Java中的JCheckBox问题？
这是我的代码在这里，我想得到如下输出，但有一些错误 --输出-- 名字叫阿伦，性别男。他什么都不喜欢 名字叫阿伦，性别男。他只喜欢板球 名字叫阿伦，性别男。他喜欢板球和网球 名字叫阿伦，性别男。他喜欢板球、足球和网球Java中的JCheckBox问题？,java,swing,actionlistener,jcheckbox,Java,Swing,Actionlistener,Jcheckbox,这是我的代码在这里，我想得到如下输出，但有一些错误 --输出-- 名字叫阿伦，性别男。他什么都不喜欢 名字叫阿伦，性别男。他只喜欢板球 名字叫阿伦，性别男。他喜欢板球和网球 名字叫阿伦，性别男。他喜欢板球、足球和网球 /* * Register.java * * Created on 8 October, 2014, 9:27 AM */ package Register; import java.awt.event.ActionEvent; import java.awt.even
/*
* Register.java
*
* Created on 8 October, 2014, 9:27 AM
*/
package Register;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;
/**
*
* @author DELL
*/
public class Register extends javax.swing.JFrame {
/** Creates new form Register */
public Register() {
initComponents();
initListener() ;
}
/** This method is called from within the constructor to
* initialize the form.
* WARNING: Do NOT modify this code. The content of this method is
* always regenerated by the Form Editor.
*/
@SuppressWarnings("unchecked")
// <editor-fold defaultstate="collapsed" desc="Generated Code">
private void initComponents() {
bg = new javax.swing.ButtonGroup();
buttonGroup2 = new javax.swing.ButtonGroup();
jPanel1 = new javax.swing.JPanel();
rb_female = new javax.swing.JRadioButton();
cb_cricket = new javax.swing.JCheckBox();
txt_name = new javax.swing.JTextField();
lbl_name = new javax.swing.JLabel();
cb_tennis = new javax.swing.JCheckBox();
jScrollPane1 = new javax.swing.JScrollPane();
ta_show = new javax.swing.JTextArea();
rb_male = new javax.swing.JRadioButton();
cb_football = new javax.swing.JCheckBox();
btn_show = new javax.swing.JButton();
lbl_hobbies = new javax.swing.JLabel();
lbl_gender = new javax.swing.JLabel();
setDefaultCloseOperation(javax.swing.WindowConstants.EXIT_ON_CLOSE);
jPanel1.setBorder(javax.swing.BorderFactory.createTitledBorder(null, "Register", javax.swing.border.TitledBorder.DEFAULT_JUSTIFICATION, javax.swing.border.TitledBorder.DEFAULT_POSITION, new java.awt.Font("Times New Roman", 1, 14))); // NOI18N
bg.add(rb_female);
rb_female.setFont(new java.awt.Font("Times New Roman", 1, 14));
rb_female.setText("Female");
cb_cricket.setFont(new java.awt.Font("Times New Roman", 1, 14));
cb_cricket.setText("Cricket");
lbl_name.setFont(new java.awt.Font("Times New Roman", 1, 14));
lbl_name.setText("Name");
cb_tennis.setFont(new java.awt.Font("Times New Roman", 1, 14));
cb_tennis.setText("Tennis");
ta_show.setColumns(20);
ta_show.setRows(5);
jScrollPane1.setViewportView(ta_show);
bg.add(rb_male);
rb_male.setFont(new java.awt.Font("Times New Roman", 1, 14));
rb_male.setText("Male");
cb_football.setFont(new java.awt.Font("Times New Roman", 1, 14));
cb_football.setText("Football");
btn_show.setFont(new java.awt.Font("Times New Roman", 1, 14)); // NOI18N
btn_show.setText("Show");
lbl_hobbies.setFont(new java.awt.Font("Times New Roman", 1, 14));
lbl_hobbies.setText("Hobbies");
lbl_gender.setFont(new java.awt.Font("Times New Roman", 1, 14));
lbl_gender.setText("Gender");
javax.swing.GroupLayout jPanel1Layout = new javax.swing.GroupLayout(jPanel1);
jPanel1.setLayout(jPanel1Layout);
jPanel1Layout.setHorizontalGroup(
jPanel1Layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING)
.addGroup(jPanel1Layout.createSequentialGroup()
.addContainerGap()
.addGroup(jPanel1Layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING)
