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How can I use two threads for my application

I am still learning Java and I am currently on topics, so basically I'm trying to make an application in which we have an account, now I want to use two different threads. One that adds money to the account every 1 s and displays the balance, and the other, which removes a certain amount every 1 s from the account and displays the final balance. So I created my Account class and thus an object

public class Account {
private double money;

public double getMoney() {
    return money;
}

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

Account (double money){
    this.money=money;
}}

And I created two classes: one that adds the other, which outputs

public class Add extends Thread {
Account obj;
Add koi;
Add(Account obj){
    this.obj=obj;
}
public synchronized void add(Account obj, Add koi){
    this.obj=obj;
    this.koi=koi;
    while(obj.getMoney()<100){
double top= obj.getMoney()+10;
obj.setMoney(top);
System.out.println("The balance is : "+obj.getMoney());
try{
    Thread.sleep(1000);
    }
    catch(Exception e){
        System.out.println(e.toString());
    }}
}public void run(){
    add(obj,koi);}}



public class Withdraw extends Thread{
Account obj;
Withdraw koi;
Withdraw(Account obj){
    this.obj=obj;
}
public synchronized void with(Account obj, Withdraw koi){
    this.koi=koi;
    this.obj=obj;
    while (obj.getMoney()<100){
double top= obj.getMoney()-9;
obj.setMoney(top);
System.out.println("The balance is : "+obj.getMoney());
try{
    Thread.sleep(1000);
    }
    catch(Exception e){
        System.out.println(e.toString());
    }}
}public void run(){
  with(obj,koi);}}

Here is the main class:

public class Test {

public static void main(String[] args) {
    // TODO Auto-generated method stub
    Account Steve= new Account(10);
    Add test= new Add(Steve);
    Withdraw test1= new Withdraw(Steve);
    test.start();
    test1.start();
    }}

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+4
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, : :

public void add(Account obj, Add koi){
    this.obj=obj;
    this.koi=koi;
    while(obj.getMoney()<100)
    {
        synchronized(obj)
        {
            double top= obj.getMoney()+10;
            obj.setMoney(top);
            System.out.println("The balance is : "+obj.getMoney());
        }
        try{
            Thread.sleep(1000);
        }
        catch(Exception e){
            System.out.println(e.toString());
        }
    }

}


public void with(Account obj, Withdraw koi){
    this.koi=koi;
    this.obj=obj;
    while (obj.getMoney()<100)
    {
        synchronized(obj) 
        {
            double top= obj.getMoney()-9;
            obj.setMoney(top);
            System.out.println("The balance is : "+obj.getMoney());
        }
        try{
            Thread.sleep(1000);
        }
        catch(Exception e){
            System.out.println(e.toString());
        }
    }
}

synchrnozed(obj) , obj, ,

+3

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