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junzi2013:
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黑马程序员:MyEclipse9 常用快捷键 中英文对照 及 快速get set方法 -
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黑马程序员:MyEclipse9 常用快捷键 中英文对照 及 快速get set方法 -
idealab:
博主说的OpenCSV, JavaCSV, SuperCSV都 ...
csv调研 -
tanxin:
楼主怎么解决这个问题的呢?
坑爹的zookeer -
yy22258867:
:twisted:
黑马程序员19-7:foreach遍历核心源码,遍历HashMap需要用map.keySet()或map.entrySet()
下面的做法,会发现输出结果被打断了。
main应该执行完10次才到sub的,可是被打断了
子线程和主线程加了字节码的锁,形成了互斥,但并非一人一次。
把线程锁封装到方法体里边,这个时候,可以看到主函数中,并没有线程锁,所以,线程锁是主函数中的一部分,因此,循环也应该是循环后再控制同步
实现了一来一往互斥效果
synchronized method:
whili(!){
this.wait();
}
false;
this.notify();
synchronized method:
while(){
this.wait();
}
false;
this.notify();
package com.lee.thread; //子线程循环10次,主线程循环100次,接着又到子线程循环10次,接着又到主线程循环100次,如此反复50次 public class TraditionalThreadComunication { public static void main(String[] args) { // 子线程 new Thread(new Runnable() { @Override public void run() { for (int i = 1; i <= 50; i++) { for (int j = 1; j <= 10; j++) { System.out.println("sub: " + j + " loop: " + i); } } } }).start(); // 主线程 for (int i = 1; i <= 50; i++) { for (int j = 1; j <= 10; j++) { System.out.println("main: " + j + " loop: " + i); } } } }
main应该执行完10次才到sub的,可是被打断了
main: 1 loop: 1 main: 2 loop: 1 sub: 1 loop: 1 sub: 2 loop: 1 main: 3 loop: 1 sub: 3 loop: 1
子线程和主线程加了字节码的锁,形成了互斥,但并非一人一次。
//子线程循环10次,主线程循环100次,接着又到子线程循环10次,接着又到主线程循环100次,如此反复50次 public class TraditionalThreadComunication { public static void main(String[] args) { // 子线程 new Thread(new Runnable() { @Override public void run() { for (int i = 1; i <= 50; i++) { synchronized (TraditionalThreadComunication.class) { for (int j = 1; j <= 10; j++) { System.out.println("sub: " + j + " loop: " + i); } } } } }).start(); // 主线程 for (int i = 1; i <= 50; i++) { synchronized (TraditionalThreadComunication.class){ for (int j = 1; j <= 10; j++) { System.out.println("main: " + j + " loop: " + i); } } } } }
main: 1 loop: 1 main: 2 loop: 1 main: 3 loop: 1 main: 4 loop: 1 main: 5 loop: 1 main: 6 loop: 1 main: 7 loop: 1 main: 8 loop: 1 main: 9 loop: 1 main: 10 loop: 1 main: 1 loop: 2 main: 2 loop: 2 main: 3 loop: 2 main: 4 loop: 2 main: 5 loop: 2 main: 6 loop: 2 main: 7 loop: 2 main: 8 loop: 2 main: 9 loop: 2 main: 10 loop: 2 main: 1 loop: 3 main: 2 loop: 3 main: 3 loop: 3 main: 4 loop: 3 main: 5 loop: 3 main: 6 loop: 3 main: 7 loop: 3 main: 8 loop: 3 main: 9 loop: 3 main: 10 loop: 3 main: 1 loop: 4 main: 2 loop: 4 main: 3 loop: 4 main: 4 loop: 4 main: 5 loop: 4 main: 6 loop: 4 main: 7 loop: 4 main: 8 loop: 4 main: 9 loop: 4 main: 10 loop: 4 sub: 1 loop: 1 sub: 2 loop: 1 sub: 3 loop: 1 sub: 4 loop: 1 sub: 5 loop: 1 sub: 6 loop: 1 sub: 7 loop: 1 sub: 8 loop: 1 sub: 9 loop: 1 sub: 10 loop: 1 sub: 1 loop: 2 sub: 2 loop: 2 sub: 3 loop: 2 sub: 4 loop: 2 sub: 5 loop: 2 sub: 6 loop: 2 sub: 7 loop: 2 sub: 8 loop: 2