.addComponent(lbl_gender)
.addComponent(lbl_name)
.addComponent(lbl_hobbies)
.addComponent(btn_show))
.addGap(30, 30, 30)
.addGroup(jPanel1Layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING)
.addGroup(jPanel1Layout.createSequentialGroup()
.addGroup(jPanel1Layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING)
.addComponent(cb_cricket)
.addComponent(cb_football)
.addComponent(cb_tennis))
.addGap(103, 103, 103))
.addGroup(jPanel1Layout.createSequentialGroup()
.addPreferredGap(javax.swing.LayoutStyle.ComponentPlacement.RELATED)
.addComponent(rb_male)
.addPreferredGap(javax.swing.LayoutStyle.ComponentPlacement.RELATED)
.addComponent(rb_female))
.addComponent(txt_name, javax.swing.GroupLayout.DEFAULT_SIZE, 277, Short.MAX_VALUE)
.addComponent(jScrollPane1, javax.swing.GroupLayout.PREFERRED_SIZE, 277, javax.swing.GroupLayout.PREFERRED_SIZE))
.addContainerGap())
);
jPanel1Layout.setVerticalGroup(
jPanel1Layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING)
.addGroup(jPanel1Layout.createSequentialGroup()
.addContainerGap()
.addGroup(jPanel1Layout.createParallelGroup(javax.swing.GroupLayout.Alignment.BASELINE)
.addComponent(lbl_name)
.addComponent(txt_name, javax.swing.GroupLayout.PREFERRED_SIZE, javax.swing.GroupLayout.DEFAULT_SIZE, javax.swing.GroupLayout.PREFERRED_SIZE))
.addGap(32, 32, 32)
.addGroup(jPanel1Layout.createParallelGroup(javax.swing.GroupLayout.Alignment.BASELINE)
.addComponent(lbl_gender)
.addComponent(rb_female)
.addComponent(rb_male))
.addGap(35, 35, 35)
.addGroup(jPanel1Layout.createParallelGroup(javax.swing.GroupLayout.Alignment.BASELINE)
.addComponent(lbl_hobbies)
.addComponent(cb_cricket))
.addGroup(jPanel1Layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING)
.addGroup(jPanel1Layout.createSequentialGroup()
.addPreferredGap(javax.swing.LayoutStyle.ComponentPlacement.RELATED)
.addComponent(cb_football)
.addPreferredGap(javax.swing.LayoutStyle.ComponentPlacement.RELATED)
.addComponent(cb_tennis)
.addGap(18, 18, 18)
.addComponent(jScrollPane1, javax.swing.GroupLayout.PREFERRED_SIZE, javax.swing.GroupLayout.DEFAULT_SIZE, javax.swing.GroupLayout.PREFERRED_SIZE))
.addGroup(jPanel1Layout.createSequentialGroup()
.addGap(105, 105, 105)
.addComponent(btn_show)))
.addContainerGap())
);
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(38, 38, 38)
.addComponent(jPanel1, javax.swing.GroupLayout.PREFERRED_SIZE, javax.swing.GroupLayout.DEFAULT_SIZE, Short.MAX_VALUE)
.addGap(57, 57, 57))
);
layout.setVerticalGroup(
layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING)
.addGroup(layout.createSequentialGroup()
.addGap(19, 19, 19)
.addComponent(jPanel1, javax.swing.GroupLayout.PREFERRED_SIZE, javax.swing.GroupLayout.DEFAULT_SIZE, Short.MAX_VALUE)
.addGap(23, 23, 23))
);
pack();
}// </editor-fold>
public void initListener()
{
ActionListener al=new ActionListener()
{
String name;
String gender;
String hobbies[] = new String[10];
String data1;
String data2;
String data3;
int i=-1;
String show;
public void actionPerformed(ActionEvent e)
{
name = txt_name.getText();
data1="Name is "+name+". ";
//*************************************
if (rb_male.isSelected())
{
gender = "Male";
}
else if (rb_female.isSelected())
{
gender = "Female";
}
data2="Gender "+gender+". ";
if(gender.equals("Male"))
{
data3="He likes ";
}
else
{
data3="She likes ";
