java - 如何从另一种方法获取 JTextArea 文本

Question

我想使用另一个类中的方法附加到我的 JTextArea 中(在我的代码中文本在这里)，该怎么做？

 SecondWindow() {

    super("Mortage Loan Calculator");
    setLayout(new FlowLayout(FlowLayout.LEFT, 20, 20));

    tArea = new JTextArea(***TEXT IS HERE***, 30, 40);
    scroll = new JScrollPane(tArea);
    add(scroll);
    setLocationRelativeTo(null);`

`这是一个方法:

public void calcAnnuity(int years, int months, double amount, double rate){
    double totalMonths = (12 * years) + months;
    double partOfRate = rate / 12.0 / 100.0;
    double tempAmount = amount;
    double payment = amount * partOfRate * Math.pow(1 + partOfRate, totalMonths) / (Math.pow(1 + partOfRate, totalMonths) - 1); //mathematical formula

    DecimalFormat decFormat = new DecimalFormat("#.##");

    System.out.println(1 + " Payment = " + decFormat.format(payment) + "--- Left to pay: " + decFormat.format(amount));

    for(int i = 2; i <= totalMonths; i++) {
        tempAmount -= (payment - partOfRate * amount);
        amount -= payment;
        **textishere.append**(i + " Payment = " + decFormat.format(payment) + " --- Left to pay: " + decFormat.format(tempAmount));
    }
}

Answer 1

嗯，最简单的方法是在 JTextArea 所在的 ClassA 中实现一个公共(public)静态方法。

public static setJTextAreaText(String text){
   tArea.setText(text);
}

在 ClassB 中导入 ClassA，然后从方法 calcAnnuity() 调用此方法

import ClassA;

public void calcAnnuity(int years, int months, double amount, double rate){

   ...

   ClassA.setJTextAreaText('**textishere.append**');
}