Question

我正在为我的任务写一个小体重计划。我有2个JRadioButton用于性别，5个JRadioButton用于高度类别。我为每个按钮添加了一个ActionListener。在actionPerformed函数中，如何设置一个if（）条件，让我根据性别和身高决定理想体重？

if(e.getSource() == genderM && e.getSource() == h60 )

似乎没有用。

问题明确指出应该在没有提交按钮的情况下完成。

这是我正在使用的代码：

public class IdealWeight extends JFrame implements ActionListener {

JLabel lblHeight;
JLabel lblGender;
JLabel lblIdeal;
JRadioButton genderM;
JRadioButton genderF;
JRadioButton h60;
JRadioButton h64;
JRadioButton h68;
JRadioButton h72;
JRadioButton h76;
JTextField txtIdealWeight;

public IdealWeight(){
    super("Ideal Wight");
    JPanel p1 = new JPanel();
    JPanel p2 = new JPanel();
    JPanel p3 = new JPanel();
    p1.setLayout(new GridLayout(3,1));
    p2.setLayout(new GridLayout(6,1));
    lblGender = new JLabel("Your gender: ");
    lblHeight = new JLabel("Your height: ");
    lblIdeal = new JLabel("Your ideal weight: ");
    this.setLayout(new GridLayout(2,3));
    ButtonGroup genderGroup = new ButtonGroup();
    ButtonGroup weightGroup = new ButtonGroup();
    genderM = new JRadioButton("Male: ");
    genderM.addActionListener(this);
    genderF = new JRadioButton("Female: ");
    genderF.addActionListener(this);
    h60 = new JRadioButton("60 to 64 inches");
    h60.addActionListener(this);
    h64  = new JRadioButton("64 to 68 inches");
    h64.addActionListener(this);
    h68  = new JRadioButton("68 to 72 inches");
    h68.addActionListener(this);
    h72  = new JRadioButton("72 to 76 inches");
    h72.addActionListener(this);
    h76  = new JRadioButton("76 to 80 inches");
    h76.addActionListener(this);
    txtIdealWeight = new JTextField();
    txtIdealWeight.setEditable(false);
    txtIdealWeight.setColumns(5);

    genderGroup.add(genderM);
    genderGroup.add(genderF);
    weightGroup.add(h60);
    weightGroup.add(h64);
    weightGroup.add(h68);
    weightGroup.add(h72);
    weightGroup.add(h76);
    p1.add(lblGender);
    p1.add(genderM);
    p1.add(genderF);

    p2.add(lblHeight);
    p2.add(h60);
    p2.add(h64);
    p2.add(h68);
    p2.add(h72);
    p2.add(h76);

    p3.add(lblIdeal);
    p3.add(txtIdealWeight);


    this.add(p1);
    this.add(p2);
    this.add(p3);

    this.setVisible(true);
    this.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
    this.setSize(new Dimension(400,400));


}

Answer 1

由于用户需要在准确处理之前输入所有字段中的信息，我不会在JCheckBoxes或JRadioButtons上使用ActionListeners，而是使用单个JButton，比如称为submitButton，然后从GUI中提取数据在其ActionListener中。

您可以从您正在使用的每个ButtonGroup对象中获取所选项目，因为它将返回所选JRadioButton的ButtonModel，如果没有选择任何内容，则返回null。

如果您需要更多帮助，请询问并编辑您的问题，以便向我们展示更相关的代码。

修改
您在评论中说明：

问题明确指出应该在没有提交按钮的情况下完成

这是关键信息，应该是原始问题的一部分。

然后使用一个ActionListener，不要担心来源。而是在ActionListener中，查询所有JRadioButtons的状态，然后对其进行操作，或者从ButtonGroups中获取模型并执行相同的操作。

例如：

import java.awt.GridLayout; import java.awt.event.ActionEvent; import java.awt.event.ActionListener; import javax.swing.*; public class TwoButtonGroups extends JPanel { public static final String[] LABELS_1 = {"Monday", "Tuesday", "Wednesday", "Thursday", "Friday"}; public static final String[] LABELS_2 = {"Fubar", "Snafu", "DILLIGAF"}; private ButtonGroup buttonGroup1 = new ButtonGroup(); private ButtonGroup buttonGroup2 = new ButtonGroup(); public TwoButtonGroups() { JPanel panel1 = new JPanel(new GridLayout(0, 1)); JPanel panel2 = new JPanel(new GridLayout(0, 1)); MyActionListener myActionListener = new MyActionListener(); for (String label1 : LABELS_1) { JRadioButton radioButton = new JRadioButton(label1); radioButton.setActionCommand(label1); radioButton.addActionListener(myActionListener); buttonGroup1.add(radioButton); panel1.add(radioButton); } for (String label2 : LABELS_2) { JRadioButton radioButton = new JRadioButton(label2); radioButton.setActionCommand(label2); radioButton.addActionListener(myActionListener); buttonGroup2.add(radioButton); panel2.add(radioButton); } add(panel1); add(panel2); } private class MyActionListener implements ActionListener { @Override public void actionPerformed(ActionEvent e) { ButtonModel model1 = buttonGroup1.getSelection(); ButtonModel model2 = buttonGroup2.getSelection(); if (model1 == null || model2 == null) { return; // not selected } System.out.printf("Selections: %s and %s%n", model1.getActionCommand(), model2.getActionCommand() ); } } private static void createAndShowGui() { TwoButtonGroups mainPanel = new TwoButtonGroups(); JFrame frame = new JFrame("TwoButtonGroups"); frame.setDefaultCloseOperation(JFrame.DISPOSE_ON_CLOSE); frame.getContentPane().add(mainPanel); frame.pack(); frame.setLocationByPlatform(true); frame.setVisible(true); } public static void main(String[] args) { SwingUtilities.invokeLater(new Runnable() { public void run() { createAndShowGui(); } }); } }

Answer 2

条件

e.getSource() == genderM && e.getSource() == h60

永远不会返回true，因为源是genderM或h60。也许你的意思是逻辑或。

e.getSource() == genderM || e.getSource() == h60

作为替代方案，我会忽略事件的来源，而是使用组件的状态代替..

@Override
public void actionPerformed(ActionEvent e) {
    if (genderM.isSelected() && h60.isSelected()) {

    }
}

两个JCheckbox来源？

2 个答案: