[英]How can I print the first balance, then the new balance?
I've written a small assignment where I've created a TimeDepositAccount
and am creating a method to get the current balance, new balance after calculating the interest, and then a withdraw method.我写了一个小作业,我创建了一个
TimeDepositAccount
并创建了一个方法来获取当前余额,计算利息后的新余额,然后是一个提取方法。 I'm stuck on printing the new balance to System.out
since for some reason, I'm unable to get the new balance.我一直坚持将新余额打印到
System.out
,因为由于某种原因,我无法获得新余额。 Second, I want to use a local variable for the withdraw method since in our upcoming test we'll be tested on those, but we never did them in class so I'm unsure as how to go about that.其次,我想为提取方法使用局部变量,因为在我们即将进行的测试中,我们将对其进行测试,但我们从未在 class 中做过它们,所以我不确定如何使用 go。
public class TimeDepositAccount {
//instance fields
private double currentBalance;
private double interestRate;
//Constructors
public TimeDepositAccount(){}
public TimeDepositAccount(double Balance1, double intRate){
currentBalance = Balance1;
interestRate = intRate;
}
//Methods
public double getcurrentBalance(){
return currentBalance;
}
public void newBalance(){
currentBalance = currentBalance * (1 + (interestRate/ 100) );
}
public double getintRate(){
return interestRate;
}
public String toString(){
return "TimeDepositAccount[ currentBalance = "+getcurrentBalance()+",
interestRate = "+getintRate()+"]";
}
public class TimeDepositAccountTester{
public static void main (String[] args){
TimeDepositAccount tda = new TimeDepositAccount(10,2);
double currentBalance = tda.getcurrentBalance();
System.out.println(currentBalance);
tda.newBalance();
System.out.print(currentBalance);
}
}
I wanted the output to first print 10.0, then 10.2, but instead I get 10.0 both times.我希望 output 先打印 10.0,然后打印 10.2,但我两次都得到 10.0。
You would want to change your main method to the following:您可能希望将 main 方法更改为以下内容:
public static void main (String[] args){
TimeDepositAccount tda = new TimeDepositAccount(10,2);
double currentBalance = tda.getcurrentBalance();
System.out.println(currentBalance);
tda.newBalance();
currentBalance = tda.getcurrentBalance();
System.out.print(currentBalance);
}
The variable currentBalance
stores what the balance was when you defined it.变量
currentBalance
存储定义时的余额。 Changing the balance of tda
does not change the value of currentBalance
.更改
tda
的余额不会更改currentBalance
的值。 Thus, to update the value of currentBalance
, you need to run currentBalance = tda.getcurrentBalance();
因此,要更新
currentBalance
的值,您需要运行currentBalance = tda.getcurrentBalance();
again.再次。
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