double amount) {
    this.amount = amount;
  public double getAmount() {
    return(amount);
  public void add(double amount) {
    setAmount(getAmount()+amount);
  public void minus(double amount) {
    setAmount(getAmount()-amount);
  public boolean equals(double amount) {
    if (getAmount() == amount)
      return true;
    return false;
  public String toString() {
    return ("Amount = "+getAmount());
  public static void main (String [] argv) {
    Scanner kb= new Scanner (System.in);
    System.out.println("Enter initial amount");
    double a=kb.nextDouble();
    Money money = new Money(a);
    System.out.println(money.toString());
    System.out.println("Enter amount to add");
    a=kb.nextDouble();
    money.add(a);
    System.out.println(money.toString());
    System.out.println("Enter amount to subtract");
    a=kb.nextDouble();
    money.minus(a);
    System.out.println(money.toString());
    System.out.println("Enter amount to compare");
    a=kb.nextDouble();
    System.out.println(money.equals(a));
}Hope it helps you out.