提问一个关于JRadioButton的使用问题。

Question

我想问：
1.它的布局不好，怎么调整都是分两列的，我怎么把它调成一列。
2.RadioButton的响应还有其他更好的方法吗？谢谢。

Answer 1

你采用GridLayout试一试,10*1的网格

Answer 2

噢。
还有如何将TextField的接收字符位数限制再“1”位。
谢谢。

Answer 3

import javax.swing.*;
import java.awt.*;/**这个是主程序
 * @author      Fan
 * Date: 2003-5-24
 * Time: 20:40:13
 * Copyright(c) Since 2003 WisdomLeague
 */
public class SportLottery extends JFrame {    public SportLottery() {
        setTitle("SportLottery");
        setSize(10,300);
        setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
        SelectPanel sp;
        sp = new SelectPanel();
        setContentPane(sp);
        show();
    }
    public static void main(String[] arguments) {
        SportLottery sl;
        sl = new SportLottery();
    }    public Insets getInset() {
         return new Insets(10,10,10,10);
    }
}
import javax.swing.*;
import java.awt.event.ItemListener;
import java.awt.event.ActionEvent;
import java.awt.event.ItemEvent;
import java.awt.event.ActionListener;
import java.awt.*;/**
 * User: Fan's
 * Date: 2003-5-24
 * Time: 21:26:00
 * Copyright(c) Since 2003 WisdomLeague
 */
public class SelectPanel extends JPanel implements ItemListener,ActionListener {
    JRadioButton[] teams = new JRadioButton[10];
    JTextField NumOneText = new JTextField(2);    public SelectPanel() {
        ButtonGroup group;
        group = new ButtonGroup();
        GridLayout lm = new GridLayout(11,1,1,1);
        setLayout(lm);        NumOneText.addActionListener(this);
        NumOneText.setColumns(1);
        add(NumOneText);        teams[0] = new JRadioButton("0",true);
        teams[1] = new JRadioButton("1");
        teams[2] = new JRadioButton("2");
        teams[3] = new JRadioButton("3");
        teams[4] = new JRadioButton("4");
        teams[5] = new JRadioButton("5");
        teams[6] = new JRadioButton("6");
        teams[7] = new JRadioButton("7");
        teams[8] = new JRadioButton("8");
        teams[9] = new JRadioButton("9");        int i;
        for (i = 0; i < teams.length; i++) {
            teams[i].addItemListener(this);
            group.add(teams[i]);
            add(teams[i]);
        }
    }    public void itemStateChanged(ItemEvent e) {
         Object source;
         source = e.getSource();
         for (int j = 0; j < teams.length; j++) {
             if (source == teams[j]) {
                 NumOneText.setText(teams[j].getText());
             }
         }
         repaint();
    }    public void actionPerformed(ActionEvent e) {
        Object source;
        source = e.getSource();
        if (source == NumOneText) {
            int k = Integer.parseInt(NumOneText.getText());
            if (k <= 9) {
                teams[k].setSelected(true);
            }
        }
    }}//JTextField的响应要回车以后才生效，问还有其他类型的响应让一输入数字就开始响应。谢谢。

