package com.cx.bank.manager; import com.cx.bank.model.MoneyBean; public class ManagerImpl { MoneyBean moneyBean = new MoneyBean(); public double inquiry(){ double money = moneyBean.getMoney(); return money; } public boolean withdrawals(double money){ if(money <= 0 ){ System.out.println("对不起，您的取款金额需大于0元！"); return false; } double leave = moneyBean.getMoney(); if(money > leave){ System.out.println("对不起，您的存款金额不够！"); return false; } moneyBean.setMoney(leave - money); System.out.println("取款成功！"); return true; } public boolean deposit(double money){ if(money <=0 ){ System.out.println("对不起，您的存款金额需大于0元！"); return false; } double leave = moneyBean.getMoney(); moneyBean.setMoney(leave + money); System.out.println("存款成功！"); return true; } public void exitSystem(){ System.out.println("系统已经退出"); System.exit(1); } }用单例模式实现ManagerImpl对象的创建。

好的，下面是使用单例模式实现ManagerImpl对象的创建的代码示例：

package com.cx.bank.manager;

import com.cx.bank.model.MoneyBean;

public class ManagerImpl {
    private static ManagerImpl instance = null; // 单例模式实例

    private MoneyBean moneyBean = new MoneyBean();

    private ManagerImpl() {} // 私有构造函数

    public static ManagerImpl getInstance() {
        if (instance == null) {
            instance = new ManagerImpl();
        }
        return instance;
    }

    public double inquiry() {
        double money = moneyBean.getMoney();
        return money;
    }

    public boolean withdrawals(double money) {
        if (money <= 0) {
            System.out.println("对不起，您的取款金额需大于0元！");
            return false;
        }
        double leave = moneyBean.getMoney();
        if (money > leave) {
            System.out.println("对不起，您的存款金额不够！");
            return false;
        }
        moneyBean.setMoney(leave - money);
        System.out.println("取款成功！");
        return true;
    }

    public boolean deposit(double money) {
        if (money <= 0) {
            System.out.println("对不起，您的存款金额需大于0元！");
            return false;
        }
        double leave = moneyBean.getMoney();
        moneyBean.setMoney(leave + money);
        System.out.println("存款成功！");
        return true;
    }

    public void exitSystem() {
        System.out.println("系统已经退出");
        System.exit(1);
    }
}

这里的关键在于将构造函数设为私有，这样外部就无法通过new来创建ManagerImpl对象，而是通过静态方法getInstance()来获取单例模式实例。当instance为null时，创建一个新的ManagerImpl对象；当instance不为null时，直接返回该对象。这样就保证了ManagerImpl类只有一个实例对象。