用java編寫(xiě)交通信號(hào)燈

按照你的要求編寫(xiě)的紅綠燈程序，你看看吧，比較簡(jiǎn)單。

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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);

}

}

}

}

求一個(gè)簡(jiǎn)易的JAVA程序---紅綠燈，有兩個(gè)部分，用下拉表控制燈的顏色，選擇紅，畫(huà)布中的燈就變紅的那種

按照你的要求，寫(xiě)出的程序如下：

import java.awt.BorderLayout;

import java.awt.Color;

import java.awt.Graphics;

import java.awt.event.ItemEvent;

import java.awt.event.ItemListener;

import javax.swing.JComboBox;

import javax.swing.JFrame;

import javax.swing.JPanel;

public class TrafficLight {

JFrame jf=new JFrame("Traffic Light");

JPanel jp=new JPanel();

JComboBox jcb=new JComboBox();

public TrafficLight(){

jcb.addItem("紅燈");

jcb.addItem("黃燈");

jcb.addItem("綠燈");

jcb.addItemListener(new JComboBoxListener());

jf.add(jcb,BorderLayout.NORTH);

jf.add(jp,BorderLayout.CENTER);

jf.setSize(400,400);

jf.setVisible(true);

jf.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);

}

public static void main(String[] args) {

// TODO Auto-generated method stub

new TrafficLight();

}

class JComboBoxListener implements ItemListener{

@Override

public void itemStateChanged(ItemEvent ie) {

Graphics g=jf.getGraphics();

if(ie.getItem().equals("紅燈")){

g.setColor(Color.RED);

g.fillOval(200, 200, 100, 100);

}else if(ie.getItem().equals("黃燈")){

g.setColor(Color.YELLOW);

g.fillOval(200, 200, 100, 100);

}else if (ie.getItem().equals("綠燈")){

g.setColor(Color.GREEN);

g.fillOval(200, 200, 100, 100);

}

}

}

}

求Java大神幫我看一下這個(gè)紅綠燈的代碼，很短

樓主，怎么說(shuō)你 呢？粗心把

仔細(xì)看看 是不是類(lèi)中有類(lèi)，把那個(gè)窗口類(lèi)放到外面~~

還有，貌似你的制圖也是有問(wèn)題的~~~

java 紅綠燈 代碼

//按回車(chē)鍵就可以

import java.awt.event.KeyAdapter;

import java.awt.event.KeyEvent;

import javax.swing.JFrame;

import javax.swing.JLabel;

public class Print {

public static void main(String[] args) {

JFrame jFrame = new JFrame ();

final JLabel jLabel = new JLabel ("按回車(chē)鍵！");

jFrame.setLayout(null);

jLabel.setBounds(80,50,500,80);

jFrame.add(jLabel);

jFrame.setSize(200, 200);

jFrame.setLocation(200, 300);

jFrame.setVisible(true);

jFrame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);

jFrame.addKeyListener(new KeyAdapter () {

int n = 0;

public void keyPressed(KeyEvent e) {

int keyCode = e.getKeyCode();

if (keyCode == KeyEvent.VK_ENTER) {

n++;

if (n == 1)

jLabel.setText("綠");

else if (n == 2) {

jLabel.setText("紅");

} else if (n == 3) {

jLabel.setText("黃");

n = 0;

}

}

}

});

}

}

Java紅綠燈 求大神?。〖卑?/h2>

import?java.awt.Color;

import?java.awt.Container;

import?java.awt.Dimension;

import?java.awt.FlowLayout;

import?java.awt.Graphics;

import?java.awt.event.ActionEvent;

import?java.awt.event.ActionListener;

import?javax.swing.JButton;

import?javax.swing.JFrame;

import?javax.swing.JPanel;

public?class?Way?extends?JPanel?{

JButton?red;

public?Way()?{

red=?new?JButton("換燈");

setBackground(Color.yellow);

setSize(new?Dimension(320,?260));

setPreferredSize(new?Dimension(320,?260)?);

JPanel?btnPanel?=?new?JPanel();

btnPanel.setLayout(new?FlowLayout());

red.setLayout(new?FlowLayout());//?將單選按鈕加入按鈕面板

btnPanel.add(red);

add(red);

