Java作业 - c++代码转Java代码 个人银行账户管理程序c++源码

4_9：

c++代码：

//4_9.cpp
#include 
#include 
using namespace std;

class SavingsAccount { //储蓄账户类
private:
	int id;				//账号
	double balance;		//余额
	double rate;		//存款的年利率
	int lastDate;		//上次变更余额的时期
	double accumulation;	//余额按日累加之和

	//记录一笔帐，date为日期，amount为金额，desc为说明
	void record(int date, double amount);
	//获得到指定日期为止的存款金额按日累积值
	double accumulate(int date) const {
		return accumulation + balance * (date - lastDate);
	}
public:
	//构造函数
	SavingsAccount(int date, int id, double rate);
	int getId() { return id; }
	double getBalance() { return balance; }
	double getRate() { return rate; }

	//存入现金
	void deposit(int date, double amount);
	//取出现金
	void withdraw(int date, double amount);
	//结算利息，每年1月1日调用一次该函数
	void settle(int date);
	//显示账户信息
	void show();
};

//SavingsAccount类相关成员函数的实现
SavingsAccount::SavingsAccount(int date, int id, double rate)
	: id(id), balance(0), rate(rate), lastDate(date), accumulation(0) {
	cout << date << "\t#" << id << " is created" << endl;
}

void SavingsAccount::record(int date, double amount) {
	accumulation = accumulate(date);
	lastDate = date;
	amount = floor(amount * 100 + 0.5) / 100;	//保留小数点后两位
	balance += amount;
	cout << date << "\t#" << id << "\t" << amount << "\t" << balance << endl;
}

void SavingsAccount::deposit(int date, double amount) {
	record(date, amount);
}

void SavingsAccount::withdraw(int date, double amount) {
	if (amount > getBalance())
		cout << "Error: not enough money" << endl;
	else
		record(date, -amount);
}

void SavingsAccount::settle(int date) {
	double interest = accumulate(date) * rate / 365;	//计算年息
	if (interest != 0)
		record(date, interest);
	accumulation = 0;
}

void SavingsAccount::show() {
	cout << "#" << id << "\tBalance: " << balance;
}

int main() {
	//建立几个账户
	SavingsAccount sa0(1, 21325302, 0.015);
	SavingsAccount sa1(1, 58320212, 0.015);

	//几笔账目
	sa0.deposit(5, 5000);
	sa1.deposit(25, 10000);
	sa0.deposit(45, 5500);
	sa1.withdraw(60, 4000);

	//开户后第90天到了银行的计息日，结算所有账户的年息
	sa0.settle(90);
	sa1.settle(90);

	//输出各个账户信息
	sa0.show();	cout << endl;
	sa1.show();	cout << endl;
	return 0;
}

转Java：

class SavingsAccount{
	private int id,lastDate;
	private double balance,rate,accumulation;
	private void record(int date,double amount) {
		accumulation = accumulate(date);
		lastDate = date;
		amount = Math.floor(amount * 100 + 0.5) / 100;	//保留小数点后两位
		balance += amount;
		System.out.println(date+"\t#"+id+"\t"+amount+"\t"+balance);
	}
	private double accumulate(int date) {
		return accumulation + balance * (date - lastDate);
	}
	public SavingsAccount(int _date,int _id,double _rate) {
		id=_id;
		lastDate=_date;
		balance=0;
		rate=_rate;
		accumulation=0;
		System.out.println(""+_date+"\t#"+_id+" is created");
	}
	public int getId() {return id;}
	public double getBalance() {return balance;}
	public double getRate() {return rate;}
	public void deposit(int date,double amount) {
		record(date,amount);
	}
	public void withdraw(int date,double amount) {
		if(amount>getBalance())
			System.out.println("Error: not enough money");
		else 
			record(date,-amount);
	}
	public void settle(int date) {
		double interest=accumulate(date)*rate/365;
		if(interest!=0)
			record(date,interest);
		accumulation=0;
	}
	public void show() {
		System.out.print("#"+id+"\tBalance: "+balance);
	}
} 
public class Main4_9{
	public static void main(String MAINs[]) {
		SavingsAccount sa0=new SavingsAccount(1,21325302,0.015);
		SavingsAccount sa1=new SavingsAccount(1,58320201,0.015);
		
		sa0.deposit(5,5000);
		sa1.deposit(25, 10000);
		sa0.deposit(45,5500);
		sa1.withdraw(60,4000);
		
		sa0.settle(90);
		sa1.settle(90);
		
		sa0.show();
		System.out.println();
		sa1.show();
		System.out.println();
	}
}

9_16:

