클래스의 정의와 인스턴스 생성, Java

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//'main' method must be in a class 'Rextester'.
//Compiler version 1.8.0_72

import java.util.*;
import java.lang.*;

class FruitSeller
{
	int numOfApple;
	int myMoney;
	final int APPLE_PRICE;
	
	public FruitSeller(int money, int appleNum, int price)
	{
		myMoney=money;
		numOfApple=appleNum;
		APPLE_PRICE=price;
	}
	
	public int saleApple(int money)
	{
		int num=money/APPLE_PRICE;
		numOfApple-=num;
		myMoney+=money;
		return num;
	}
	public void showSaleResult()
	{
		System.out.println("남은 사과: " + numOfApple);
		System.out.println("판매 수익: " + myMoney);
	}
}

class FruitBuyer
{
	int myMoney;
	int numOfApple;
	
	public FruitBuyer(int money)
	{
		myMoney=money;
		numOfApple=0;
	}
	
	public void buyApple(FruitSeller seller, int money)
	{
		numOfApple+=seller.saleApple(money);
		myMoney-=money;
	}
	public void showBuyResult()
	{
		System.out.println("현재 잔액: " + myMoney);
		System.out.println("사과 개수: " + numOfApple);		
	}
}

class Rextester
{
	public static void main(String[] args)
	{
		FruitSeller seller1 = new FruitSeller(0, 30, 1500);
		FruitSeller seller2 = new FruitSeller(0, 20, 1000);
		
		FruitBuyer buyer = new FruitBuyer(10000);
		buyer.buyApple(seller1, 4500);
		buyer.buyApple(seller2, 2000);
		
		System.out.println("과일 판매자1의 현재 상황");
		seller1.showSaleResult();
		
		System.out.println("과일 판매자2의 현재 상황");
		seller2.showSaleResult();
		
		System.out.println("과일 구매자의 현재 상황");
		buyer.showBuyResult();
	}
}

[ + ] Show input
Compilation time: 0.52 sec, absolute running time: 0.14 sec, cpu time: 0.06 sec, memory peak: 19 Mb, absolute service time: 0,66 sec