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1、start()方法来启动线程,真正实现了多线程运行,这时无需等待run方法体代码执行完毕而直接继续执行下面的代码。
通过调用Thread类的start()方法来启动一个线程,这时此线程是处于就绪状态,并没有运行。然后JVM通过此Thread类调用方法run()来完成其运行操作的,这里方法run()称为线程执行体,它包含了要执行的这个线程的内容,run方法运行结束,此线程终止,而CPU再运行其它线程,
2、run()方法当作普通方法的方式调用,程序还是要顺序执行,还是要等待run方法体执行完毕后才可继续执行下面的代码。
如果直接用run方法,这只是调用一个方法而已,程序中依然只有主线程,只有这一个线程,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。
记住:线程就是为了更好地利用CPU,提高程序运行速率的!
为了更好地理解两者的区别,看以下的例子:
例程1:
程序的运行结果1(//th1.run();//th2.run();):
main
Thread-0 0
Thread-0 1
Thread-1 0
Thread-0 2
Thread-1 1
Thread-1 2
Thread-0 3
Thread-1 3
Thread-0 4
Thread-1 4
Thread-0 5
Thread-0 6
Thread-1 5
Thread-0 7
Thread-1 6
Thread-0 8
Thread-1 7
Thread-0 9
Thread-1 8
Thread-0 10
Thread-0 11
Thread-0 12
Thread-1 9
Thread-0 13
Thread-0 14
Thread-1 10
Thread-0 15
Thread-0 16
Thread-1 11
Thread-0 17
Thread-1 12
Thread-0 18
Thread-1 13
Thread-0 19
Thread-1 14
Thread-1 15
Thread-1 16
Thread-1 17
Thread-1 18
Thread-1 19
程序的运行结果2:(//th1.start();//th2.start();)
main
main 0
main 1
main 2
main 3
main 4
main 5
main 6
main 7
main 8
main 9
main 10
main 11
main 12
main 13
main 14
main 15
main 16
main 17
main 18
main 19
main 0
main 1
main 2
main 3
main 4
main 5
main 6
main 7
main 8
main 9
main 10
main 11
main 12
main 13
main 14
main 15
main 16
main 17
main 18
main 19
运行结果分析:线程对象调用start()方法,就表示启动了线程,即又产生了一条执行线索。而调用run()方法,只是相当于普通的方法调用,并没有产生新的执行线索,run()方法仍然在调用它的线程中执行。
如下图1为两种不同情况的比较:
假设将程序中的注释都去掉:
例程2:
程序的运行结果如下:
第一种结果:
main
Thread-0 0
Thread-1 0
Thread-1 1
Thread-1 2
main 0
Thread-1 3
Thread-0 1
Thread-1 4
main 1
main 2
main 3
main 4
main 5
Thread-1 5
Thread-0 2
Thread-0 3
Thread-0 4
Thread-0 5
Thread-0 6
Thread-0 7
Thread-1 6
Thread-1 7
main 6
Thread-1 8
Thread-0 8
Thread-0 9
Thread-1 9
main 7
Thread-1 10
Thread-0 10
Thread-1 11
main 8
main 9
Thread-1 12
Thread-0 11
Thread-1 13
Thread-1 14
Thread-1 15
main 10
Thread-1 16
Thread-1 17
Thread-0 12
Thread-1 18
main 11
Thread-1 19
Thread-0 13
Thread-0 14
main 12
main 13
main 14
Thread-0 15
main 15
Thread-0 16
main 16
main 17
Thread-0 17
main 18
Thread-0 18
main 19
Thread-0 19
第二种结果:
main
main 0
Thread-0 0
Thread-1 0
Thread-0 1
main 1
main 2
Thread-0 2
Thread-1 1
Thread-0 3
main 3
main 4
Thread-0 4
Thread-0 5
Thread-0 6
Thread-0 7
Thread-1 2
Thread-0 8
main 5
Thread-0 9
Thread-1 3
Thread-0 10
main 6
Thread-0 11
Thread-1 4
Thread-0 12
main 7
Thread-0 13
Thread-1 5
Thread-0 14
main 8
Thread-0 15
Thread-1 6
Thread-0 16
main 9
Thread-0 17
Thread-1 7
Thread-0 18
main 10
Thread-0 19
Thread-1 8
main 11
Thread-1 9
main 12
Thread-1 10
Thread-1 11
main 13
Thread-1 12
Thread-1 13
Thread-1 14
main 14
Thread-1 15
main 15
Thread-1 16
main 16
main 17
Thread-1 17
main 18
Thread-1 18
main 19
Thread-1 19
main 0
main 1
main 2
main 3
main 4
main 5
main 6
main 7
main 8
main 9
main 10
main 11
main 12
main 13
main 14
main 15
main 16
main 17
main 18
main 19
问题:为什么会产生这两种结果?