Answer 4

import javax.swing.*;
import java.awt.*;/**这个是主程序
 * Author      Fan
 * Date: 2003-5-24
 * Time: 20:40:13
 * Copyright(c) Since 2003 WisdomLeague
 */
public class SportLottery extends JFrame {        SelectNumPanel sp1 = new SelectNumPanel(10);
        SelectNumPanel sp2 = new SelectNumPanel(10);
        SelectNumPanel sp3 = new SelectNumPanel(10);
        SelectNumPanel sp4 = new SelectNumPanel(10);
        SelectNumPanel sp5 = new SelectNumPanel(10);
        SelectNumPanel sp6 = new SelectNumPanel(10);
        SelectNumPanel sp7 = new SelectNumPanel(8);
        ButtonPanel bp = new ButtonPanel();    public SportLottery() {
        setTitle("SportLottery");
        setSize(360,250);
        setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
        JPanel pane = new JPanel();
        GridLayout gl = new GridLayout(1,8,1,1);
        pane.setLayout(gl);
        pane.add(sp1);
        pane.add(sp2);
        pane.add(sp3);
        pane.add(sp4);
        pane.add(sp5);
        pane.add(sp6);
        pane.add(sp7);
        pane.add(bp);
        setContentPane(pane);
        show();
    }
    public static void main(String[] arguments) {
        SportLottery sl;
        sl = new SportLottery();
    }    public Insets getInset() {
         return new Insets(10,10,10,10);
    }
}
import javax.swing.*;
import java.awt.event.*;
import java.awt.*;/**
 *Author      Fan
 * Date: 2003-5-27
 * Time: 16:15:08
 * Copyright(c) Since 2003 WisdomLeague
 */
public class SelectNumPanel extends JPanel implements ItemListener ,ActionListener,FocusListener {    JRadioButton[] teams;
    JTextField NumText = new JTextField(1);
    JComboBox Num = new JComboBox();
    int l;    public SelectNumPanel(int columns) {
        ButtonGroup group;
        group = new ButtonGroup();
        GridLayout lm = new GridLayout(columns+2,1,1,1);
        setLayout(lm);        NumText.addFocusListener(this);
        NumText.setColumns(1);
        add(NumText);        teams = new JRadioButton[columns];        int i;
        for (i = 0; i < teams.length ;i++) {
            teams[i] = new JRadioButton(Integer.toString(i));
            teams[i].addItemListener(this);
            group.add(teams[i]);
            add(teams[i]);
        }
    }    public void itemStateChanged(ItemEvent e) {
        Object source;
        source = e.getSource();
        for (int j= 0; j<teams.length; j++) {
            if(source == teams[j]) {
                NumText.setText(teams[j].getText());
            }
        }
        repaint(0);
    }    public void actionPerformed(ActionEvent e) {
    }    public void focusGained(FocusEvent e) {    }    public void focusLost(FocusEvent e) {
        Object source;
        source = e.getSource();
        if (source == NumText) {
            l = Integer.parseInt(NumText.getText());           //**
            if (l <= 9 ) {
                teams[l].setSelected(true);
            }
        }
    }    public Insets getInset() {
         return new Insets(10,10,0,0);
    }
}import javax.swing.*;
import java.awt.*;/**
 * Author   Fan
 * Date: 2003-5-28
 * Time: 16:05:56
 * Copyright(c) Since 2003 WisdomLeague.
 */
public class ButtonPanel extends JPanel {
    JButton Random = new JButton("Random");    public ButtonPanel () {
        setSize(300,45);
        setLayout(new BorderLayout());
        add(Random, BorderLayout.NORTH);
    }     public Insets getInset() {
         return new Insets(10,10,0,0);
    }
}
//这个程序可以运行，但是一点JRadioButton就出现很多警告。

Answer 5

C:\j2sdk141\bin\javaw.exe -classpath C:\j2sdk141\jre\lib\charsets.jar;C:\j2sdk141\jre\lib\jaws.jar;C:\j2sdk141\jre\lib\jce.jar;C:\j2sdk141\jre\lib\jsse.jar;C:\j2sdk141\jre\lib\rt.jar;C:\j2sdk141\jre\lib\sunrsasign.jar;C:\j2sdk141\jre\lib\ext\dnsns.jar;C:\j2sdk141\jre\lib\ext\ldapsec.jar;C:\j2sdk141\jre\lib\ext\localedata.jar;C:\j2sdk141\jre\lib\ext\sunjce_provider.jar;C:\Documents and Settings\fan\IdeaProjects\Lottery\src;C:\j2sdk141 SportLottery
java.lang.NumberFormatException: For input string: ""
at java.lang.NumberFormatException.forInputString(NumberFormatException.java:48)
at java.lang.Integer.parseInt(Integer.java:447)
at java.lang.Integer.parseInt(Integer.java:476)
at SelectNumPanel.focusLost(SelectNumPanel.java:62)
at java.awt.AWTEventMulticaster.focusLost(AWTEventMulticaster.java:168)
at java.awt.Component.processFocusEvent(Component.java:4999)
at java.awt.Component.processEvent(Component.java:4881)
at java.awt.Container.processEvent(Container.java:1566)
at java.awt.Component.dispatchEventImpl(Component.java:3598)
at java.awt.Container.dispatchEventImpl(Container.java:1623)
at java.awt.Component.dispatchEvent(Component.java:3439)
at java.awt.KeyboardFocusManager.redispatchEvent(KeyboardFocusManager.java:1688)
at java.awt.DefaultKeyboardFocusManager.typeAheadAssertions(DefaultKeyboardFocusManager.java:734)
at java.awt.DefaultKeyboardFocusManager.dispatchEvent(DefaultKeyboardFocusManager.java:467)
at java.awt.Component.dispatchEventImpl(Component.java:3468)
at java.awt.Container.dispatchEventImpl(Container.java:1623)
at java.awt.Component.dispatchEvent(Component.java:3439)
at java.awt.EventQueue.dispatchEvent(EventQueue.java:450)
at java.awt.EventDispatchThread.pumpOneEventForHierarchy(EventDispatchThread.java:197)
at java.awt.EventDispatchThread.pumpEventsForHierarchy(EventDispatchThread.java:150)
at java.awt.EventDispatchThread.pumpEvents(EventDispatchThread.java:144)
at java.awt.EventDispatchThread.pumpEvents(EventDispatchThread.java:136)
at java.awt.EventDispatchThread.run(EventDispatchThread.java:99)用IntelliJ Idea 3.0.4做的，提示得错误好像都是SelectNumPanel中“**”那一行的。

Answer 6

你把"**"上面的一行改为：
if (source == NumText && !NumText.getText().trim().equals("")) {