把线程锁封装到方法体里边,这个时候,可以看到主函数中,并没有线程锁,所以,线程锁是主函数中的一部分,因此,循环也应该是循环后再控制同步
package com.lee.thread; //子线程循环10次,主线程循环100次,接着又到子线程循环10次,接着又到主线程循环100次,如此反复50次 public class TraditionalThreadComunication { public static void main(String[] args) { final Business business = new Business(); // 子线程 new Thread(new Runnable() { @Override public void run() { for (int i = 1; i <= 50; i++) { business.sub(i); } } }).start(); // 主线程 for (int i = 1; i <= 50; i++) { business.main(i); } } } class Business{ public synchronized void sub(int i){ for (int j = 1; j <= 10; j++) { System.out.println("sub: " + j + " loop: " + i); } } public synchronized void main(int i){ for (int j = 1; j <= 10; j++) { System.out.println("main: " + j + " loop: " + i); } } }
main: 1 loop: 3 main: 2 loop: 3 main: 3 loop: 3 main: 4 loop: 3 main: 5 loop: 3 main: 6 loop: 3 main: 7 loop: 3 main: 8 loop: 3 main: 9 loop: 3 main: 10 loop: 3 main: 1 loop: 4 main: 2 loop: 4 main: 3 loop: 4 main: 4 loop: 4 main: 5 loop: 4 main: 6 loop: 4 main: 7 loop: 4 main: 8 loop: 4 main: 9 loop: 4 main: 10 loop: 4 main: 1 loop: 5 main: 2 loop: 5 main: 3 loop: 5 main: 4 loop: 5 main: 5 loop: 5 main: 6 loop: 5 main: 7 loop: 5 main: 8 loop: 5 main: 9 loop: 5 main: 10 loop: 5 main: 1 loop: 6 main: 2 loop: 6 main: 3 loop: 6 main: 4 loop: 6 main: 5 loop: 6 main: 6 loop: 6 main: 7 loop: 6 main: 8 loop: 6 main: 9 loop: 6 main: 10 loop: 6 main: 1 loop: 7 main: 2 loop: 7 main: 3 loop: 7 main: 4 loop: 7 main: 5 loop: 7 main: 6 loop: 7 main: 7 loop: 7 main: 8 loop: 7 main: 9 loop: 7 main: 10 loop: 7 main: 1 loop: 8 main: 2 loop: 8 main: 3 loop: 8 main: 4 loop: 8 main: 5 loop: 8 main: 6 loop: 8 main: 7 loop: 8 main: 8 loop: 8 main: 9 loop: 8 main: 10 loop: 8 main: 1 loop: 9 main: 2 loop: 9 main: 3 loop: 9 main: 4 loop: 9 main: 5 loop: 9 main: 6 loop: 9 main: 7 loop: 9 main: 8 loop: 9 main: 9 loop: 9 main: 10 loop: 9 main: 1 loop: 10 main: 2 loop: 10 main: 3 loop: 10 main: 4 loop: 10 main: 5 loop: 10 main: 6 loop: 10 main: 7 loop: 10 main: 8 loop: 10 main: 9 loop: 10 main: 10 loop: 10 main: 1 loop: 11 main: 2 loop: 11 main: 3 loop: 11 main: 4 loop: 11 main: 5 loop: 11 main: 6 loop: 11 main: 7 loop: 11 main: 8 loop: 11 main: 9 loop: 11 main: 10 loop: 11 main: 1 