個人銀行口座管理システムc++回転Java(四-六)

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個人銀行管理システムバージョン0.1(4章記録対応)1)Javaにはc++のnamespaceはなく、packageに変更されています.2)private,publicなどはJavaでは個々のメンバーの前に書く必要がある.3)Javaでは一般関数(抽象クラス,インタフェースなどを除く)の宣言を関数体から分離することは許されず,一緒に書く.4)c++内void test(int_x)const{}の場合constはその関数がクラスのメンバーを変更できないことを指し,Java内final void 5)test(){}の場合finalはその関数が書き換えられないことを示す.Javaにはconstがありません.6)Javaの出力は文がSystem.out.println(変数名+「文字列」)である.「<7)Javaにはmath.hなどのヘッダファイルを書く必要はありません.クラスライブラリにはあります.たとえば、Math.floor().8)c++でクラスを作成するオブジェクトは、直接クラス名オブジェクト名(パラメータ)で、Javaにはクラス名オブジェクト名=newクラス名(パラメータ)が必要です.

package PersonalBank1;
//4_9.cpp
public class SavingsAccount         //     
{
	  private int id;                 //  
	  private double balance;         //  
	  private double rate;            //      
	  private int lastDate;           //         
	  private double accumulation;    //        
	  //     ，date   ，amount   ，desc   
	  private void record(int date, double amount)
	  {
	  	accumulation = accumulate(date);
	      lastDate = date;
	      amount = Math.floor(amount * 100 + 0.5) / 100;  //        
	  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)
	  {
	      this.id = id;
	      this.balance = 0;
	      this.rate = rate;
	      this.lastDate = date;
	      this.accumulation = 0;
	      System.out.println(date+"\t#"+id+" is created");
	  }
	  public final int getId() { return id; }
	  public double getBalance() { return balance; }
	  public double getRate() { return rate; }
	  //    
	  public void deposit(int date, double amount)
	  {
		  if(amount < 0.0){
			  System.out.println("Deposit is error!");
			  record(date, 0);
		  }
		  else record(date, amount);
	  }
	
	  //    
	  public void withdraw(int date, double amount)
	  {
		  if(amount < 0.0){
			  System.out.println("Withdraw is error!");
			  record(date, 0);
		  }
		  else if (amount > getBalance())
	          System.out.println("Error: not enough money");
	      else
	          record(date, -amount);
	  }
	  //    ，  1 1        
	  public void settle(int date)
	  {
	      double interest = accumulate(date) * rate / 365;    //    
	      if (interest != 0)
	          record(date, interest);
	      accumulation = 0;
	  }
	  //      
	  public void show()
	  {
	      System.out.println("#"+id+"\tBalance: "+balance);
	  }
		public static void main(String[] args)
		{
			//      
	  SavingsAccount sa0 = new SavingsAccount(1,21325302,0.015);
	  //SavingsAccount sa1 = new SavingsAccount(1,58320212,0.015);
	  //    
	  sa0.deposit(5, -5000);
	 // sa1.deposit(25, 10000);
	  sa0.deposit(35, 5500);
	  sa0.withdraw(60, -3000);
	 // sa1.withdraw(60, 4000);
	  //    90         ，         
	  sa0.settle(90);

	  //sa1.settle(90);
	  //        
	  sa0.show(); //System.out.println();
	  //sa1.show(); System.out.println();
	}
}

個人銀行管理システムバージョン0.2(第5章記録対応)1)Javaにはconst修飾子がなく、類似のfinalがあるが、両者の機能に差がある.2)Javaにおけるコンストラクション関数にid(id)という表記はなく、this.id=idが多い.3)c++呼び出しクラスの静的メンバー関数はクラス名::関数名、Javaはクラス名.関数名.

package PersonalBank2;
//account.cpp
public class SavingsAccount {
	
	private int id;				//  
	private double balance;		//  
	private double rate;		//      
	private int lastDate;		//         
	private double accumulation;	//        
	private static double total = 0;	//        
	
		//     ，date   ，amount   ，desc   
	private void record(int date, double amount)
	{
		accumulation = accumulate(date);
		lastDate = date;
		amount = Math.floor((amount * 100 + 0.5)) / 100;	//        
		balance += amount;
		total += 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)
	{
		this.lastDate = date;
		this.id = id;
		this.rate = rate;
		this.accumulation = 0;
		this.balance = 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 static double getTotal() { return total; }

		//    
	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);
	}
		//    ，  1 1        
	public void settle(int date)
	{
		double interest = accumulate(date) * rate / 365;	//    
		if (interest != 0)
			record(date, interest);
		accumulation = 0;
	}
		//      
	public void show()
	{
		System.out.println("#" + id + "\tBalance: " + balance);
	}

}

package PersonalBank2;
//5_11.cpp
public class PersonalBank {

	public static void main(String[] args) {
		//      
		//SavingsAccount sa0 = new SavingsAccount(1, 21325302, 0.015);
		SavingsAccount sa1 = new SavingsAccount(1, 58320212, 0.015);

		//    
		//sa0.deposit(5, 5000);
		sa1.deposit(25, 3000);
		//sa0.deposit(45, 5500);
		sa1.withdraw(60, 4000);

