当我尝试继承时,出现错误“CheckingAccount 已在 null 中定义”。这是什么意思,我该如何解决?
这是我拥有的代码:
public class BankAccount
{
double balance;
public void Bankaccount() {
balance = 0;
}
public BankAccount(double initialBalance) {
initialBalance = balance;
}
public void deposite(double amount) {
balance = balance + amount;
}
public void withdraw(double amount) {
balance = balance - amount;
}
public double getBalance(double balance) {
return balance;
}
public void transfer(double amount, double bankAccountOther) {
balance = balance - amount;
}
}
public class CheckingAccount
{
public class CheckingAccount extends BankAccount {
}
}
谁能帮帮我,我真的不明白这是什么意思