loop: 12 main: 2 loop: 12 main: 3 loop: 12 main: 4 loop: 12 main: 5 loop: 12 main: 6 loop: 12 main: 7 loop: 12 main: 8 loop: 12 main: 9 loop: 12 main: 10 loop: 12 main: 1 loop: 13 main: 2 loop: 13 main: 3 loop: 13 main: 4 loop: 13 main: 5 loop: 13 main: 6 loop: 13 main: 7 loop: 13 main: 8 loop: 13 main: 9 loop: 13 main: 10 loop: 13 main: 1 loop: 14 main: 2 loop: 14 main: 3 loop: 14 main: 4 loop: 14 main: 5 loop: 14 main: 6 loop: 14 main: 7 loop: 14 main: 8 loop: 14 main: 9 loop: 14 main: 10 loop: 14 main: 1 loop: 15 main: 2 loop: 15 main: 3 loop: 15 main: 4 loop: 15 main: 5 loop: 15 main: 6 loop: 15 main: 7 loop: 15 main: 8 loop: 15 main: 9 loop: 15 main: 10 loop: 15 main: 1 loop: 16 main: 2 loop: 16 main: 3 loop: 16 main: 4 loop: 16 main: 5 loop: 16 main: 6 loop: 16 main: 7 loop: 16 main: 8 loop: 16 main: 9 loop: 16 main: 10 loop: 16 main: 1 loop: 17 main: 2 loop: 17 main: 3 loop: 17 main: 4 loop: 17 main: 5 loop: 17 main: 6 loop: 17 main: 7 loop: 17 main: 8 loop: 17 main: 9 loop: 17 main: 10 loop: 17 main: 1 loop: 18 main: 2 loop: 18 main: 3 loop: 18 main: 4 loop: 18 main: 5 loop: 18 main: 6 loop: 18 main: 7 loop: 18 main: 8 loop: 18 main: 9 loop: 18 main: 10 loop: 18 main: 1 loop: 19 main: 2 loop: 19 main: 3 loop: 19 main: 4 loop: 19 main: 5 loop: 19 main: 6 loop: 19 main: 7 loop: 19 main: 8 loop: 19 main: 9 loop: 19 main: 10 loop: 19 main: 1 loop: 20 main: 2 loop: 20 main: 3 loop: 20 main: 4 loop: 20 main: 5 loop: 20 main: 6 loop: 20 main: 7 loop: 20 main: 8 loop: 20 main: 9 loop: 20 main: 10 loop: 20 main: 1 loop: 21 main: 2 loop: 21 main: 3 loop: 21 main: 4 loop: 21 main: 5 loop: 21 main: 6 loop: 21 main: 7 loop: 21 main: 8 loop: 21 main: 9 loop: 21 main: 10 loop: 21 main: 1 loop: 22 main: 2 loop: 22 main: 3 loop: 22 main: 4 loop: 22 main: 5 loop: 22 main: 6 loop: 22 main: 7 loop: 22 main: 8 loop: 22 main: 9 loop: 22 main: 10 loop: 22 main: 1 loop: 23 main: 2 loop: 23 main: 3 loop: 23 main: 4 loop: 23 main: 5 loop: 23 main: 6 loop: 23 main: 7 loop: 23 main: 8 loop: 23 main: 9 loop: 23 main: 10 loop: 23 main: 1 loop: 24 main: 2 loop: 24 main: 3 loop: 24 main: 4 loop: 24 main: 5 loop: 24 main: 6 loop: 24 main: 7 loop: 24 main: 8 loop: 24 main: 9 loop: 24 main: 10 loop: 24 main: 1 loop: 25 main: 2 loop: 25 main: 3 loop: 25 main: 4 loop: 25 main: 5 loop: 25 main: 6 loop: 25 main: 7 loop: 25 main: 8 loop: 25 main: 9 loop: 25 main: 10 loop: 25 main: 1 loop: 26 main: 2 loop: 26 main: 3 loop: 26 main: 4 loop: 26 main: 5 loop: 26 main: 6 loop: 26 main: 7 loop: 26 main: 8 loop: 26 main: 9 loop: 