线程的启动的两种方法，Runnable接口，run（）的调用
https://www.cnblogs.com/echo-cheng/p/6814909.html
实现并启动线程有两种方法
1、写一个类继承自Thread类，重写run()方法，用start()方法启动线程。
2、写一个类实现Runnable接口，实现run()方法，用new Thread(Runnable target).start()方法。
多线程原理
start()排队，CPU选中后执行就run()，当CPU的运行的时间片执行完，这个线程就继续排队，等待下一次的run()。
1、start()方法来启动线程，真正实现多线程运行。
2、run()方法当做普通方法的方式调用。
程序还是要顺序执行，要等待run方法体执行完毕后，才可继续执行下面的代码； 程序中只有主线程——这一个线程， 其程序执行路径还是只有一条， 这样就没有达到写线程的目的。
多线程就是分时利用CPU，宏观上让所有线程一起执行 ，也叫并发
class Test {
public static void main(String[] args) {
// TODO Auto-generated method stub
Runner1 runner1 = new Runner1();
Runner2 runner2 = new Runner2();
//Thread(Runnable target)分配新的对象
Thread thread1 = new Thread(runner1);
Thread thread2 = new Thread(runner2);
thread1.start();
thread2.start();
}
}
class Runner1 implements Runnable{
@Override
public void run() {
// TODO Auto-generated method stub
for(int i=0;i<100;i++) {
System.out.println("进入Runner1运行状态----"+i);
}
}
}
class Runner2 implements Runnable{
@Override
public void run() {
// TODO Auto-generated method stub
for (int i = 0; i < 100; i++) {
System.out.println("进入Runner2运行状态==========" + i);
}
}
}
运行结果：
进入Runner1运行状态----0
进入Runner2运行状态==========0
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class Test {
public static void main(String[] args) {
// TODO Auto-generated method stub
Runner1 runner1 = new Runner1();
Runner2 runner2 = new Runner2();
//Thread(Runnable target)分配新的对象
Thread thread1 = new Thread(runner1);
Thread thread2 = new Thread(runner2);
thread1.run();
thread2.run();
}
}
class Runner1 implements Runnable{
@Override
public void run() {
// TODO Auto-generated method stub
for(int i=0;i<100;i++) {
System.out.println("进入Runner1运行状态----"+i);
}
}
}
class Runner2 implements Runnable{
@Override
public void run() {
// TODO Auto-generated method stub
for (int i = 0; i < 100; i++) {
System.out.println("进入Runner2运行状态==========" + i);
}
}
}
运行结果：
进入Runner1运行状态----0
进入Runner1运行状态----1
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