java基础之多线程的练习题

题目如下：

某公司组织年会,会议入场时有两个入口,在入场时每位员工都能获取一张双色球彩票,假设公司有100个员工,利用多线程模拟年会入场过程,
并分别统计每个入口入场的人数,以及每个员工拿到的彩票的号码。线程运行后打印格式如下：
编号为: 2 的员工 从后门 入场! 拿到的双色球彩票号码是: [17, 24, 29, 30, 31, 32, 07]
编号为: 1 的员工 从前门 入场! 拿到的双色球彩票号码是: [06, 11, 14, 22, 29, 32, 15]
//.....
从后门入场的员工总共: 13 位员工
从前门入场的员工总共: 87 位员工

代码如下：

员工类，继承与Runnable接口，并且实现run方法

public class employer implements Runnable {private static int count = 100;private static int back=0;private static int front=0;public static int getCount() {return count;}public static void setCount(int count) {employer.count = count;}public static int getBack() {return back;}public static void setBack(int back) {employer.back = back;}public static int getFront() {return front;}public static void setFront(int front) {employer.front = front;}@Overridepublic void run() {while (count > 1) {synchronized (this) {if("前门".equals(Thread.currentThread().getName())){front++;}else if("后门".equals(Thread.currentThread().getName())){back++;}System.out.println("第"+count--+"名员工，从"+//Thread.currentThread().getName()+"出，取出的双色球的号码为："+Lottery.getResult());try {Thread.sleep(1);} catch (InterruptedException e) {// TODO Auto-generated catch blocke.printStackTrace();}}}}}

双色球生成类，生成红蓝两种颜色的球。

import java.util.Arrays;import java.util.Random;/** *  * 彩票生产类 */public class Lottery {private static String[] redpool = {"01", "02", "03", "04", "05", "06", "07", "08", "09", //"10", "11", "12", "13", "14", "15", "16", "17", "18", "19", "20", "21", "22",//"23", "24", "25", "26", "27", "28", "29", "30", "31", "32", "33"};private static String[] bluepool = {"01", "02", "03", "04", "05", "06", "07",//"08", "09", "10", "11", "12", "13", "14", "15", "16"};public  static String [] resultball=null;public Lottery() { // 红球 1-33取出6个 // 兰球1-16 取一个 // 随机生成一组双色球号码： // String[] redpool ={"01","02","03"};//getball(redpool, bluepool);}public static String[] getball(String[] red, String[] blue) {Random x = new Random();resultball=new String[7];String[] strred = new String[6];// 存储红色String strblue = "";// 存储蓝色int index = 0;// 游标for (int i = 0; i < strred.length; i++) {index = x.nextInt(33);//set random seedsstrred[i] = red[index];//for (int j = 0; j < i; j++) {if (strred[j] == red[index]) {//System.out.println("double:" + red[index] + " delete");i--;break;}}}int index2 = x.nextInt(16);strblue = blue[index2];//System.out.print("红色球为" + Arrays.toString(strred));//System.out.println("蓝色球为" + strblue);//resultball=strred;System.arraycopy(strred,0,resultball,0,6);resultball[resultball.length-1]=strblue;//System.out.println("双色球抽奖结果为："+Arrays.toString(resultball));return resultball;}public static String getResult(){return Arrays.toString(getball(redpool, bluepool));}public static void main(String[] args) {//System.out.println(Arrays.toString(getball(redpool, bluepool)));}}

测试类：

public class XMain {public static void main(String[] args) {employer my = new employer();Thread t1 = new Thread(my, "前门");Thread t2 = new Thread(my, "后门");t1.start();// 同一个mt，但是在Thread中就不可以，如果用同一个实例化对象mt，就会出现异常// new Thread(my, "E").start();t2.start();if (t1.isAlive()||t2.isAlive()) {try {Thread.sleep(500);} catch (InterruptedException e) {// TODO Auto-generated catch blocke.printStackTrace();}}System.out.println("前门总计:"+employer.getFront()+"人\t后门总计:"+employer.getBack()+"人\t总计："+(100-employer.getCount())+"人");}}