编写一个类实现银行账户Account的概念，包含的属性有“帐号”、“密码”、“存款余额”、“利率rate”、“最小余额”，定义封装这些属性的方法。账号要自动生成。编写主类，使用银行账户类，输入、输出3个储户的上述信息。考虑：哪些属性可以设计成static属性。

Account.java

public class Account {
	private int account_number;//账号
	private int password;//密码
	private double deposit_balance;//存款余额
	private double interest_rate;//利率
	private double min_balance;//最小余额
	static int final_number=2019001;
	{
		account_number = final_number;
		System.out.printf("账号为:%d\n", account_number);
		final_number++;
	}
	
	public int getAccount_number() {
		return account_number;
	}

	public void setAccount_number(int account_number) {
		this.account_number = account_number;
	}

	public int getPassword() {
		return password;
	}

	public void setPassword(int password) {
		this.password = password;
	}

	public double getDeposit_balance() {
		return deposit_balance;
	}

	public void setDeposit_balance(double deposit_balance) {
		this.deposit_balance = deposit_balance;
	}

	public double getInterest_rate() {
		return interest_rate;
	}

	public void setInterest_rate(double interest_rate) {
		this.interest_rate = interest_rate;
	}

	public double getMin_balance() {
		return min_balance;
	}

	public void setMin_balance(double min_balance) {
		this.min_balance = min_balance;
	}

	@Override
	public String toString() {
		return "Account [账号" + account_number + ", 密码" + password + ", 存款余额"
				+ deposit_balance + ", 利率" + interest_rate + ", 最小余额" + min_balance + "]";
	}

}

MainClass.java

import java.util.Scanner;

public class MainClass {

	public static void main(String[] args) {
		// TODO Auto-generated method stub
		Scanner reader = new Scanner(System.in);
		Account user1 = new Account();	
		Account user2 = new Account();
		Account user3 = new Account();
		System.out.println("设置密码：");
		user1.setPassword(reader.nextInt());
		user2.setPassword(reader.nextInt());
		user3.setPassword(reader.nextInt());
		System.out.println("输入存款：");
		user1.setDeposit_balance(reader.nextDouble());
		user2.setDeposit_balance(reader.nextDouble());
		user3.setDeposit_balance(reader.nextDouble());
		System.out.println("输入利率：");
		user1.setInterest_rate(reader.nextDouble());
		user2.setInterest_rate(reader.nextDouble());
		user3.setInterest_rate(reader.nextDouble());
		System.out.println("输入最小余额：");
		user1.setMin_balance(reader.nextDouble());
		user2.setMin_balance(reader.nextDouble());
		user3.setMin_balance(reader.nextDouble());
		System.out.println(user1.toString()+'\n'+user2.toString()+'\n'+user3.toString());
	}

}

运行结果：

没得考虑，直接另外设置一个整数变量为static int 类型，在把值赋值给限制变量。