Java多線程並發管理，java多線程並發

Java多線程並發管理，java多線程並發

在書上看到了一個好方法，當多個線程並發時，可以用scheduleAtFixedRate來管理,scheduleAtFixedRate定時執行一次任務,是重複執行,而ScheduledThreadPoolExecutor將只執行一次任務，   如果你有多個任務，同時進行，並且，是定時的執行，那麼以下的程式，完全可以滿足你的要求： import java.util.concurrent.*;import java.util.*; public class TestGreenhouseScheduler {private volatile boolean light = false;private volatile boolean water = false;private String thermostat = "Day"; public synchronized String getThermostat() {return thermostat;} public synchronized void setThermostat(String value) {thermostat = value;}     //運行一次任務ScheduledThreadPoolExecutor scheduler = new ScheduledThreadPoolExecutor(10); public void schedule(Runnable event, long delay) {scheduler.schedule(event, delay, TimeUnit.MILLISECONDS);} public void repeat(Runnable event, long initialDelay, long period) {//scheduleAtFixedRate 定時執行一次任務,是重複執行scheduler.scheduleAtFixedRate(event, initialDelay, period,TimeUnit.MILLISECONDS);} class LightOn implements Runnable {int j=0;public void run() {// Put hardware control code here to// physically turn on the light.System.out.println("Turning on lights"+"執行了"+(j++));light = true;}} class LightOff implements Runnable {public void run() {// Put hardware control code here to// physically turn off the light.System.out.println("Turning off lights");light = false;}} class WaterOn implements Runnable {public void run() {// Put hardware control code here.System.out.println("Turning greenhouse water on");water = true;}} class WaterOff implements Runnable {public void run() {// Put hardware control code here.System.out.println("Turning greenhouse water off");water = false;}} class ThermostatNight implements Runnable {int j=0;public void run() {// Put hardware control code here.System.out.println("Thermostat to night setting"+"執行了"+(j++));setThermostat("Night");}} class ThermostatDay implements Runnable {public void run() {// Put hardware control code here.System.out.println("Thermostat to day setting");setThermostat("Day");}} class Bell implements Runnable {int j= 0;public void run() {System.out.println("Bing!"+"執行了"+(j++));}} class Terminate implements Runnable {public void run() {System.out.println("Terminating");scheduler.shutdownNow(); //結束線程// Must start a separate task to do this job,// since the scheduler has been shut down:new Thread() {public void run() {         //最後一次執行System.out.println("nowww");}}.start();}} public static void main(String[] args) {TestGreenhouseScheduler gh = new TestGreenhouseScheduler();gh.schedule(gh.new Terminate(), 1000*7); //7秒運行一次任務，這裡只執行一次 gh.repeat(gh.new Bell(), 0, 1000);//1秒執行一次任務,是重複執行gh.repeat(gh.new ThermostatNight(), 0, 2000);gh.repeat(gh.new LightOn(), 0, 3000);}}   ---結果7秒之後，結束所有的線程，你看Bing執行了7次--- Bing!執行了0Thermostat to night setting執行了0Turning on lights執行了0Bing!執行了1Thermostat to night setting執行了1Bing!執行了2Bing!執行了3Turning on lights執行了1Bing!執行了4Thermostat to night setting執行了2Bing!執行了5Bing!執行了6Thermostat to night setting執行了3Turning on lights執行了2TerminatingBing!執行了7nowww