java多线程1：
a.线程调用具有随机性，cpu执行哪个线程具有不确定性
在使用多线程技术时，多线程的运行结果和多线程的执行顺序或者调用顺序是无关的。
线程是一个子任务，cup以不确定的方式，或者说是以随机的时间来调用线程中的run方法。
下边测试一波线程调用的随机性：（调用方法的顺序都是随机的）
package MultiThread;
public class MainAndThread {
public static class MyThread extends Thread {
public void run() {
for (int i = 0; i < 10; i++) {
try {
Thread.sleep(100);
System.out.println("MyThread++++++++++++++++++" + Thread.currentThread().getName() + "" + i);
} catch (InterruptedException e) {
e.printStackTrace();
}
}
}
}
public static void main(String[] args) {
MyThread MyThread = new MyThread();
MyThread.setName("小熊的MyThread");
MyThread.start();
for (int j = 0; j < 10; j++) {
try {
Thread.sleep(100);
System.out.println("main--------------------" + Thread.currentThread().getName() + "" + j);
} catch (InterruptedException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
}
}
}
控制台：
b.执行start()方法的顺序不代表线程启动的顺序
package MultiThread;
public class StartOrder {
public static class MyThread extends Thread {
int i;
public MyThread(int i) {
this.i = i;
}
public void run() {
System.out.println("-----------" + i);
}
}
public static void main(String[] args) {
MyThread myThread1 = new MyThread(1);
MyThread myThread2 = new MyThread(2);
MyThread myThread3 = new MyThread(3);
MyThread myThread4 = new MyThread(4);
MyThread myThread5 = new MyThread(5);
MyThread myThread6 = new MyThread(6);
MyThread myThread7 = new MyThread(7);
MyThread myThread8 = new MyThread(8);
MyThread myThread9 = new MyThread(9);
MyThread myThread10 = new MyThread(10);
MyThread myThread11 = new MyThread(11);
myThread1.start();
myThread2.start();
myThread3.start();
myThread4.start();
myThread5.start();
myThread6.start();
myThread7.start();
myThread8.start();
myThread9.start();
myThread10.start();
myThread11.start();
}
}
控制台：
