account.java

电子银行系统

package model;

import Exception.*;
import java.io.*;

public abstract class Account implements Serializable, Cloneable {

	private long id;

	private String password;

	private String name;

	private String personId;

	private String email;

	private double balance;

	public Account() {
	}

	public Account(String password, String name, String personId, String email) {
		this();
		this.id = getNextId();

		this.password = password;
		this.name = name;
		this.personId = personId;
		this.email = email;
	}

	private static synchronized long getNextId() {
		/*
		 * 从文件里读取一个id值
		 */
		DataInputStream in = null;
		long sid = 10000;
		try {
			// FileInputStream fin=new
			// FileInputStream("/home/soft01/workspace/mybam/Data/id.txt");
			FileInputStream fin = new FileInputStream(
					"D:\\sh_workspace\\Bank\\Data\\id.txt");
			in = new DataInputStream(fin);
			sid = in.readLong();
		} catch (FileNotFoundException e) {
		} catch (IOException e) {
		} finally {
			try {
				if (in != null)
					in.close();
			} catch (IOException e) {
			}
		}
		sid++;
		/*
		 * 把新的id值写回文件
		 */
		DataOutputStream out = null;
		try {
			// FileOutputStream fou=new
			// FileOutputStream("/home/soft01/workspace/mybam/Data/id.txt");
			FileOutputStream fou = new FileOutputStream(
					"D:\\sh_workspace\\Bank\\Data\\id.txt");
			out = new DataOutputStream(fou);
			out.writeLong(sid);
		} catch (FileNotFoundException e) {
		} catch (IOException e) {
		} finally {
			try {
				if (out != null)
					out.close();
			} catch (IOException e) {
			}
		}
		return sid;
	}

	public long getId() {
		return id;
	}

	public double getBalance() {
		return balance;
	}

	public void setBalance(double balance) {
		this.balance = balance;
	}

	public String getEmail() {
		return email;
	}

	public String getName() {
		return name;
	}

	public String getPassword() {
		return password;
	}

	public String getPersonId() {
		return personId;
	}

	/*
	 * 为什么存款方法deposit()提供实现,而把取款方法withdraw()设计成抽象方法?
	 */
	public final synchronized void deposit(double money) {
		this.balance = this.balance + money;
	}

	public abstract void withdraw(double money)
			throws BusinessException.BalanceNotEnoughException;

	public String toString() {
		return this.getName() + "\t" + this.getPersonId() + "\t"
				+ this.getEmail();
	}

	/*
	 * 
	 * @see java.lang.Object#equals(java.lang.Object)
	 */
	@Override
	public boolean equals(Object o) {
		if (this == o)
			return true;
		if (o == null)
			return false;
		if (this.getClass() != o.getClass())
			return false;
		Account c = (Account) o;
		boolean flag = true;
		if (!(this.password.equals(c.password)))
			flag = false;
		else if (!(this.name.equals(c.name)))
			flag = false;
		else if (!(this.personId.equals(c.personId)))
			flag = false;
		else if (!(this.email.equals(c.email)))
			flag = false;
		else if (this.getBalance() != c.getBalance())
			flag = false;
		return flag;
	}
	
	@Override
	public Object clone() {
		try {
			return super.clone();
		} catch (CloneNotSupportedException e) {
			e.printStackTrace();
			return null;
		}
	}

	@Override
	public int hashCode() {
		
		return new Long(id).hashCode()^password.hashCode()^name.hashCode()
		       ^personId.hashCode()^email.hashCode()^new Double(balance).hashCode();
	}
	
}