java - 将 JRadioSelection 传递给 ActionLIstener 类

Question

对于我的应用程序，我创建了两个 JRadioButton分组为“选择”ButtonGroup 。我添加了ActionListener称为“选择监听器”。当我检查我的 RadioButton 是否使用 isSelected() 选择，看来我的选择没有被传递到 ActionListener .

public static void main(String[] args) {
    JRadioButton monthlyRadioButton = new JRadioButton("Monthly Payment", true);
    JRadioButton loanAmountButton = new JRadioButton("Loan Amount");
    ButtonGroup selection = new ButtonGroup();
    selection.add(monthlyRadioButton);
    selection.add(loanAmountButton);
    monthlyRadioButton.addActionListener(new SelectionListener());
    loanAmountButton.addActionListener(new SelectionListener());
} 

SelectionListener.java

import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;

class SelectionListener implements ActionListener {
    public void actionPerformed(ActionEvent event){
      if(event.getSource() == monthlyRadioButton)
        System.out.println("You clicked Monthly");
      else
        System.out.println("You clicked Loan Amount");

    }
}

参数monthlyRadioButton没有被传递给我的 SelectionListener类(class)。我收到一条错误，表明该问题尚未解决。

如何通过 monthlyRadioButton在我的主要方法中转到我的 SelectionListener类？

Answer 1

您可以检索正在处理的事件的发送者。

类似于:

class SelectionListener implements ActionListener {
    private JComponent monthlyRadioButton;
    private JComponent loanAmountButton;

    public SelectionListener(JComponent monthlyRadioButton, JComponent loanAmountButton) {
        this.monthlyRadioButton = monthlyRadioButton;
        this.loanAmountButton = loanAmountButton;
    }

    public void actionPerformed(ActionEvent event){
        if(event.getSource() == monthlyRadioButton)
            System.out.println("You clicked Monthly");
        else if(event.getSource() == loanAmountButton)
            System.out.println("You clicked Loan Amount");
    }
}

在你的主要方法上，你可以像这样实例化它:

    monthlyRadioButton.addActionListener(new SelectionListener(monthlyRadioButton, loanAmountButton));