例程3:
程序的运行结果如下:
第一种结果:
main 0
main 1
Thread-0 0
Thread-1 0
Thread-1 1
Thread-0 1
Thread-0 2
main 2
Thread-0 3
Thread-1 2
Thread-0 4
Thread-0 5
main 3
Thread-0 6
Thread-1 3
Thread-0 7
main 4
main 5
Thread-0 8
Thread-0 9
Thread-1 4
Thread-1 5
Thread-1 6
Thread-0 10
main 6
Thread-0 11
Thread-1 7
Thread-0 12
Thread-0 13
Thread-0 14
main 7
main 8
main 9
main 10
Thread-0 15
Thread-0 16
Thread-1 8
Thread-0 17
main 11
Thread-0 18
Thread-1 9
Thread-1 10
Thread-1 11
Thread-0 19
main 12
main 13
main 14
Thread-1 12
main 15
Thread-1 13
main 16
Thread-1 14
main 17
Thread-1 15
main 18
main 19
Thread-1 16
main 0
Thread-1 17
main 1
Thread-1 18
Thread-1 19
main 2
main 3
main 4
main 5
main 6
main 7
main 8
main 9
main 10
main 11
main 12
main 13
main 14
main 15
main 16
main 17
main 18
main 19
第二种结果:
Thread-0 0
Thread-1 0
Thread-1 1
Thread-1 2
main 0
Thread-1 3
Thread-0 1
Thread-0 2
Thread-1 4
main 1
Thread-1 5
Thread-1 6
Thread-1 7
Thread-0 3
Thread-1 8
Thread-1 9
main 2
Thread-1 10
Thread-0 4
Thread-1 11
Thread-1 12
main 3
main 4
Thread-1 13
Thread-0 5
Thread-1 14
main 5
Thread-1 15
Thread-0 6
Thread-0 7
Thread-0 8
Thread-0 9
Thread-1 16
main 6
Thread-1 17
Thread-0 10
Thread-0 11
Thread-1 18
Thread-1 19
main 7
main 8
main 9
Thread-0 12
Thread-0 13
main 10
Thread-0 14
Thread-0 15
Thread-0 16
main 11
Thread-0 17
main 12
Thread-0 18
main 13
Thread-0 19
main 14
main 15
main 16
main 17
main 18
main 19
第三种结果:
main 0
main 1
main 2
main 3
main 4
main 5
main 6
main 7
main 8
main 9
main 10
main 11
main 12
main 13
main 14
main 15
main 16
main 17
main 18
main 19
Thread-1 0
Thread-0 0
Thread-1 1
main 0
main 1
Thread-0 1
main 2
Thread-1 2
Thread-1 3
Thread-1 4
main 3
main 4
Thread-0 2
main 5
Thread-1 5
main 6
Thread-0 3
main 7
Thread-1 6
main 8
Thread-0 4
Thread-0 5
main 9
main 10
main 11
Thread-1 7
main 12
main 13
main 14
Thread-0 6
main 15
Thread-1 8
main 16
Thread-0 7
main 17
Thread-1 9
main 18
main 19
Thread-0 8
Thread-0 9
main 0
Thread-1 10
main 1
main 2
Thread-0 10
Thread-0 11
Thread-0 12
main 3
Thread-1 11
Thread-1 12
Thread-1 13
main 4
Thread-0 13
main 5
Thread-1 14
main 6
Thread-0 14
main 7
Thread-1 15
main 8
main 9
main 10
Thread-0 15
Thread-0 16
main 11
Thread-1 16
main 12
Thread-0 17
main 13
Thread-1 17
main 14
Thread-0 18
main 15
Thread-1 18
Thread-1 19
main 16
Thread-0 19
main 17
main 18
main 19
问题:为什么会产生这三种结果?