Java代码：

//Data.java

public class Date {
	private int year,month,day,totalDays;
	static private final int[] DAYS_BEFORE_MONTH= { 0, 31, 59, 90, 120, 151, 181, 212, 243, 273, 304, 334, 365 };
	public Date(int year,int month, int day) {
		if (day <= 0 || day > getMaxDay()) {
			System.out.print("Invalid date: ");
			show();
			System.out.println("");
			System.exit(1);
		}
		int years = year - 1;
		totalDays = years * 365 + years / 4 - years / 100 + years / 400
			+ DAYS_BEFORE_MONTH[month - 1] + day;
		if (isLeapYear() && month > 2) totalDays++;
	}
	public int getYear(){return year;}
	public int getMonth(){ return month; }
	public int getDay() { return day; }
	public int getMaxDay() {//获得当月有多少天
		if (isLeapYear() && month == 2)
			return 29;
		else
			return DAYS_BEFORE_MONTH[month]- DAYS_BEFORE_MONTH[month - 1];
	}
	public boolean isLeapYear(){	//判断当年是否为闰年
		return year % 4 == 0 && year % 100 != 0 || year % 400 == 0;
	}
	public void show() {
		System.out.print(""+getYear()+"-"+getMonth()+"-"+getDay());
	};			//输出当前日期
	//计算两个日期之间差多少天	
	public int sub (final Date date) {
		return totalDays - date.totalDays;
	}
};

//account.java

public abstract class account{
    private String id;
    private double balance;
    static private double total=0;
    public account() {}
    protected account(final Date date,final String id){
    	this.id=id;
    	this.balance=0;
    	date.show();
    	System.out.println("\t#"+id+" created");
    }
    protected void record(final Date date,double amount,final String desc){
    	amount = Math.floor(amount * 100 + 0.5) / 100;	//保留小数点后两位
    	balance += amount;
    	total += amount;
    	date.show();
    	System.out.println("\t#"+id+"\t"+amount+"\t"+balance+"\t"+desc);
    }
    protected final void error(final String msg){
    	System.out.println("Error(#"+id+"): "+msg);
    }
    public String getId(){ return id; }
    public double getBalance() { return balance; }
	static public double getTotal() { return total; }
	//存入现金，date为日期，amount为金额，desc为款项说明
	abstract public void deposit(final Date date, double amount, final String desc);
	//取出现金，date为日期，amount为金额，desc为款项说明
	abstract public void withdraw(final Date date, double amount, final String desc);
	//结算（计算利息、年费等），每月结算一次，date为结算日期
	abstract public void settle(final Date date) ;
	//显示账户信息
	public void show() {
		System.out.print(id+"\tBalance: "+balance);
	};
};

class SavingsAccount extends account { //储蓄账户类
	private accumulator acc;	//辅助计算利息的累加器
	private double rate;		//存款的年利率
	//构造函数
	public SavingsAccount(final Date date, final String id, double rate) {
		super(date,id);
		this.rate=rate;
		this.acc=new accumulator(date,0);
	};
	public double getRate(){ return rate; }
	public void deposit(final Date date, double amount, final String desc) {
		record(date, amount, desc);
		acc.change(date, getBalance());
	};
	public void withdraw(final Date date, double amount, final String desc) {
		if (amount > getBalance()) {
			error("not enough money");
		} else {
			record(date, -amount, desc);
			acc.change(date, getBalance());
		}
	};
	public void settle(final Date date) {
		if (date.getMonth() == 1) {	//每年的一月计算一次利息
			double interest = acc.getSum(date) * rate
				/ (date.sub(new Date(date.getYear()-1, 1, 1)));
			if (interest != 0)
				record(date, interest, "interest");
			acc.reset(date, getBalance());
		}
	};
};

class CreditAccount extends account { //信用账户类
	private accumulator acc;	//辅助计算利息的累加器
	private double credit;		//信用额度
	private double rate;		//欠款的日利率
	private double fee;			//信用卡年费
	private double getDebt() {	//获得欠款额
		double balance = getBalance();
		return (balance < 0 ? balance : 0);
	}
	//构造函数
	public CreditAccount(final Date date, final String id, double credit, double rate, double fee) {
		super(date,id);
		this.credit=credit;
		this.rate=rate;
		this.fee=fee;
		this.acc=new accumulator(date,0);
	};
	public double getCredit() { return credit; }
	public double getRate() { return rate; }
	public double getFee() { return fee; }
	public double getAvailableCredit() {	//获得可用信用
		if (getBalance() < 0) 
			return credit + getBalance();
		else
			return credit;
	}
	public void deposit(final Date date, double amount, final String desc) {
		record(date, amount, desc);
		acc.change(date, getDebt());
	};
	public void withdraw(final Date date, double amount, final String desc) {
		if (amount - getBalance() > credit) {
			error("not enough credit");
		} else {
			record(date, -amount, desc);
			acc.change(date, getDebt());
		}
	}
	public void settle(final Date date) {
		double interest = acc.getSum(date) * rate;
		if (interest != 0)
			record(date, interest, "interest");
		if (date.getMonth() == 1)
			record(date, -fee, "annual fee");
		acc.reset(date, getDebt());
	};
	public void show() {
		super.show();
		System.out.print("\t+Available credit:"+getAvailableCredit());
	};
};