}

private?void?lightRed(Graphics?g)?{

g.setColor(Color.red);

g.fillOval(getWidth()?/?2,?30,?15,?15);

g.setColor(Color.black);

g.fillOval(getWidth()?/?2,?50,?15,?15);

g.fillOval(getWidth()?/?2,?70,?15,?15);

}

private?void?lightYellow(Graphics?g)?{

g.setColor(Color.yellow);

g.fillOval(getWidth()?/?2,?50,?15,?15);

g.setColor(Color.black);

g.fillOval(getWidth()?/?2,?30,?15,?15);

g.fillOval(getWidth()?/?2,?70,?15,?15);

}

private?void?lightGreen(Graphics?g)?{

g.setColor(Color.green);

g.fillOval(getWidth()?/?2,?70,?15,?15);

g.setColor(Color.black);

g.fillOval(getWidth()?/?2,?30,?15,?15);

g.fillOval(getWidth()?/?2,?50,?15,?15);

}

protected?void?paintComponent(Graphics?g)?{

super.paintComponents(g);

Way?a?=?new?Way();

g.clearRect(0,?0,?getWidth(),?getHeight());

g.drawRect(getWidth()?/?2,?30,?30,?80);

red.addActionListener(new?ActionListener()?{

int?f1?=?0;

public?void?actionPerformed(ActionEvent?e)?{

Graphics?g?=?getGraphics();

switch?(f1)?{

case?0:

a.lightRed(g);

break;

case?1:

a.lightYellow(g);

break;

case?2:

a.lightGreen(g);

break;

}

f1++;

if(f12)?f1=0;

};

});

}

public?static?void?main(String[]?args)?{

JFrame?fr?=?new?JFrame("郵件界面模擬");

fr.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);?//?點(diǎn)擊x結(jié)束程序

Container?contentPane?=?fr.getContentPane();

//?得到窗口內(nèi)容面板

contentPane.add(new?Way());

fr.pack();

fr.setVisible(true);?//?設(shè)置窗口可見(jiàn)

}

}大致幫你改了下，不知道符合不符合你的要求，有問(wèn)題請(qǐng)追問(wèn)

java 線程實(shí)現(xiàn)一個(gè)紅綠燈問(wèn)題

關(guān)鍵是啟動(dòng)一個(gè)線程控制顏色。代碼如下。

import java.applet.Applet;

import java.awt.Color;

import java.awt.Graphics;

import java.util.concurrent.Executors;

import java.util.concurrent.ScheduledExecutorService;

import java.util.concurrent.TimeUnit;

public class Signal extends Applet {

int width = 200, height = 240;

int w = 50, h = 50;

int x = (width - w) / 2, y1 = (height - h * 3) / 3, y2 = y1 + h, y3 = y2 + h;

Color c = Color.RED;

@Override

public void init() {

ScheduledExecutorService exec = Executors.newScheduledThreadPool(1);

exec.scheduleAtFixedRate(new Runnable() {

@Override

public void run() {

if (c == Color.RED) {

c = Color.YELLOW;

} else if (c == Color.YELLOW) {

c = Color.GREEN;

} else if (c == Color.GREEN) {

c = Color.RED;

}

repaint();

}

}, 5, 5, TimeUnit.SECONDS);

}

@Override

public void paint(Graphics g) {

setBackground(Color.white);

// all gray

g.setColor(Color.LIGHT_GRAY);

g.fillOval(x, y1, w, h);

g.fillOval(x, y2, w, h);

g.fillOval(x, y3, w, h);

if (c == Color.RED) {

g.setColor(Color.RED);

g.fillOval(x, y1, w, h);

} else if (c == Color.YELLOW) {

g.setColor(Color.YELLOW);

g.fillOval(x, y2, w, h);

} else if (c == Color.GREEN) {

g.setColor(Color.GREEN);

g.fillOval(x, y3, w, h);

}

}

}

文章名稱：紅綠燈java代碼 c語(yǔ)言紅綠燈代碼
標(biāo)題鏈接：http://chinadenli.net/article24/hgsjje.html

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