26 main: 10 loop: 26 main: 1 loop: 27 main: 2 loop: 27 main: 3 loop: 27 main: 4 loop: 27 main: 5 loop: 27 main: 6 loop: 27 main: 7 loop: 27 main: 8 loop: 27 main: 9 loop: 27 main: 10 loop: 27 main: 1 loop: 28 main: 2 loop: 28 main: 3 loop: 28 main: 4 loop: 28 main: 5 loop: 28 main: 6 loop: 28 main: 7 loop: 28 main: 8 loop: 28 main: 9 loop: 28 main: 10 loop: 28 main: 1 loop: 29 main: 2 loop: 29 main: 3 loop: 29 main: 4 loop: 29 main: 5 loop: 29 main: 6 loop: 29 main: 7 loop: 29 main: 8 loop: 29 main: 9 loop: 29 main: 10 loop: 29 main: 1 loop: 30 main: 2 loop: 30 main: 3 loop: 30 main: 4 loop: 30 main: 5 loop: 30 main: 6 loop: 30 main: 7 loop: 30 main: 8 loop: 30 main: 9 loop: 30 main: 10 loop: 30 main: 1 loop: 31 main: 2 loop: 31 main: 3 loop: 31 main: 4 loop: 31 main: 5 loop: 31 main: 6 loop: 31 main: 7 loop: 31 main: 8 loop: 31 main: 9 loop: 31 main: 10 loop: 31 main: 1 loop: 32 main: 2 loop: 32 main: 3 loop: 32 main: 4 loop: 32 main: 5 loop: 32 main: 6 loop: 32 main: 7 loop: 32 main: 8 loop: 32 main: 9 loop: 32 main: 10 loop: 32 main: 1 loop: 33 main: 2 loop: 33 main: 3 loop: 33 main: 4 loop: 33 main: 5 loop: 33 main: 6 loop: 33 main: 7 loop: 33 main: 8 loop: 33 main: 9 loop: 33 main: 10 loop: 33 main: 1 loop: 34 main: 2 loop: 34 main: 3 loop: 34 main: 4 loop: 34 main: 5 loop: 34 main: 6 loop: 34 main: 7 loop: 34 main: 8 loop: 34 main: 9 loop: 34 main: 10 loop: 34 main: 1 loop: 35 main: 2 loop: 35 main: 3 loop: 35 main: 4 loop: 35 main: 5 loop: 35 main: 6 loop: 35 main: 7 loop: 35 main: 8 loop: 35 main: 9 loop: 35 main: 10 loop: 35 main: 1 loop: 36 main: 2 loop: 36 main: 3 loop: 36 main: 4 loop: 36 main: 5 loop: 36 main: 6 loop: 36 main: 7 loop: 36 main: 8 loop: 36 main: 9 loop: 36 main: 10 loop: 36 main: 1 loop: 37 main: 2 loop: 37 main: 3 loop: 37 main: 4 loop: 37 main: 5 loop: 37 main: 6 loop: 37 main: 7 loop: 37 main: 8 loop: 37 main: 9 loop: 37 main: 10 loop: 37 main: 1 loop: 38 main: 2 loop: 38 main: 3 loop: 38 main: 4 loop: 38 main: 5 loop: 38 main: 6 loop: 38 main: 7 loop: 38 main: 8 loop: 38 main: 9 loop: 38 main: 10 loop: 38 main: 1 loop: 39 main: 2 loop: 39 main: 3 loop: 39 main: 4 loop: 39 main: 5 loop: 39 main: 6 loop: 39 main: 7 loop: 39 main: 8 loop: 39 main: 9 loop: 39 main: 10 loop: 39 main: 1 loop: 40 main: 2 loop: 40 main: 3 loop: 40 main: 4 loop: 40 main: 5 loop: 40 main: 6 loop: 40 main: 7 loop: 40 main: 8 loop: 40 main: 9 loop: 40 main: 10 loop: 40 main: 1 loop: 41 main: 2 loop: 41 main: 3 loop: 41 main: 4 loop: 41 main: 5 loop: 41 main: 6 loop: 41 main: 7 loop: 