例程4:
程序运行结果如下:
main 0
main 1
main 2
main 3
main 4
main 5
main 6
main 7
main 8
main 9
main 10
main 11
main 12
main 13
main 14
main 15
main 16
main 17
main 18
main 19
main 0
main 1
main 2
main 3
main 4
main 5
main 6
main 7
main 8
main 9
main 10
main 11
main 12
main 13
main 14
main 15
main 16
main 17
main 18
main 19
main 0
main 1
main 2
main 3
main 4
main 5
main 6
main 7
main 8
main 9
main 10
main 11
main 12
main 13
main 14
main 15
main 16
main 17
main 18
main 19
说明:在这种情况下才会产生惟一结果。线程对象直接调用run()方法,在主线程中顺序执行。
通过调用Thread类的start()方法来启动一个线程,这时此线程是处于就绪状态,并没有运行。然后JVM通过此Thread类调用方法run()来完成其运行操作的,这里方法run()称为线程执行体,它包含了要执行的这个线程的内容,run方法运行结束,此线程终止,而CPU再运行其它线程,
2、run()方法当作普通方法的方式调用,程序还是要顺序执行,还是要等待run方法体执行完毕后才可继续执行下面的代码。
如果直接用run方法,这只是调用一个方法而已,程序中依然只有主线程,只有这一个线程,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。
记住:线程就是为了更好地利用CPU,提高程序运行速率的!
为了更好地理解两者的区别,看以下的例子:
例程1:
public class TestThread { public static void main(String arg[]){ NewThread t1 = new NewThread(); NewThread t2 = new NewThread(); Thread th1 = new Thread(t1); Thread th2 = new Thread(t2); System.out.println(Thread.currentThread().getName() ); th1.start(); th2.start(); //th1.run(); //th2.run(); } } class NewThread implements Runnable{ int i = 0; public void run() { for(int i = 0; i <20;i ++){ System.out.println(Thread.currentThread().getName() +" "+ i); } } }
程序的运行结果1(//th1.run();//th2.run();):
main
Thread-0 0
Thread-0 1
Thread-1 0
Thread-0 2
Thread-1 1
Thread-1 2
Thread-0 3
Thread-1 3
Thread-0 4
Thread-1 4
Thread-0 5
Thread-0 6
Thread-1 5
Thread-0 7
Thread-1 6
Thread-0 8
Thread-1 7
Thread-0 9
Thread-1 8
Thread-0 10
Thread-0 11
Thread-0 12
Thread-1 9
Thread-0 13
Thread-0 14
Thread-1 10
Thread-0 15
Thread-0 16
Thread-1 11
Thread-0 17
Thread-1 12
Thread-0 18
Thread-1 13
Thread-0 19
Thread-1 14
Thread-1 15
Thread-1 16
Thread-1 17
Thread-1 18
Thread-1 19
程序的运行结果2:(//th1.start();//th2.start();)
main
main 0
main 1
main 2
main 3
main 4
main 5
main 6
main 7
main 8
main 9
main 10
main 11
main 12
main 13
main 14
main 15
main 16
main 17
main 18
main 19
main 0
main 1
main 2
main 3
main 4
main 5
main 6
main 7
main 8
main 9
main 10
main 11
main 12
main 13
main 14
main 15
main 16
main 17
main 18
main 19
运行结果分析:线程对象调用start()方法,就表示启动了线程,即又产生了一条执行线索。而调用run()方法,只是相当于普通的方法调用,并没有产生新的执行线索,run()方法仍然在调用它的线程中执行。
如下图1为两种不同情况的比较:
假设将程序中的注释都去掉:
例程2:
public class TestThread { public static void main(String arg[]){ NewThread t1 = new NewThread(); NewThread t2 = new NewThread(); Thread th1 = new Thread(t1); Thread th2 = new Thread(t2); System.out.println(Thread.currentThread().getName()); th1.start(); th2.start(); th1.run(); th2.run(); } } class NewThread implements Runnable{ int i = 0; public void run() { for(int i = 0; i <20;i ++){ System.out.println(Thread.currentThread().getName() +" "+ i); } } }
程序的运行结果如下:
第一种结果:
main
Thread-0 0
Thread-1 0
Thread-1 1
Thread-1 2
main 0
Thread-1 3
Thread-0 1
Thread-1 4
main 1
main 2
main 3
main 4
main 5
Thread-1 5
Thread-0 2
Thread-0 3
Thread-0 4
Thread-0 5
Thread-0 6
Thread-0 7
Thread-1 6
Thread-1 7
main 6
Thread-1 8
Thread-0 8
Thread-0 9
Thread-1 9
main 7
Thread-1 10
Thread-0 10
Thread-1 11
main 8
main 9
Thread-1 12
Thread-0 11
Thread-1 13
Thread-1 14
Thread-1 15
main 10
Thread-1 16
Thread-1 17
Thread-0 12
Thread-1 18
main 11
Thread-1 19
Thread-0 13
Thread-0 14
main 12
main 13
main 14
Thread-0 15
main 15
Thread-0 16
main 16
main 17
Thread-0 17
main 18
Thread-0 18
main 19
Thread-0 19
第二种结果:
main
main 0
Thread-0 0
Thread-1 0
Thread-0 1
main 1
main 2
Thread-0 2
Thread-1 1
Thread-0 3
main 3