//accumulator.java

public class accumulator {	//将某个数值按日累加
	private Date lastDate;	//上次变更数值的时期
	private double value;	//数值的当前值
	private double sum;		//数值按日累加之和
		//构造函数，date为开始累加的日期，value为初始值
	public accumulator(final Date date, double value){
		this.lastDate=date;
		this.value=value;
		this.sum=0;
	}
		//获得到日期date的累加结果
	public double getSum(final Date date) {
			return sum + value * (date.sub(lastDate));
	}
		//在date将数值变更为value
	public void change(final Date date, double value) {
			sum = getSum(date);
			lastDate = date;
			this.value = value;
	}
		//初始化，将日期变为date，数值变为value，累加器清零
	public void reset(final Date date, double value) {
			lastDate = date;
			this.value = value;
			sum = 0;
	}
};

//Main.java

import java.util.*;

public class Main {
	static public void main(String MAINs[]) {
		Scanner cin=new Scanner(System.in);
		Date date =new Date(2008, 11, 1);	//起始日期
		ArrayList accounts=new ArrayList(0);	//创建账户数组，元素个数为0
		System.out.println("(a)add account (d)deposit (w)withdraw (s)show (c)change day (n)next month (e)exit");
		//cout << "(a)add account (d)deposit (w)withdraw (s)show (c)change day (n)next month (e)exit" << endl;
		String cmd;
		do {
			//显示日期和总金额
			date.show();
			//cout << "\tTotal: " << Account::getTotal() << "\tcommand> ";
			System.out.print("\tTotal: "+account.getTotal()+"\tcommand> ");
			String type;
			int index, day;
			double amount, credit, rate, fee;
			String id, desc;
			account _account;

			cmd=cin.next();
			switch (cmd) {
			case "a":	//增加账户
				type=cin.next();
				id=cin.next();
				//cin >> type >> id;
				if (type == "s") {
					rate=cin.nextDouble();
					//cin >> rate;
					_account = new SavingsAccount(date, id, rate);
				} else {
					credit=cin.nextDouble();
					rate=cin.nextDouble();
					fee=cin.nextDouble();
					//cin >> credit >> rate >> fee;
					_account = new CreditAccount(date, id, credit, rate, fee);
				}
				accounts.add(_account);
				//accounts.resize(accounts.Size() + 1);
				//accounts[accounts.getSize() - 1] = account;
				break;
			case "d":	//存入现金
				index=cin.nextInt();
				amount=cin.nextDouble();
				desc=cin.nextLine();
				accounts.get(index).deposit(date,amount,desc);
				//cin >> index >> amount;
				//getline(cin, desc);
				//accounts[index]->deposit(date, amount, desc);
				break;
			case "w":	//取出现金
				index = cin.nextInt();
                amount = cin.nextDouble();
                desc = cin.nextLine();
                accounts.get(index).withdraw(date, amount, desc);
//				cin >> index >> amount;
//				getline(cin, desc);
//				accounts[index]->withdraw(date, amount, desc);
				break;
			case "s":	//查询各账户信息
				for (int i = 0; i < accounts.size(); i++) {
                    System.out.printf("[%d]", i);
                    accounts.get(i).show();
                    System.out.println("");
                }
//				for (int i = 0; i < accounts.getSize(); i++) {
//					cout << "[" << i << "] ";
//					accounts[i]->show();
//					cout << endl;
//				}
				break;
			case "c":	//改变日期
				 day = cin.nextInt();
                 Date localDay = new Date(date.getYear(), date.getMonth(), day);
                 if (daydate.getMaxDay()){
                	 System.out.print("Invalid day");
                 }else {
                     date = localDay;
                 }
//				cin >> day;
//				if (day < date.getDay())
//					cout << "You cannot specify a previous day";
//				else if (day > date.getMaxDay())
//					cout << "Invalid day";
//				else
//					date = Date(date.getYear(), date.getMonth(), day);
				break;
			case "n":	//进入下个月
				if (date.getMonth() == 12) {
                    date = new Date(date.getYear(), 1, 1);
                } else {
                    date = new Date(date.getYear(), date.getMonth() + 1, 1);
                }
                for (int i = 0; i < accounts.size(); i++) {
                    accounts.get(i).settle(date);
                }
//				if (date.getMonth() == 12)
//					date = Date(date.getYear() + 1, 1, 1);
//				else
//					date = Date(date.getYear(), date.getMonth() + 1, 1);
//				for (int i = 0; i < accounts.getSize(); i++)
//					accounts[i]->settle(date);
				break;
			}
		} while (!cmd.equals("e"));
		cin.close();
	}
};