Question

我正在为投资组合创建贷款申请计划。但是，我似乎忘记了如何从另一个类调用/调用/创建方法。我确定我没有意义！这是我的代码片段：

  public class ButtonListener implements ActionListener{
  @Override
  public void actionPerformed (ActionEvent e){
    String firstName = LoanerFirstName.getText();
    String middleI = LoanerMiddleInitial.getText();
    String lastName = LoanerLastName.getText();
    double interest = Double.parseDouble(AIR.getText());
    int Years = Integer.parseInt(NumOfYears.getText());
    double loanAmount = Double.parseDouble(LoanAmount.getText());
    double monthlyPayment = Double.parseDouble(MonthlyPayment.getText());
    double totalPayment = Double.parseDouble(TotalPayment.getText()); 

    Loan loan = new Loan(interest, Years, loanAmount);
 MonthlyPayment.setText(String.format("%.2f", loan.getMonthlyPayment()));
 TotalPayment.setText(String.format("%.2f", loan.getTotalPayment()));
    }

“Loan”类未被识别（以红色加下划线;错误）。

P.S：我正在使用NetBeans 8.0 for Windows 8。

Answer 1

您必须在使用之前导入课程。

如果您使用：

Loan loan = new Loan(interest, Years, loanAmount);

验证您是否拥有该课程的import。

如果您在lib中使用类，请验证您的类路径中是否有jar文件，然后您需要为您需要的类导入。

Answer 2

 Dear Friend,

You first have to import the class you want to use if it is in different package as concerned to your present class as :

import packagename.Loan;
where packagename is the name of package containing Loan class

If the class Loan is in the same package then, you can access it directly as:

Create its object and call its constructor at the same time as ---- 
  Loan loan = new Loan(interest, Years, loanAmount);

And now using its object loan , you can access different data members of that class.
Hope this would effectively help you.
Thanks.

班级＆amp;对象无法识别

2 个答案: