Question

求java程序：用线程实现多人对同一银行账号的存、取款业务 这是一个作业题！

Answer 1

package  demo.Threaddemo;

import java.math.BigDecimal;

public class person implements Runnable{

	private String name;
	
	
	private Accounts account;
	
	private  BigDecimal saveMoney;
	
	private  BigDecimal takeMoney;

	public String getName() {
		return name;
	}

	public void setName(String name) {
		this.name = name;
	}

	public Accounts getAccount() {
		return account;
	}

	public void setAccount(Accounts account) {
		this.account = account;
	}

	public BigDecimal getSaveMoney() {
		return saveMoney;
	}

	public void setSaveMoney(BigDecimal saveMoney) {
		this.saveMoney = saveMoney;
	}

	public BigDecimal getTakeMoney() {
		return takeMoney;
	}

	public void setTakeMoney(BigDecimal takeMoney) {
		this.takeMoney = takeMoney;
	}

	@Override
	public String toString() {
		return "person [account=" + account + ", name=" + name + ", saveMoney="
				+ saveMoney + ", takeMoney=" + takeMoney + ", getAccount()="
				+ getAccount() + ", getName()=" + getName()
				+ ", getSaveMoney()=" + getSaveMoney() + ", getTakeMoney()="
				+ getTakeMoney() + ", getClass()=" + getClass()
				+ ", hashCode()=" + hashCode() + ", toString()="
				+ super.toString() + "]";
	}

	public person(String name,Accounts accounts, BigDecimal saveMoney,
			BigDecimal takeMoney) {
		super();
		this.name = name;
		if(accounts==null){
			account = new Accounts();
			account.setToalMoney(BigDecimal.valueOf(0));
		 }else {
			 account= accounts;
		}
		this.saveMoney = saveMoney;
		this.takeMoney = takeMoney;
	}

	@Override
	public void run() {
		// TODO Auto-generated method stub
		System.out.println("正在进行存取操作......");
		if(null!=saveMoney&&!"".equals(saveMoney)){
			account.saveMoney(saveMoney);
		}
		if(null!=takeMoney&&!"".equals(takeMoney)){
			account.takeMoney(takeMoney);
		}
			
	}
	
	
	
	public static void main(String[] args) {
		Accounts accounts =  new Accounts();
		accounts.setToalMoney(BigDecimal.valueOf(0));
		
		person a1 = new person("pipi", accounts, BigDecimal.valueOf(50), BigDecimal.valueOf(30));
		person a2 = new person("pipi", accounts, BigDecimal.valueOf(20), BigDecimal.valueOf(30));
		person a3 = new person("pipi", accounts, BigDecimal.valueOf(10), BigDecimal.valueOf(80));
		new Thread(a1).start();
		new Thread(a2).start();
		new Thread(a3).start();
	}
}


package  demo.Threaddemo;

import java.math.BigDecimal;

 

/**
 * 用户的账户封装
 * @author Tom
 *
 */
public class Accounts {

	private BigDecimal toalMoney;

	public BigDecimal getToalMoney() {
		return toalMoney;
	}

	public void setToalMoney(BigDecimal toalMoney) {
		this.toalMoney = toalMoney;
	}
	
	public synchronized void saveMoney(BigDecimal money){
		System.out.println("当前余额为："+toalMoney+"正在存钱..."+money);
		
		toalMoney =  toalMoney.add(money);
		
		System.out.println("当前余额为："+toalMoney+"存钱结束....");
	}
	
	public synchronized void takeMoney(BigDecimal money){
		System.out.println("当前余额为："+toalMoney+"正在取钱..."+money);
		 if(toalMoney.compareTo(money)==-1){
			 System.out.println("当前余额不足");
			 return;
		 }
		toalMoney  =  toalMoney.subtract(money);
		System.out.println("当前余额为："+toalMoney+"取钱结束....");
		
	}
	
	public static void main(String[] args) {
		Accounts accounts = new Accounts();
		accounts.setToalMoney(BigDecimal.valueOf(23.44));
		accounts.takeMoney(BigDecimal.valueOf(1.44));
		
		BigDecimal a = BigDecimal.valueOf(1.00);
		
		BigDecimal b = BigDecimal.valueOf(2.00);
		
		System.out.println(b.compareTo(a));
	}
	
}

Answer 2

public class Person implements Runnable{
private Account account;
private String username;
private double savemoneyn;
private double takemoneyn;
public Person(){}
public Person(String username,Account account,double savemoney,double takemoney){
this. username=username;
this. account=account;
this. savemoney=savemoney;
this. takemoney=takemoney;

}
public void run(){
System.out.println(this.username+"正在进行存取操作");
Thread.currentThread().sleep(1000);
account.saveMoney(savemoneyn);
account.takeMoney(takemoneyn);
System.out.println(this.username+"操作结束");
}
public static void main(String[] args) {
Account a=new Account ();
Person p1=new Person("p1",a,300,200);
Person p2=new Person("p1",a,500,100);
Person p3=new Person("p1",a,200,600);
new Thread(p1).start();
new Thread(p2).start();
new Thread(p3).start();
}
}

class Account {
double money;
public synchronized void saveMoney(double m){
amoney+=m;
System.out.println("存款成功,余额为："+amoney);
}
public synchronized void takeMoney(double m){
double tmp=amoney-m;
if(tmp>0){
amoney=tmp;
System.out.println("取款成功,余额为："+amoney);
}
else
System.out.println("超出余额");
}

}