一个对话框，怎么在点击“取消”按钮的同时取消已选中的单选按钮

Question

    这个问题已经困扰我好久了，希望有高手可以帮我解答！谢谢
    我要做一个对话框，是输入学生信息的，其中用单选按钮来选择性别，用JTextField输入学号等，当我输入后想要清空已输入的信息，JTextField的清空可以在ActionListener中用setText("");来实现，但是单选按钮我用setSelected(false);就是不能清空选中状态，希望大家能帮帮我，谢谢了！

Answer 1

用setSelected(false)；应该没有问题吧；下面是我的代码，测试过了，没有问题，可以清空
package com.monitor1394.tabletest;/*
 * StudentDialog.java
 * 
 * 学生信息输入面板
 *
 * @author monitor
 * Created on 2010-12-23, 17:12:21
 */
public class StudentDialog extends javax.swing.JDialog {    public StudentDialog(java.awt.Frame parent) {
        super(parent, true);
        initComponents();
    }    @SuppressWarnings("unchecked")
    // <editor-fold defaultstate="collapsed" desc="Generated Code">
    private void initComponents() {        jLabel1 = new javax.swing.JLabel();
        jLabel2 = new javax.swing.JLabel();
        jLabel3 = new javax.swing.JLabel();
        idField = new javax.swing.JTextField();
        nameField = new javax.swing.JTextField();
        boyButton = new javax.swing.JRadioButton();
        sureButton = new javax.swing.JButton();
        clearButton = new javax.swing.JButton();        setDefaultCloseOperation(javax.swing.WindowConstants.DISPOSE_ON_CLOSE);        jLabel1.setText("学号：");        jLabel2.setText("姓名：");        jLabel3.setText("性别：");        boyButton.setText("男");        sureButton.setText("确认");
        sureButton.addActionListener(new java.awt.event.ActionListener() {
            public void actionPerformed(java.awt.event.ActionEvent evt) {
                sureButtonActionPerformed(evt);
            }
        });        clearButton.setText("清空");
        clearButton.addActionListener(new java.awt.event.ActionListener() {
            public void actionPerformed(java.awt.event.ActionEvent evt) {
                clearButtonActionPerformed(evt);
            }
        });        javax.swing.GroupLayout layout = new javax.swing.GroupLayout(getContentPane());
        getContentPane().setLayout(layout);
        layout.setHorizontalGroup(
            layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING)
            .addGroup(layout.createSequentialGroup()
                .addGap(35, 35, 35)
                .addGroup(layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING)
                    .addGroup(layout.createSequentialGroup()
                        .addGap(29, 29, 29)
                        .addComponent(sureButton)
                        .addGap(18, 18, 18)
                        .addComponent(clearButton))
                    .addGroup(layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING, false)
                        .addGroup(layout.createSequentialGroup()
                            .addComponent(jLabel3)
                            .addPreferredGap(javax.swing.LayoutStyle.ComponentPlacement.RELATED)
                            .addComponent(boyButton))
                        .addGroup(layout.createSequentialGroup()
                            .addComponent(jLabel2)
                            .addPreferredGap(javax.swing.LayoutStyle.ComponentPlacement.RELATED)
                            .addComponent(nameField))
                        .addGroup(layout.createSequentialGroup()
                            .addComponent(jLabel1)
                            .addPreferredGap(javax.swing.LayoutStyle.ComponentPlacement.RELATED)
                            .addComponent(idField, javax.swing.GroupLayout.PREFERRED_SIZE, 157, javax.swing.GroupLayout.PREFERRED_SIZE))))
                .addContainerGap(43, Short.MAX_VALUE))
        );
        layout.setVerticalGroup(
            layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING)
            .addGroup(layout.createSequentialGroup()
                .addGap(21, 21, 21)
                .addGroup(layout.createParallelGroup(javax.swing.GroupLayout.Alignment.BASELINE)
                    .addComponent(jLabel1)
                    .addComponent(idField, javax.swing.GroupLayout.PREFERRED_SIZE, javax.swing.GroupLayout.DEFAULT_SIZE, javax.swing.GroupLayout.PREFERRED_SIZE))
                .addPreferredGap(javax.swing.LayoutStyle.ComponentPlacement.UNRELATED)
                .addGroup(layout.createParallelGroup(javax.swing.GroupLayout.Alignment.BASELINE)
                    .addComponent(jLabel2)
                    .addComponent(nameField, javax.swing.GroupLayout.PREFERRED_SIZE, javax.swing.GroupLayout.DEFAULT_SIZE, javax.swing.GroupLayout.PREFERRED_SIZE))
                .addPreferredGap(javax.swing.LayoutStyle.ComponentPlacement.UNRELATED)
                .addGroup(layout.createParallelGroup(javax.swing.GroupLayout.Alignment.BASELINE)
                    .addComponent(jLabel3)
                    .addComponent(boyButton))
                .addPreferredGap(javax.swing.LayoutStyle.ComponentPlacement.RELATED, 17, Short.MAX_VALUE)
                .addGroup(layout.createParallelGroup(javax.swing.GroupLayout.Alignment.BASELINE)
                    .addComponent(clearButton)
                    .addComponent(sureButton))
                .addContainerGap())
        );        pack();
    }// </editor-fold>    private void clearButtonActionPerformed(java.awt.event.ActionEvent evt) {
        idField.setText(null);
        nameField.setText(null);
        boyButton.setSelected(false);
    }    private void sureButtonActionPerformed(java.awt.event.ActionEvent evt) {
        //do something
    }    // Variables declaration - do not modify
    private javax.swing.JRadioButton boyButton;
    private javax.swing.JButton clearButton;
    private javax.swing.JTextField idField;
    private javax.swing.JLabel jLabel1;
    private javax.swing.JLabel jLabel2;
    private javax.swing.JLabel jLabel3;
    private javax.swing.JTextField nameField;
    private javax.swing.JButton sureButton;
    // End of variables declaration
}

