Java多线程实验

多线程是比较抽象的一个概念，其实多线程是一种运筹，单线程就像一次只干一件事情，一件事情做完再去做接下来的另外一件事，比如先煮饭，等饭熟了再炒菜。而多线程则是饭还在煮着的同时就炒菜，然后饭菜差不多同时好了。这就是充分利用等待的空余时间去同时完成多项任务的一种运筹。

多线程中最重要的两个命令应该是start()和join()

start()就是开始一个线程，比如按下电饭煲的开关，开始做菜等。

join()就是等什么一齐好了，比如吃饭前要等饭和菜都好了才能开始吃饭。

所以大体就是这样：

Thread 做饭;

Thread 做菜;

做饭.start();

做菜.start();

做饭.join();

做菜.join();

吃饭;

package threadexperiment;

import java.util.ArrayList;
import java.util.logging.Level;
import java.util.logging.Logger;
import javafx.application.Application;
import javafx.event.ActionEvent;
import javafx.event.EventHandler;
import javafx.scene.Scene;
import javafx.scene.control.Button;
import javafx.scene.layout.StackPane;
import javafx.stage.Stage;

/**
*
* @author Administrator
*/
public class ThreadExperiment extends Application {

@Override
public void start(Stage primaryStage) {
Button btn = new Button();
btn.setText("多线程实验");
btn.setOnAction(new EventHandler<ActionEvent>() {

@Override
public void handle(ActionEvent event) {

dataInput.clear();
for(int i=0;i<100;i++){
dataInput.add(i);
}

dataOutput.clear();

//批量发动线程，百团大战
Thread thread0=new MyThread(0,9);
Thread thread1=new MyThread(10,19);
Thread thread2=new MyThread(20,29);
Thread thread3=new MyThread(30,39);
Thread thread4=new MyThread(40,49);
Thread thread5=new MyThread(50,59);
Thread thread6=new MyThread(60,69);
Thread thread7=new MyThread(70,79);
Thread thread8=new MyThread(80,89);
Thread thread9=new MyThread(90,99);

thread0.start();
thread1.start();
thread2.start();
thread3.start();
thread4.start();
thread5.start();
thread6.start();
thread7.start();
thread8.start();
thread9.start();

try {
//线程批量会师
thread0.join();
thread1.join();
thread2.join();
thread3.join();
thread4.join();
thread5.join();
thread6.join();
thread7.join();
thread8.join();
thread9.join();
} catch (InterruptedException ex) {
Logger.getLogger(ThreadExperiment.class.getName()).log(Level.SEVERE, null, ex);
}

System.out.println("所有线程胜利会师");

//线程批量会师后才会执行后续的程序，来个大阅兵检验

for(int i=0;i<dataOutput.size();i++){
System.out.println("dataOutput"+i+":"+dataOutput.get(i));
}

}
});

StackPane root = new StackPane();
root.getChildren().add(btn);

Scene scene = new Scene(root, 300, 250);

primaryStage.setTitle("Hello World!");
primaryStage.setScene(scene);
primaryStage.show();
}

/**
* @param args the command line arguments
*/
public static void main(String[] args) {
launch(args);
}

public ArrayList<Integer> dataInput=new ArrayList<>();
public ArrayList<Integer> dataOutput=new ArrayList<>();

public class MyThread extends Thread{
int startIndex;
int endIndex;
int currentPostion;
public MyThread(int startIndex,int endIndex){
this.startIndex =startIndex;
this.endIndex =endIndex;
this.currentPostion=startIndex;
System.out.println("读取数组列表：第"+startIndex+"到第"+endIndex+"条记录");
}
@Override
public void run(){
while(true){
int number=dataInput.get(currentPostion);
dataOutput.add(number);
System.out.println("正在读取第"+currentPostion+"条记录");
currentPostion++;
if(currentPostion==endIndex+1){
return;
}
}
}
}

}