按照你的要求编写的红绿灯程序，你看看吧，比较简单。
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完整的程序如下：
import java.awt.*;
import java.awt.event.*;
import javax.swing.*;
import java.awt.Graphics;
public class TrafficLight extends JFrame{
JRadioButton jrbYellow,jrbGreen,jrbRed;
int flag=0;
jpNewPanel jpNewPanel;
public static void main(String[] args){
TrafficLight frame=new TrafficLight();
frame.setSize(500,200);
frame.setLocationRelativeTo(null);
frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
frame.setTitle("TrafficLight");
frame.setVisible(true);
}
public TrafficLight(){
jpNewPanel=new jpNewPanel();
add(jpNewPanel,BorderLayout.CENTER);
JPanel jpRadioButtons=new JPanel();
jpRadioButtons.setLayout(new GridLayout(1,3));
jpRadioButtons.add(jrbYellow=new JRadioButton("Yellow"));
jpRadioButtons.add(jrbGreen=new JRadioButton("Green"));
jpRadioButtons.add(jrbRed=new JRadioButton("Red"));
add(jpRadioButtons,BorderLayout.SOUTH);
ButtonGroup group=new ButtonGroup();
group.add(jrbYellow);
group.add(jrbGreen);
group.add(jrbRed);
jrbYellow.addActionListener(new ActionListener(){
public void actionPerformed(ActionEvent e){
flag=2;
jpNewPanel.repaint();
}
});
jrbGreen.addActionListener(new ActionListener(){
public void actionPerformed(ActionEvent e){
flag=1;
jpNewPanel.repaint();
}
});
jrbRed.addActionListener(new ActionListener(){
public void actionPerformed(ActionEvent e){
flag=3;
jpNewPanel.repaint();
}
});
}
class jpNewPanel extends JPanel{
protected void paintComponent(Graphics g){
super.paintComponent(g);
g.drawRect(0,0,40,100);
g.drawOval(10,10,20,20);
g.drawOval(10,40,20,20);
g.drawOval(10,70,20,20);
if(flag==1){
g.setColor(Color.GREEN);
g.fillOval(10, 70, 20, 20);
}
else if(flag==2){
g.setColor(Color.YELLOW);
g.fillOval(10, 40, 20, 20);
}
else if(flag==3){
g.setColor(Color.RED);
g.fillOval(10, 10, 20, 20);
}
}
}
}
建议用eclipse工具，这样的一个类，用工具很快就生成了。
public
class
light
{
private
int
watts;
private
boolean
indicator;
/**
*
@param
watts
*
:创建具有watts瓦的对象
*/
public
light(int
watts)
{
this.watts
=
watts;
}
/**
*
@param
watts
*
:创建具有watts瓦的对象
*
*
@param
indicator
*
:创建具有watts瓦，开关状态
为indicator的对象
*/
public
light(int
watts,
boolean
indicator)
{
super();
this.watts
=
watts;
this.indicator
=
indicator;
}
/**
*
开灯，即灯的状态置为开
*/
public
void
swithoh()
{
this.indicator
=
true;
}
/**
*
关灯
*/
public
void
printlnoff()
{
this.indicator
=
false;
}
/**
*
输出灯的瓦数信息和开灯的状态·
*/
public
void
printlnfo()
{
system.out.println("灯的瓦数是："
+
this.watts
+
"\n开关状态是："
+
this.indicator);
}
}
模拟了一下。。设置成B1按下时B4弹起，B4按下时B1弹起，不然有的时候电源是开是关不好判定。。如果B1/B4是一个按钮就好了 = =。为方便观察，间隔时间设为0.5s。另外加了两个按钮用来控制灯泡1、2是否故障。import java.awt.*;
import java.awt.event.*;
import javax.swing.*;class Bulb extends JFrame
{ private final int INTER_SECOND = 500; // 间隔时间 private BulbButton b1 = new BulbButton("B1");
private BulbButton b2 = new BulbButton("B2");
private BulbButton b3 = new BulbButton("B3");
private BulbButton b4 = new BulbButton("B4"); private BulbLight l1 = new BulbLight(1);
private BulbLight l2 = new BulbLight(2); private JButton bb1 = new BuldStateButton(l1);
private JButton bb2 = new BuldStateButton(l2); private JLabel state = new JLabel("关闭"); private CheckLightThread thread; public Bulb() {
this.setTitle("灯泡模拟");
this.setSize(300, 200);
this.setLayout(new GridLayout(4, 1)); this.add(new JPanel() {
{
this.setLayout(new FlowLayout(FlowLayout.CENTER));
this.add(new JLabel("电源状态："));
this.add(state);
}
}); this.add(new JPanel() {
{
this.setLayout(new FlowLayout(FlowLayout.CENTER));
this.add(l1);
this.add(l2);
}
}); this.add(new JPanel() {
{
this.setLayout(new FlowLayout(FlowLayout.CENTER));
this.add(b1);
this.add(b2);
this.add(b3);
this.add(b4);
}
}); this.add(new JPanel() {
{
this.setLayout(new FlowLayout(FlowLayout.CENTER));
this.add(bb1);
this.add(bb2);
}
}); setButtons(); this.setVisible(true);
} private void setButtons() {
b2.setEnabled(false);
b3.setEnabled(false);
b4.setSelected(true); b1.addActionListener(new ActionListener() {
public void actionPerformed(ActionEvent e) {
b1.changeState();
if(b1.isSelected()) {
b4.setSelected(false);
b2.setEnabled(true);
b3.setEnabled(true);
} else {
b2.setSelected(false);
b3.setSelected(false);
b4.setSelected(true);
b2.setEnabled(false);
b3.setEnabled(false);
}
changeSystemState();
}
}); b2.addActionListener(new ActionListener() {
