如何传递一个方法从不同的类到另一个类在Java？ [英] how to pass a method from different class to another class in Java?

问题描述

有2个文件命名：

1. AnnuityDueGUI.java


2. AnnuityDueResultGUI.java
3. 
   

1. AnnuityDueGUI.java
2. AnnuityDueResultGUI.java

在AnnuityDueGUI.java中，有如下方法：

Under AnnuityDueGUI.java, there is this method as below:

== ===========

=============

public double calculateFADGUI(){
        //FVA = A{[(1+i)^n – 1] / i} (1+i)
        String amountStr = amount.getText() ;  //convert string to double
        dAmount = Double.parseDouble(amountStr) ;
        String iStr = iText.getText() ;
        dInterest = Double.parseDouble(iStr) ;
        String periodStr = period.getText() ;
        dPeriod = Double.parseDouble(periodStr) ;
        iPeriod = (int)dPeriod ;
        due = new Annuity(dAmount, dInterest, iPeriod) ;
        System.out.println(due.calculateFAD()) ;
        return due.calculateFAD() ;   //calculateFAD() is under Annuity.java
    }

====== =========

===============

在AnnuityDueResultGUI.java中，如何从上面提到的方法获取结果？两个类都在同一个包GUI。我也做了 import AnnuityDueGUI。*;

Under AnnuityDueResultGUI.java, how to grab the result from the method that I've stated above?both classes are under the same package "GUI". I also did import AnnuityDueGUI.* ;

但是还是不知道如何从AnnuityDueGUI获取结果。并在AnnuityDueResultGUI.java下显示它。

But still have no idea on how to grab the result from AnnuityDueGUI.java and display it under AnnuityDueResultGUI.java.

请提前协助并感谢。

推荐答案

您将需要对AnnuityDueResultGUI中的AnnuityDueGUI对象的引用。例如

You will need a reference to the AnnuityDueGUI object in AnnuityDueResultGUI. So for instance

AnnuityDueGUI adg = new AnnuityDueGUI()
double result = adg.calculateFADGUI()

UPDATE ：

如果你碰巧已经在其他地方构造AnnuityDueGUI，你只需要传递对AnnuityDueResultGUI的引用

Also if you happen to already be constructing the AnnuityDueGUI somewhere else you can just pass the reference to AnnuityDueResultGUI

public AnnuityDueResultGui(AnnuityDueGUI adg) {
    this.adg = adg;
}

private void otherFunc () {
    double results = this.adg.calculateFADGUI()
}

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