用JAVA设计一个银行类，要求只是能编译、能运行、但是要联系银行存取款的实际操作。感激不尽，感激不尽~~~

package cn.fylsh
public class BankAccount{
private long moneynum;

//存款
public void addAccount(long num){
moneynum+=num;
}
//取款
public void loadAccount(long num){
moneynum-=num;
}
public String toString(){
return String.valueOf(moneynum);

}
public void setMoneynum(long moneynum){
this.moneynum=moneynum;
}
}