Question

我必须使这个GUI成为CD计算器。

I put in the Initial investment ($): e.g. 2000
the Annual interest rate (%): e.g. (8%)
Ending value ($): e.g. 5000

程序然后在jLabel上输出：所需的年数为“12”（例如）

我需要做一个while循环和一个计数器。

我从3个文本字段中获取了获取文本，然后使用年费率％添加initialInvestment，但是在循环和计数器方面遇到了问题？

int initialInvestment, endValue, cdvalue;
double cdValue, annualDecimalConvert, annualRate;

initialInvestment = Integer.parseInt(initialInvestmentInput.getText());
annualRate = Double.parseDouble(interestRateInput.getText())/100;
endValue = Integer.parseInt(endingValueInput.getText());

cdValue = initialInvestment + (initialInvestment * annualRate);

double a = cdValue;
while (a <= endValue){
    a = a++;
    yearsOutput.setText("The required year needed is: " + a);
}

Answer 1

您只需在循环的每次迭代中向a添加1。因此，需要几千次迭代才能满足循环要求。

你要做的就是每年不断增加兴趣，同时保持年份的数量，只有在你完成循环后才更新输出。

int initialInvestment, endValue;
double cdValue, annualDecimalConvert, annualRate;

initialInvestment = Integer.parseInt(initialInvestmentInput.getText());
annualRate = Double.parseDouble(interestRateInput.getText())/100;
endValue = Integer.parseInt(endingValueInput.getText());

// First year interest is counted here.
cdValue = initialInvestment + (initialInvestment * annualRate);
int years = 1;

while (cdValue < endValue){
  cdValue = cdValue + (cdValue * annualRate);
  years++;
}

yearsOutput.setText("The required year needed is: " + years);

初学者循环GUI

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