main 4
Thread-0 4
Thread-0 5
Thread-0 6
Thread-0 7
Thread-1 2
Thread-0 8
main 5
Thread-0 9
Thread-1 3
Thread-0 10
main 6
Thread-0 11
Thread-1 4
Thread-0 12
main 7
Thread-0 13
Thread-1 5
Thread-0 14
main 8
Thread-0 15
Thread-1 6
Thread-0 16
main 9
Thread-0 17
Thread-1 7
Thread-0 18
main 10
Thread-0 19
Thread-1 8
main 11
Thread-1 9
main 12
Thread-1 10
Thread-1 11
main 13
Thread-1 12
Thread-1 13
Thread-1 14
main 14
Thread-1 15
main 15
Thread-1 16
main 16
main 17
Thread-1 17
main 18
Thread-1 18
main 19
Thread-1 19
main 0
main 1
main 2
main 3
main 4
main 5
main 6
main 7
main 8
main 9
main 10
main 11
main 12
main 13
main 14
main 15
main 16
main 17
main 18
main 19
问题:为什么会产生这两种结果?
例程3:
public class TestThread { public static void main(String arg[]){ NewThread t1 = new NewThread(); NewThread t2 = new NewThread(); Thread th1 = new Thread(t1); Thread th2 = new Thread(t2); th1.start(); th2.start(); for(int i = 0; i <20;i ++){ System.out.println(Thread.currentThread().getName() +" "+ i); } th1.run(); th2.run(); } } class NewThread implements Runnable{ int i = 0; public void run() { for(int i = 0; i <20;i ++){ System.out.println(Thread.currentThread().getName() +" "+ i); } } }
程序的运行结果如下:
第一种结果:
main 0
main 1
Thread-0 0
Thread-1 0
Thread-1 1
Thread-0 1
Thread-0 2
main 2
Thread-0 3
Thread-1 2
Thread-0 4
Thread-0 5
main 3
Thread-0 6
Thread-1 3
Thread-0 7
main 4
main 5
Thread-0 8
Thread-0 9
Thread-1 4
Thread-1 5
Thread-1 6
Thread-0 10
main 6
Thread-0 11
Thread-1 7
Thread-0 12
Thread-0 13
Thread-0 14
main 7
main 8
main 9
main 10
Thread-0 15
Thread-0 16
Thread-1 8
Thread-0 17
main 11
Thread-0 18
Thread-1 9
Thread-1 10
Thread-1 11
Thread-0 19
main 12
main 13
main 14
Thread-1 12
main 15
Thread-1 13
main 16
Thread-1 14
main 17
Thread-1 15
main 18
main 19
Thread-1 16
main 0
Thread-1 17
main 1
Thread-1 18
Thread-1 19
main 2
main 3
main 4
main 5
main 6
main 7
main 8
main 9
main 10
main 11
main 12
main 13
main 14
main 15
main 16
main 17
main 18
main 19
第二种结果:
Thread-0 0
Thread-1 0
Thread-1 1
Thread-1 2
main 0
Thread-1 3
Thread-0 1
Thread-0 2
Thread-1 4
main 1
Thread-1 5
Thread-1 6
Thread-1 7
Thread-0 3
Thread-1 8
Thread-1 9
main 2
Thread-1 10
Thread-0 4
Thread-1 11
Thread-1 12
main 3
main 4
Thread-1 13
Thread-0 5
Thread-1 14
main 5
Thread-1 15
Thread-0 6
Thread-0 7
Thread-0 8
Thread-0 9
Thread-1 16
main 6
Thread-1 17
Thread-0 10
Thread-0 11
Thread-1 18
Thread-1 19
main 7
main 8
main 9
Thread-0 12
Thread-0 13
main 10
Thread-0 14
Thread-0 15
Thread-0 16
main 11
Thread-0 17
main 12
Thread-0 18
main 13
Thread-0 19
main 14
main 15
main 16
main 17
main 18
main 19
第三种结果:
main 0
main 1
main 2
main 3
main 4
main 5
main 6
main 7
main 8
main 9
main 10
main 11
main 12
main 13
main 14
main 15
main 16
main 17
main 18
main 19
Thread-1 0
Thread-0 0
Thread-1 1
main 0
main 1
Thread-0 1
main 2
Thread-1 2
Thread-1 3
Thread-1 4
main 3
main 4
Thread-0 2
main 5
Thread-1 5
main 6
Thread-0 3
main 7
Thread-1 6
main 8
Thread-0 4
Thread-0 5
main 9
main 10
main 11
Thread-1 7
main 12
main 13
main 14
Thread-0 6
main 15
Thread-1 8
main 16
Thread-0 7
main 17
Thread-1 9
main 18
main 19
Thread-0 8
Thread-0 9
main 0
Thread-1 10
main 1
main 2
Thread-0 10
Thread-0 11
Thread-0 12
main 3
Thread-1 11
Thread-1 12
Thread-1 13
main 4
Thread-0 13
main 5
Thread-1 14
main 6
Thread-0 14
main 7
Thread-1 15
main 8
main 9
main 10
Thread-0 15
Thread-0 16
main 11
Thread-1 16
main 12
Thread-0 17
main 13
Thread-1 17
main 14
Thread-0 18
main 15
Thread-1 18
Thread-1 19
main 16
Thread-0 19
main 17
main 18
main 19
问题:为什么会产生这三种结果?
