这是我的代码，我希望输出如下，但有一些错误
--- ----输出
姓名Arun.Gender男。他什么都不喜欢。
姓名Arun.Gender男。他只喜欢Cricket
姓名Arun.Gender男。他喜欢板球和网球。
姓名Arun.Gender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.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
}
此代码的错误部分是
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);
答案 0 :(得分：0)
存在的问题多于（我猜你的意思）ArrayIndexOutOfBounds。如果是这种情况，请尝试使用
hobbies[++i] = "Cricket";
hobbies[++i] = "Football";
hobbies[++i] = "Tennis";
而不是i ++。使用值 -1 初始化变量 i 使用 i ++ 时，执行命令后 i 的值会递增。如果使用 ++ i ，则在命令执行之前递增值。
正如我之前提到的，还有比这更多的问题。不是运行时错误，但即使在此更改（++ i）之后，您也无法获得所需的输出。
答案 1 :(得分：0)
那里有很多问题。
首先应该预先选择其中一个性别。如果没有，则会得到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 += ".";
}
使用LinkedList可以获得更好的可扩展结果。
使用StringBuilder替换b的加分点。