Answer 2

我把我自己的代码发上来给大家分析一下吧
//录入界面
import javax.swing.*;
import javax.swing.plaf.basic.BasicBorders.RadioButtonBorder;import java.awt.*;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;//public class StudentSituation extends JFrame{
public class StudentSituation extends JFrame{

JTextField jtfNum = new JTextField();
JButton jbAdd = new JButton("录入");

JTextField jtfName = new JTextField("");
JButton jbCancel = new JButton("取消");
JPanel jpSex = new JPanel();
JRadioButton jrbMan = new JRadioButton("男");
JRadioButton jrbWoman = new JRadioButton("女");
JTextField jtfMajor = new  JTextField("");
JTextField jtfAddr = new JTextField("");
JTextField jtfBirth = new JTextField("");

public StudentSituation(){
GridLayout mainInquestFrame = new GridLayout(8,3,5,5);
setLayout(mainInquestFrame);
ActionListener okListener = new okListener();
jbAdd.addActionListener(okListener);
ActionListener cancellistener = new cancelListener();
jbCancel.addActionListener(cancellistener);
//jbCancel.addActionListener(cancelListener);
add(new JLabel());
add(new JLabel());
add(new JLabel());
add(new JLabel("          输入要查询的学号："));
//JTextField jtfNum = new JTextField();
add(jtfNum);
//JButton jbAdd = new JButton("录入");
add(jbAdd);
add(new JLabel("          姓名："));
//JTextField jtfName = new JTextField("");

add(jtfName);
//JButton jbCancel = new JButton("取消");
add(jbCancel);

add(new JLabel("          性别："));

ButtonGroup bgSex = new ButtonGroup();
//JPanel jpSex = new JPanel();
//JRadioButton jrbMan = new JRadioButton("男");
//JRadioButton jrbWoman = new JRadioButton("女");
bgSex.add(jrbMan);
bgSex.add(jrbWoman);
jpSex.add(jrbMan,true);
jpSex.add(jrbWoman);
//jpSex.setEnabled(false);
add(jpSex);

//jrbMan.setSelected(true);
jrbMan.setSelected(false);
add(new JLabel());

add(new JLabel("          所学专业："));
//JTextField jtfMajor = new  JTextField("");
add(jtfMajor);
add(new JLabel());

add(new JLabel("          家庭住址"));
//JTextField jtfAddr = new JTextField("");
add(jtfAddr);
add(new JLabel());

add(new JLabel("          出生日期"));
add(jtfBirth);
add(new JLabel());

}
private class okListener implements ActionListener{
public void actionPerformed(ActionEvent e){

StudentManager.stuInfo[StudentManager.s] = new StudentInfo();
StudentManager.stuInfo[StudentManager.s].setNum(jtfNum.getText());
StudentManager.stuInfo[StudentManager.s].setName(jtfName.getText());
if(jrbMan.isSelected())
StudentManager.stuInfo[StudentManager.s].setSex(true);
else
StudentManager.stuInfo[StudentManager.s].setSex(false);

