必须实现抽象方法语句(在超类中)以返回语句的字符串表示。
所以我做了以下事情:
public abstract String statement(); //The abstract method in my super class
..和我的子类中的方法:
//@Override
public String statement()
{
return String.format("Account no %d has balance R%d and minimum balance R%d", accountNumber,balance,getMinBalance());
}
我的主类只是调用Account类(有问题的超类),如下所示:
new SavingsAccount(Integer.toString(ao[i]),ao[i+1],ao[a]); //ao being the array which contains the values.
但是,控制台只是终止而不显示任何内容(我也不熟悉实现)。
这是完整的代码:
主要的:
public class AccountList
{
public static void main(String[] args)
{
int[] ao = {00000,0,0,12345,500,250,23456,230,-50,34567,340,500,45678,-320,-50,56789,-320,-500};
for(int i=0;i<ao.length;i=i+3)
{
int a = i+2;
if(ao[a]>=0)
{
new SavingsAccount(Integer.toString(ao[i]),ao[i+1],ao[a]);
}
if(ao[a]<=0)
{
new ChequeAccount(Integer.toString(ao[i]),ao[i+1],ao[a]);
}
}
}
}
超级班:
public abstract class Account implements InterestAccount
{
static String accountNumber;
int balance;
public Account()
{
accountNumber = "00000";
balance = 0;
//statement();
}
public Account(String accountNumber,int balance)
{
setAccountNum(accountNumber);
setBalance(balance);
}
public void setAccountNum(String accNum)
{
accountNumber = accNum;
}
public void setBalance(int balance)
{
this.balance = balance;
}
public String getAccountNumber()
{
return accountNumber;
}
public int getBalance()
{
return balance;
}
public abstract String statement();
}
子类之一:
public class SavingsAccount extends Account
{
int minBalance;
public SavingsAccount()
{
super();
minBalance = 0;
}
public SavingsAccount(String accountNum,int minBalance,int balance)
{
super(accountNum,balance);
setMinBalance(minBalance);
}
public void setMinBalance(int minBalance)
{
this.minBalance = minBalance;
}
public int getMinBalance()
{
return minBalance;
}
@Override
public int calculateInterest(int value) {
if(minBalance>balance)
{
return 0;
}
else
{
return (minBalance*balance)/100;
}
}
//@Override
public String statement()
{
return String.format("Account no %d has balance R%d and minimum balance R%d", accountNumber,balance,getMinBalance());
}
}