41 main: 8 loop: 41 main: 9 loop: 41 main: 10 loop: 41 main: 1 loop: 42 main: 2 loop: 42 main: 3 loop: 42 main: 4 loop: 42 main: 5 loop: 42 main: 6 loop: 42 main: 7 loop: 42 main: 8 loop: 42 main: 9 loop: 42 main: 10 loop: 42 main: 1 loop: 43 main: 2 loop: 43 main: 3 loop: 43 main: 4 loop: 43 main: 5 loop: 43 main: 6 loop: 43 main: 7 loop: 43 main: 8 loop: 43 main: 9 loop: 43 main: 10 loop: 43 main: 1 loop: 44 main: 2 loop: 44 main: 3 loop: 44 main: 4 loop: 44 main: 5 loop: 44 main: 6 loop: 44 main: 7 loop: 44 main: 8 loop: 44 main: 9 loop: 44 main: 10 loop: 44 main: 1 loop: 45 main: 2 loop: 45 main: 3 loop: 45 main: 4 loop: 45 main: 5 loop: 45 main: 6 loop: 45 main: 7 loop: 45 main: 8 loop: 45 main: 9 loop: 45 main: 10 loop: 45 main: 1 loop: 46 main: 2 loop: 46 main: 3 loop: 46 main: 4 loop: 46 main: 5 loop: 46 main: 6 loop: 46 main: 7 loop: 46 main: 8 loop: 46 main: 9 loop: 46 main: 10 loop: 46 main: 1 loop: 47 main: 2 loop: 47 main: 3 loop: 47 main: 4 loop: 47 main: 5 loop: 47 main: 6 loop: 47 main: 7 loop: 47 main: 8 loop: 47 main: 9 loop: 47 main: 10 loop: 47 main: 1 loop: 48 main: 2 loop: 48 main: 3 loop: 48 main: 4 loop: 48 main: 5 loop: 48 main: 6 loop: 48 main: 7 loop: 48 main: 8 loop: 48 main: 9 loop: 48 main: 10 loop: 48 main: 1 loop: 49 main: 2 loop: 49 main: 3 loop: 49 main: 4 loop: 49 main: 5 loop: 49 main: 6 loop: 49 main: 7 loop: 49 main: 8 loop: 49 main: 9 loop: 49 main: 10 loop: 49 main: 1 loop: 50 main: 2 loop: 50 main: 3 loop: 50 main: 4 loop: 50 main: 5 loop: 50 main: 6 loop: 50 main: 7 loop: 50 main: 8 loop: 50 main: 9 loop: 50 main: 10 loop: 50 sub: 1 loop: 1 sub: 2 loop: 1 sub: 3 loop: 1 sub: 4 loop: 1
实现了一来一往互斥效果
synchronized method:
whili(!){
this.wait();
}
false;
this.notify();
synchronized method:
while(){
this.wait();
}
false;
this.notify();
package com.lee.thread; //子线程循环10次,主线程循环100次,接着又到子线程循环10次,接着又到主线程循环100次,如此反复50次 public class TraditionalThreadComunication { public static void main(String[] args) throws Exception { final Business business = new Business(); // 子线程 new Thread(new Runnable() { @Override public void run() { for (int i = 1; i <= 50; i++) { try { business.sub(i); } catch (Exception e) { // TODO Auto-generated catch block e.printStackTrace(); } } } }).start(); // 主线程 for (int i = 1; i <= 50; i++) { business.main(i); } } } class Business { // sub与main已经互斥了 private boolean bShouldSub = true; // 1.2如果来的是子线程,不用等待,直接输出,然后唤醒对方,bShouldSub = false; // 1.4如果来的是子线程,不用等待,直接输出,然后唤醒对方, // 1.5如果来的是子线程,那么等待。 