public void actionPerformed(ActionEvent e) {
if(!b1.isSelected() b4.isSelected()) return; // 在电源关闭状态下，B2和B3按钮不起作用
b2.changeState();
if(b2.getCount() b3.getCount()) { // 如果B2被按下的次数比B3被按下的次数多，L1亮
l1.change(true);
l2.change(false);
}
}
}); b3.addActionListener(new ActionListener() {
public void actionPerformed(ActionEvent e) {
if(!b1.isSelected() b4.isSelected()) return; // 在电源关闭状态下，B2和B3按钮不起作用
b3.changeState();
if(b3.getCount() = b2.getCount()) { // 如果B2被按下的次数比B3被按下的次数少，L2亮
l1.change(false);
l2.change(true);
}
}
}); b4.addActionListener(new ActionListener() {
public void actionPerformed(ActionEvent e) {
b4.changeState();
if(b4.isSelected()) {
b1.setSelected(false);
b2.setSelected(false);
b3.setSelected(false);
b2.setEnabled(false);
b3.setEnabled(false);
} else {
b1.setSelected(true);
b2.setEnabled(true);
b3.setEnabled(true);
}
changeSystemState();
}
});
} private void changeSystemState() {
if(!b1.isSelected() b4.isSelected()) { // 在电源关闭状态下，灯应不亮
state.setText("关闭");
l1.change(false);
l2.change(false);
thread.pause();
}
if(b1.isSelected() !b4.isSelected()) { // 从最近一次电源打开状态算起
state.setText("开启");
b2.clearCount();
b3.clearCount();
thread = new CheckLightThread();
thread.start();
}
} public static void main(String[] args)
{
new Bulb();
} private class BulbButton extends JToggleButton
{
private int count = 0; public BulbButton(String text) {
super(text);
} public void changeState() {
if(isSelected()) {
++count;
}
} public void clearCount() {
count = 0;
} public int getCount() {
return count;
} } private class BulbLight extends JPanel
{ private int id; private boolean bad; private boolean lightState; private JLabel label; private JLabel state = new JLabel("【暗】"); private JLabel state2 = new JLabel("-正常"); public BulbLight(int id) {
this.id = id;
label = new JLabel("灯泡" + id);
this.add(label);
this.add(state);
this.add(state2);
} public int getId() {
return id;
} public void light() {
this.state.setText("【" + ("【暗】".equals(this.state.getText())?"亮":"暗") + "】");
} public void change(boolean light) {
if(bad)return;
lightState = light;
this.state.setText("【" + (lightState?"亮":"暗") + "】");
} public boolean isBad() {
return bad;
} public void setState(boolean bad) {
this.bad = bad;
state2.setText((bad?"-故障":"-正常"));
if(bad) {
this.state.setText("【暗】");
} else {
this.state.setText("【" + (lightState?"亮":"暗") + "】");
}
} } private class BuldStateButton extends JButton implements ActionListener
{
private BulbLight light; public BuldStateButton(BulbLight light) {
super("破坏灯泡" + light.getId());
this.light = light;
this.addActionListener(this);
} public void actionPerformed(ActionEvent e) {
if(("破坏灯泡" + light.getId()).equals(this.getActionCommand())) {
this.setText("修复灯泡" + light.getId());
light.setState(true);
}
else {
this.setText("破坏灯泡" + light.getId());
light.setState(false);
}
}
} private class CheckLightThread extends Thread
{ private boolean runFlag = true; public void pause() {
this.runFlag = false;
} public void run() {
while(runFlag) {
try
{
if (l1.isBad() !l2.isBad())
{
l2.light();
}
if (!l1.isBad() l2.isBad())
{
l1.light();
}
sleep(INTER_SECOND);
} catch (Exception e) {
System.out.println(e.getMessage());
}
}
}
}
}截图如下：
public class Light {
boolean state;//灯的当前状态,false为关，true为开
int brightness;//灯的亮度，数值为0~100
/*初始化灯为关闭状态，亮度为0*/
public Light()
{
this.state=false;
this.brightness=0;
}
/*开关方法*/
public void turn()
{
if(this.state==true)
this.state=false;
else this.state=true;
}
/*获取状态方法*/
public boolean getState() {
return state;
}
/*获取灯泡亮度*/
public int getBrightness() {
return brightness;
}
/*调解灯泡亮度*/
public void setBrightness(int bn) {
if(this.state==true)//判断灯泡状态
if(bn=0bn=100) {//判断亮度调节值是不是合法
this.brightness = bn;
if(bn==0)//判断亮度是不是调到0
this.state=false;
}
}
public static void main(String[] args)
{
Light light=new Light();
light.turn();
System.out.println("当前灯泡状态:"+light.getState());
light.setBrightness(0);
System.out.println("当前灯泡亮度:"+light.getBrightness());
System.out.println("当前灯泡状态:"+light.getState());
light.setBrightness(10);
System.out.println("当前灯泡亮度:"+light.getBrightness());
System.out.println("当前灯泡状态:"+light.getState());
light.turn();
System.out.println("当前灯泡状态:"+light.getState());
light.setBrightness(10);
System.out.println("当前灯泡亮度:"+light.getBrightness());
System.out.println("当前灯泡状态:"+light.getState());
}
}
我建议你学习一下面向对象编程的思想方法
