1.2定义类

自助售货机

定义一个类VendingMachine

这个类具有 price balance total属性
showPrompt insertMoney getFood 动作

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新建一个Java Project 命名为VendingMachine,在这个project里面新建一个class（勾选 public ststic void main(String[] args)

package vendingmachine;

public class VendingMachine {
	int price=80;
	int balance;
	int total;
	
	void showPrompt()
	{
		System.out.println("Welcome");
	}
	
	void insertMomey(int amount)
	{
		balance =  balance + amount;
	}
	
	void showBalance()
	{
		System.out.println(balance);
	}
	
	void getFood()
	{
		if(balance>=price)
		{
			System.out.println("Here you are");
			balance = balance - price;
			total = total + price;
		}
	}

	public static void main(String[] args) {
		// TODO Auto-generated method stub
		VendingMachine vm = new VendingMachine();//制造对象
		//制造出来的对象可以类的动作
		vm.showPrompt();
		vm.showBalance();
		vm.insertMomey(100);
		vm.getFood();
		vm.showBalance();
	}

}

可以再定义一个对象

package vendingmachine;

public class VendingMachine {
	int price=80;
	int balance;
	int total;
	
	void showPrompt()
	{
		System.out.println("Welcome");
	}
	
	void insertMomey(int amount)
	{
		balance =  balance + amount;
	}
	
	void showBalance()
	{
		System.out.println(balance);
	}
	
	void getFood()
	{
		if(balance>=price)
		{
			System.out.println("Here you are");
			balance = balance - price;
			total = total + price;
		}
	}

	public static void main(String[] args) {
		// TODO Auto-generated method stub
		VendingMachine vm = new VendingMachine();//制造对象
		//制造出来的对象可以类的动作
		vm.showPrompt();
		vm.showBalance();
		vm.insertMomey(100);
		vm.getFood();
		vm.showBalance();
		//*****************
		VendingMachine vm1 = new VendingMachine();
		vm1.insertMomey(200);
		vm1.showBalance();
		//*****************
	}

}