public synchronized void sub(int i) throws Exception { while (!bShouldSub) { this.wait(); } for (int j = 1; j <= 10; j++) { System.out.println("sub: " + j + " loop: " + i); } bShouldSub = false; this.notify(); } // 1.1如果来的是主线程,那么等待。 // 1.3如果来的是主线程,直接输出,bShouldSub = true,唤醒对方 public synchronized void main(int i) throws Exception { while (bShouldSub) { this.wait(); } for (int j = 1; j <= 10; j++) { System.out.println("main: " + j + " loop: " + i); } bShouldSub = true; this.notify(); } }
main thread sequence of 98,loop of 32 main thread sequence of 99,loop of 32 main thread sequence of 100,loop of 32 sub thread sequence of 1,loop of 33 sub thread sequence of 2,loop of 33 sub thread sequence of 3,loop of 33 sub thread sequence of 4,loop of 33 sub thread sequence of 5,loop of 33 sub thread sequence of 6,loop of 33 sub thread sequence of 7,loop of 33 sub thread sequence of 8,loop of 33 sub thread sequence of 9,loop of 33 sub thread sequence of 10,loop of 33 main thread sequence of 1,loop of 33 main thread sequence of 2,loop of 33
发表评论
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Java中的IO整理完整版
2013-02-15 17:23 662http://developer.51cto.com/art/ ... -
Myeclipse中导入zip文件查看源代码
2012-09-21 23:35 1001用Myeclipse的时候,出现无法查看源码的话,导入jdk文 ... -
==与equals
2012-09-13 20:15 595一般基本数据类型的比较用 == 当涉及到对象、字符串的时候,就 ... -
多线程课程002:线程范围内的共享变量
2012-09-13 16:47 907package cn.itcast.heima2; ... -
多线程课程001:线程安全的问题
2012-09-13 11:14 752package com.lee.thread; pu ... -
内部类的实际应用
2012-09-13 11:01 622public class TraditionalThreadS ... -
Java接口
2012-09-11 12:07 724Java接口的方法只能是抽象的和公开的,Java接口不能有构造 ... -
移位运算符
2012-09-11 09:31 807移位运算符 <<左移 a<<b,a转 ... -
【总结】gridbaglayout布局管理器
2012-08-15 11:19 660http://blog.sina.com.cn/s/blog_ ... -
【练习_00010】java不重复随机数
2012-08-14 01:26 655package com.heima.test; impo ... -
【练习】判断一个字符串中某些字段出现的次数
2012-08-14 01:08 934package com.heima.test; im ... -
选择、冒泡、折半排序查找方法
2012-08-13 15:06 1174import java.util.Arrays; i ... -
自己写的杨辉三角
2012-08-12 16:41 767package com.lee.graphic; p ... -
交换两个数的位置,不用中间变量
2012-08-06 02:28 1078a ^= b; b ^= a; a ^= b; 1 ... -
未解问题,定时器无法自定义切换时间
2012-07-30 18:08 976package com.heima.test004.enu ... -
黑马程序员:设计模式,享元模式flyweight
2012-07-23 02:13 0如果有很多很小的东西,对象,当他们有很多属性是相同的,就可以把 ... -
黑马程序员:for综合图形整合结晶
2012-07-23 01:16 773package Graph; public clas ... -
JS: js获取字符串长度
2012-07-20 18:01 0<SCRIPT LANGUAGE="Jav ... -
传智27-2: 模拟Tocat浏览器,写网页蜘蛛爬虫,抓取网页信息
2012-07-12 17:03 0package cn.itcast.net.p2.ie_s ... -
传智27-1:多线程上传图片,阻塞防止while空转
2012-07-12 16:59 0package cn.itcast.net.p1.uplo ...
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