StudentManager.stuInfo[StudentManager.s].setMajor(jtfMajor.getText());
StudentManager.stuInfo[StudentManager.s].setAddr(jtfAddr.getText());
StudentManager.stuInfo[StudentManager.s].setBirth(jtfBirth.getText());
System.out.println(jtfNum.getText() + jtfName.getText() + 
jtfMajor.getText());

StudentManager.s++;
}
}
private class cancelListener implements ActionListener{
public void actionPerformed(ActionEvent e){
jtfNum.setText(null);
jtfName.setText(null);
jrbMan.setSelected(false);
jrbWoman.setSelected(false);//!!!!!!!就是这里了！
jtfMajor.setText(null);
jtfAddr.setText(null);
jtfBirth.setText(null);

}
}

}

Answer 3

ButtonGroup的原因
要加一句
bgSex.clearSelection();
不过为了这样要把你的
bgSex的定义放到类的定义部分import java.awt.GridLayout;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;import javax.swing.ButtonGroup;
import javax.swing.JButton;
import javax.swing.JFrame;
import javax.swing.JLabel;
import javax.swing.JPanel;
import javax.swing.JRadioButton;
import javax.swing.JTextField;public class StudentSituation extends JFrame { JTextField jtfNum = new JTextField();
JButton jbAdd = new JButton("录入"); JTextField jtfName = new JTextField("");
JButton jbCancel = new JButton("取消");
JPanel jpSex = new JPanel();
ButtonGroup bgSex = new ButtonGroup();
JRadioButton jrbMan = new JRadioButton("男");
JRadioButton jrbWoman = new JRadioButton("女");
JTextField jtfMajor = new JTextField("");
JTextField jtfAddr = new JTextField("");
JTextField jtfBirth = new JTextField("");

public static void main(String[] args) {
new StudentSituation().setVisible(true);
} public StudentSituation() {
GridLayout mainInquestFrame = new GridLayout(8, 3, 5, 5);
setLayout(mainInquestFrame);
ActionListener okListener = new okListener();
jbAdd.addActionListener(okListener);
ActionListener cancellistener = new cancelListener();
jbCancel.addActionListener(cancellistener);
add(new JLabel());
add(new JLabel());
add(new JLabel());
add(new JLabel(" 输入要查询的学号："));
// JTextField jtfNum = new JTextField();
add(jtfNum);
// JButton jbAdd = new JButton("录入");
add(jbAdd);
add(new JLabel(" 姓名："));
// JTextField jtfName = new JTextField(""); add(jtfName);
// JButton jbCancel = new JButton("取消");
add(jbCancel); add(new JLabel(" 性别：")); bgSex.add(jrbMan);
bgSex.add(jrbWoman);
jpSex.add(jrbMan, true);
jpSex.add(jrbWoman);
// jpSex.setEnabled(false);
add(jpSex); // jrbMan.setSelected(true);
jrbMan.setSelected(false);
add(new JLabel()); add(new JLabel(" 所学专业："));
// JTextField jtfMajor = new JTextField("");
add(jtfMajor);
add(new JLabel()); add(new JLabel(" 家庭住址"));
// JTextField jtfAddr = new JTextField("");
add(jtfAddr);
add(new JLabel()); add(new JLabel(" 出生日期"));
add(jtfBirth);
add(new JLabel()); } private class okListener implements ActionListener {
public void actionPerformed(ActionEvent e) { StudentManager.stuInfo[StudentManager.s] = new StudentInfo();
StudentManager.stuInfo[StudentManager.s].setNum(jtfNum.getText());
StudentManager.stuInfo[StudentManager.s].setName(jtfName.getText());
if (jrbMan.isSelected())
StudentManager.stuInfo[StudentManager.s].setSex(true);
else
StudentManager.stuInfo[StudentManager.s].setSex(false); StudentManager.stuInfo[StudentManager.s].setMajor(jtfMajor
.getText());
StudentManager.stuInfo[StudentManager.s].setAddr(jtfAddr.getText());
StudentManager.stuInfo[StudentManager.s].setBirth(jtfBirth
.getText());
System.out.println(jtfNum.getText() + jtfName.getText()
+ jtfMajor.getText()); StudentManager.s++;
}
} private class cancelListener implements ActionListener {
public void actionPerformed(ActionEvent e) {
jtfNum.setText(null);
jtfName.setText(null);
jrbMan.setSelected(false);
jrbWoman.setSelected(false);// !!!!!!!就是这里了！
jtfMajor.setText(null);
jtfAddr.setText(null);
jtfBirth.setText(null);
bgSex.clearSelection();
}
}}

Answer 4

百度到此、受教了、3Q。。sunyiz