オブジェクト向けhomework

public class Homework{public static void main(String[]args){Account a=new Account("1000",2000.0,1.23);Customer c=new Customer("Jane Smith",a);//スミス操作、100元預け、960元取り出し、2000元c.getAct().deposit(100);c.getAct().withdraw(960);c.getAct().withdraw(2000);class Customer{ private String name; private Account act; public Customer(){

}
public Customer(String name,Account act){
    this.name=name;
    this.act=act;
}
public void setName(String name){
    this.name=name;
}
public String getName(){
    return name;
}
public void setAct(Account act){
    this.act=act;
}
public Account getAct(){
    return act;
}

}class Account{private String id;private double balance;private double liXi;//パラメータなし構築方法public Account(){

}
// 
public Account(String id,double balance,double liXi){
    this.id=id;
    this.balance=balance;
    this.liXi=liXi;
}
public void setId(String id){
    this.id=id;
}
public String getID(){
    return id;
}
public void setBalance(double balance){
    this.balance=balance;
}
public double getBalance(){
    return balance;
}
public void setLiXi(double liXi){
    this.liXi=liXi;
}
public double getLiXi(){
    return liXi;
}
// 
// 
public void withdraw(double money){
    if(money>this.getBalance()){
        System.out.println(" ， ");
        return;
    }
    this.setBalance(this.getBalance()-money);
    System.out.println(" "+money);
}
// 
// 
public void deposit(double money){
    this.setBalance(this.getBalance()+money);
    System.out.println(" "+money);
}

}