例程4:
public class TestThread { public static void main(String arg[]){ NewThread t1 = new NewThread(); NewThread t2 = new NewThread(); Thread th1 = new Thread(t1); Thread th2 = new Thread(t2); for(int i = 0; i <20;i ++){ System.out.println(Thread.currentThread().getName() +" "+ i); } th1.run(); th2.run(); } } class NewThread implements Runnable{ int i = 0; public void run() { for(int i = 0; i <20;i ++){ System.out.println(Thread.currentThread().getName() +" "+ i); } } }
程序运行结果如下:
main 0
main 1
main 2
main 3
main 4
main 5
main 6
main 7
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说明:在这种情况下才会产生惟一结果。线程对象直接调用run()方法,在主线程中顺序执行。
发表评论
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foreach循环
2013-06-24 16:15 1433从JDK1.5开始,Java提供了一个更简单的循环:forea ... -
可变参数
2013-06-24 15:38 1193从JDK1.5开始,Java允许使用可变参数为方法指定数量不确 ... -
泛型(core java 笔记)
2013-06-18 16:18 20201.为什么引入泛型 package generic; ... -
两个程序的说明
2010-10-19 09:26 11291、程序1的结果是: clas ... -
构造器初始化
2010-10-18 14:42 1476可以用构造器来进行初始化。在运行时刻,可以调用方法或执行某些动 ... -
成员初始化
2010-10-18 07:55 1195Java尽力保证:所有变量在使用前都能得到恰当的初始化。 对 ... -
线程的死锁
2010-10-11 19:21 1462当两个线程相互等待对方释放同步监视器时就会发生死锁,Java虚 ... -
线程的同步
2010-10-11 19:00 1246一个经典的关于线程安全性的问题:银行取钱问题。 银行取钱的基 ... -
java网站收集
2010-10-10 18:13 1225JAVA开发者最常去的25个英文网站:http://www.i ... -
控制线程
2010-10-10 16:06 19861、线程睡眠:sleep 如果我们需要让当前正在执行的线程暂 ... -
线程的状态
2010-09-28 19:00 995线程从创建到执行完毕的整个过程称为线程的生命周期,在整个生命周 ... -
Java中创建线程的两种方法
2010-09-26 10:18 5608在Java中创建线程有两种方法:继承Thread类和实现Run ... -
创建String对象过程的内存分配小结
2010-09-23 20:32 2744常量池(Constant Pool):指的是在编译期被确定,并 ... -
Java堆和栈的区别 经典总结(转载)
2010-09-18 16:48 1238栈与堆都是Java用来在Ram中存放数据的地方。 与C++不 ... -
Java初学者都必须理解的七大问题
2010-09-18 10:36 1097问题一:我声明了什么 ... -
关于计算java程序运行时间(转载)
2010-09-18 09:22 1090//第一种,伪代码 long startTime= ... -
for循环的优化
2010-09-17 20:29 2107在程序中经常用到for循环,当一些算法实时性要求非常高时,对f ... -
详细解析Java中抽象类和接口的区别(转载)
2010-09-17 10:16 1073在Java语言中,abstract class和inter ... -
集合类(四):Map集合
2010-09-16 20:26 21205、Map集合 Map集合为映射类型,映射与集和列表有明显的区 ... -
集合类(三):Set集合
2010-09-16 19:43 28714、Set集合 Set集合为集类型,集是最简单的一种集合,存放 ...
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