}
//*************************************
String b = "";
if (cb_cricket.isSelected())
{
hobbies[i++] = "Cricket";
}
if (cb_football.isSelected())
{
hobbies[i++] = "Football";
}
if (cb_tennis.isSelected())
{
hobbies[i++] = "Tennis";
}
System.out.println("iSelected= " + i);
if (i == -1)
{
b = " nothing";
}
else
{
for (int j = 0; j < i; j++)
{
if (i > 0)
{
if (j < i - 2)
{
b = b + hobbies[j] + ", ";
}
else if (j == i - 2)
{
b = b + hobbies[j] + " and ";
}
else
{
b = b + hobbies[j] + ".";
}
}
else if (i == 0)
{
b = b + hobbies[j] + " only";
}
}
}
show=data1+data2+data3+b;
ta_show.setText(show);
//*************************************
//*************************************
// ta_show.setText(data1+data2+b);
}
};
btn_show.addActionListener(al);
}
/**
* @param args the command line arguments
*/
public static void main(String args[]) {
java.awt.EventQueue.invokeLater(new Runnable() {
public void run() {
new Register().setVisible(true);
}
});
}
// Variables declaration - do not modify
private javax.swing.ButtonGroup bg;
private javax.swing.JButton btn_show;
private javax.swing.ButtonGroup buttonGroup2;
private javax.swing.JCheckBox cb_cricket;
private javax.swing.JCheckBox cb_football;
private javax.swing.JCheckBox cb_tennis;
private javax.swing.JPanel jPanel1;
private javax.swing.JScrollPane jScrollPane1;
private javax.swing.JLabel lbl_gender;
private javax.swing.JLabel lbl_hobbies;
private javax.swing.JLabel lbl_name;
private javax.swing.JRadioButton rb_female;
private javax.swing.JRadioButton rb_male;
private javax.swing.JTextArea ta_show;
private javax.swing.JTextField txt_name;
// End of variables declaration
}
String b = "";
if (cb_cricket.isSelected())
{
hobbies[i++] = "Cricket";
}
if (cb_football.isSelected())
{
hobbies[i++] = "Football";
}
if (cb_tennis.isSelected())
{
hobbies[i++] = "Tennis";
}
System.out.println("iSelected= " + i);
if (i == -1)
{
b = " nothing";
}
else
{
for (int j = 0; j < i; j++)
{
if (i > 0)
{
if (j < i - 2)
{
b = b + hobbies[j] + ", ";
}
else if (j == i - 2)
{
b = b + hobbies[j] + " and ";
}
else
{
b = b + hobbies[j] + ".";
}
}
else if (i == 0)
{
b = b + hobbies[j] + " only";
}
}
}
show=data1+data2+data3+b;
ta_show.setText(show);
问题比我想象的要多，你指的是边界外的数组索引。如果是这种情况，请尝试使用 爱好[++i]=板球； 爱好[++i]=足球； 爱好[++i]=网球 而不是i++。使用值-1初始化变量i 使用i++时，i的值在命令执行后递增。如果使用++i，则该值在命令执行之前递增
正如我前面提到的，还有比这个问题更多的问题。不是运行时错误，但即使在进行了此更改++i之后，您也无法获得所需的输出。存在多个问题 首先，应预先选择其中一个性别。如果不存在NullPointerException，则会得到一个NullPointerException 对于ArrayIndexOutOfBoundsException，我建议使用一个列表：
LinkedList<String> hobbies = new LinkedList<String>();
//...
hobbies.clear();
if (cb_cricket.isSelected())
{
hobbies.add("Cricket");
}
if (cb_football.isSelected())
{
hobbies.add("Football");
}
if (cb_tennis.isSelected())
{
hobbies.add("Tennis");
}
if (hobbies.size() == 0)
{
b = " nothing";
}
else
{
for (int j = 0; j < hobbies.size(); j++)
{
if( j > 0)
{
if(j == hobbies.size()-1)
{
b += " and ";
}
else
{
b += ", ";
}
}
b+= hobbies.get(j);
}
if (hobbies.size() == 1)
{
b += " only";
}
b += ".";
}
用StringBuilder替换b的额外积分 详细说明“一些错误”是的，详细说明错误是什么。关于你正在努力实现的目标的一些信息将非常有用。目前这是一个巨大的代码转储，将获得很少或没有响应。请复制整个代码并run@SymonKt最好解释什么是“某些错误”，而不是让其他人运行代码。主要是因为回答问题不给我们报酬是不礼貌的，但也有可能是因为人们不在他们的工作/开发机器前。请参阅。是的，先生正确，但如果选择了cricket，则如上所述使用此选项，然后再次取消选择选定的cricket，即i值为increment@SymonKt你是说爱好列表中缺少的“，”我改正了。但是这个网站不是为你写代码的。@SymonKt如果这个答案对你有帮助的话，如果你接受它就好了。