		//    90         ，         
		//sa0.settle(90);
		sa1.settle(90);

		//        
		//sa0.show();
		sa1.show();
		System.out.println("Total: " + SavingsAccount.getTotal());
	}
}

個人銀行管理システムバージョン0.3(6章記録対応)1)Javaにはc++のような&シンボルリファレンスがなく、オブジェクトを作成する際にnewを使用する.2)Javaではグローバル変数は許されない.これはパッケージ性を損なうからである.3)Javaでの異常終了exit(1)はSystem.exit(1)を呼び出す必要がある.4)Javaの文字列タイプはクラスStringであり、printは改行を出力せず、printlnは改行する.

package PersonalBank3;
//date.cpp
public class Date {
	//        1       ，   getMaxDay     ，       
	final int DAYS_BEFORE_MONTH[] = { 0, 31, 59, 90, 120, 151, 181, 212, 243, 273, 304, 334, 365 };
	private int year;		// 
	private int month;		// 
	private int day;		// 
	private int totalDays;	//         1 1       

	boolean isLeapYear() {	//         
		return year % 4 == 0 && year % 100 != 0 || year % 400 == 0;
	}
	public Date(int year, int month, int day)	//  、 、     
	{
		this.day = day;
		this.month = month;
		this.year = year;
		if (day <= 0 || day > getMaxDay()) {
			System.out.println("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()		//        
	{
		if (isLeapYear() && month == 2)
			return 29;
		else
			return DAYS_BEFORE_MONTH[month]- DAYS_BEFORE_MONTH[month - 1];
	}
		
	public void show()			//      
	{
		System.out.print(getYear() + "-" + getMonth() + "-" + getDay());
	}
		//            	
	int distance(Date date)
	{
		return totalDays - date.totalDays;
	}

}

package PersonalBank3;
//account.cpp
public class SavingsAccount {

	private String id;		//  
	private double balance;		//  
	private double rate;		//      
	private Date lastDate;		//         
	private double accumulation;	//        
	private static double total = 0;	//        

		//     ，date   ，amount   ，desc   
	private void record(Date date, double amount, String desc)
	{
		accumulation = accumulate(date);
		lastDate = date;
		amount = Math.floor(amount * 100 + 0.5) / 100;	//        
		balance += amount;
		total += amount;
		date.show();
		System.out.println("\t#" + id + "\t" + amount + "\t" + balance + "\t" + desc);
	}
		//      
	private void error(String msg)
	{
		System.out.println("Error(#" + id + "): " + msg);
	}
		//                   
	private double accumulate(Date date)
	{
		return accumulation + balance * date.distance(lastDate);
	}
	 
		//    
	public SavingsAccount(Date date,String id, double rate)
	{
		this.id = id;
        this.balance = 0;
        this.rate = rate;
        this.lastDate = date;
        this.accumulation = 0;
		date.show();
		System.out.println( "\t#" + id + " created");
	}
	public String getId() { return id; }
	public double getBalance() { return balance; }
	public double getRate() { return rate; }
	public static double getTotal() { return total; }

		//    
	public void deposit(Date date, double amount, String desc)
	{
		record(date, amount, desc);
	}
		//    
	public void withdraw(Date date, double amount, String desc)
	 {
		if (amount > getBalance())
			error("not enough money");
		else
			record(date, -amount, desc);
	}
		//    ，  1 1        
	public void settle(Date date)//    
	{
		double interest = accumulate(date) * rate / date.distance(new Date(date.getYear() - 1, 1, 1));
		if (interest != 0)
			record(date, interest, "interest");
		accumulation = 0;
	}
		//      
	public void show()
	{
		System.out.println(id + "\tBalance: " + balance);
	}

}

package PersonalBank3;
//6_25.cpp
public class PersonalBank {

	public static void main(String[] args) {
		//Date date = new Date(2008, 11, 1);	//    
		/*
		//      
		SavingsAccount accounts[] = {
			new SavingsAccount(date, "S3755217", 0.015),
			new SavingsAccount(date, "02342342", 0.015)
		};
		int n = accounts.length; //    
		//11       
		accounts[0].deposit(new Date(2008, 11, 5), 5000, "salary");
		accounts[1].deposit(new Date(2008, 11, 25), 10000, "sell stock 0323");
		//12       
		accounts[0].deposit(new Date(2008, 12, 5), 5500, "salary");
		accounts[1].withdraw(new Date(2008, 12, 20), 20000, "buy a laptop");

		//               
		System.out.println();
		for (int i = 0; i < n; i++) {
			accounts[i].settle(new Date(2009, 1, 1));
			accounts[i].show();
			//System.out.println();
		}
		System.out.println("Total: " + SavingsAccount.getTotal());
		*/
		Date date1 = new Date(2008, 11, 50);
		//Date date2 = new Date(2009, 2, 1);
		date1.show();
		//System.out.println();
		//System.out.println(date1.getMaxDay());
		//System.out.println();
		//date2.show();
		//System.out.println();
		//System.out.println(date2.getMaxDay());
		//System.out.println();
		//System.out.println(date2.distance(date1));
	}

}

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