Simulate thread communication

1： Shared resources operated by multiple threads ：User class contain money deposit , And how to save and withdraw money

public class User {
    private double money;

    public User() {
    }

    public User(double money) {
        this.money = money;
    }

    public double getMoney() {
        return money;
    }

    public void setMoney(double money) {
        this.money = money;
    }

    /***
     *  A way to save money 
     * @param money
     */
    public synchronized void updateMoney(Double money){
        try {
            System.out.println(Thread.currentThread()+" Came in ");
            Thread.sleep(2000);
            if(this.money==0){
                this.money+=money;
                System.out.println(Thread.currentThread()+" Deposit money "+money);
                this.notifyAll();
                this.wait();
            }else{
                this.notifyAll();
                this.wait();
            }
        } catch (InterruptedException e) {
            e.printStackTrace();
        }
    }
    /***
     *  The method of withdrawing money 
     * @param v
     */
    public synchronized void deleteMoney(double v) {
        try {
            System.out.println(Thread.currentThread()+" Came in ");
            Thread.sleep(2000);
            if(this.money>=v){
                this.money-=v;
                System.out.println(Thread.currentThread()+" Withdraw money "+v);
                this.notifyAll();
                this.wait();
            }else{
                this.notifyAll();
                this.wait();
            }
        } catch (InterruptedException e) {
            e.printStackTrace();
        }
    }
}

Create two threads ： Deposit thread and withdrawal thread

// Withdraw money 
public class GetThread extends Thread{
    private User user;

    public GetThread(User user,String name) {
        super(name);
        this.user = user;
    }
    @Override
    public void run(){
        while (true) {
            user.deleteMoney(1000.0);
        }
    }
}

// Deposit money 
public class SetThread extends Thread {
    private User user;

    public SetThread(User user,String name) {
        super(name);
        this.user = user;
    }
    @Override
    public void run(){
        while (true) {
            user.updateMoney(10000.0);
        }
    }
}

Main method ：

public class TestDamo {
    
    public static void main(String[] args) {
        User user=new User(1000);
        new GetThread(user," Xiao Ming 1").start();
        new GetThread(user," Xiao Ming 2").start();

        new SetThread(user," Xiaohong 1").start();
        new SetThread(user," Xiaohong 2").start();
        new SetThread(user," Xiaohong 3").start();
    }
}