需要帮助将文本从 Java 中的另一个类打印到 TextArea

Question

只需要一些帮助将文本打印到类项目的TextArea。我有一种方法可以生成 5-0 之间的 100 个随机数，并希望它打印到 TextArea，但我不确定如何做到这一点。（现在我只有 Syste.out.println 作为占位符，但我想删除它）

    public class Interface
{   
    public Interface()
    {
    }
    public static void randomNumber()
    {
        Random randomNumber = new Random();
        System.out.println("Generating 5 Random Numbers.");
        for (int randomNum = 1; randomNum <=  5; ++randomNum)
        {
            int randomInt = randomNumber.nextInt(5);
            System.out.println("Random Number: " + randomInt);
        }
    System.out.println("Done.");
    }
}

public class InterfacePanel extends JPanel
{
    private InterfaceController baseController;
    private SpringLayout baseLayout;
    private JButton buttonOne;
    private JButton buttonTwo;
    private JButton buttonThree;
    private JButton buttonFour;
    private JLabel lableOne;
    private JLabel lableTwo;
    private JLabel lableThree;
    private JLabel lableFour;
    private TextArea textField;
    public InterfacePanel(InterfaceController baseController)
    {
        setBackground(Color.DARK_GRAY);
        this.baseController = baseController;
        buttonOne = new JButton("Random Numbers");
        buttonTwo = new JButton("Two");
        buttonThree = new JButton("Three");
        buttonFour = new JButton("Four");
        lableOne = new JLabel("5 Random Numbers");
        lableTwo = new JLabel("Two");
        lableThree = new JLabel("Three");
        lableFour = new JLabel("Four");
        baseLayout = new SpringLayout();
        textField = new TextArea();
        setupPanel();
        setupLayout();
        setupListeners();
    }
    private void setupPanel()
    {
        this.setLayout(baseLayout);
        this.add(lableOne);
        this.add(buttonOne);
        this.add(buttonTwo);
        this.add(buttonThree);
        this.add(buttonFour);
        this.add(lableTwo);
        this.add(lableThree);
        this.add(lableFour);
        this.add(textField);
    }
    private void setupLayout()
    private void setupListeners()
    {
        buttonOne.addActionListener(new ActionListener()
        {
            public void actionPerformed(ActionEvent click)
            {
                Interface.randomNumber();
            }
        });
        buttonTwo.addActionListener(new ActionListener()
        {
            public void actionPerformed(ActionEvent click)
            {
            }
        });
        buttonThree.addActionListener(new ActionListener()
        {
            public void actionPerformed(ActionEvent click)
            {
            }
        });
        buttonFour.addActionListener(new ActionListener()
        {
            public void actionPerformed(ActionEvent click)
            {
            }
        });
    }
}

Answer 1

在方法

中添加参数 JTextArea randomNumber()。

public static void randomNumber(JTextArea myText){
        Random randomNumber = new Random();
        System.out.println("Generating 5 Random Numbers.");
        for (int randomNum = 1; randomNum <=  5; ++randomNum)
        {
            int randomInt = randomNumber.nextInt(5);
            myText.setText(myText.getText() + randomInt + "n");
        }
    System.out.println("Done.");
}

并以这种方式调用InterfacePanel类中的randomNumber()方法

Interface.randomNumber(textField);