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最新评论
1.设计 4 个线程,其中两个线程每次对 j增加1,另外两个线程对j每次减少1。
public class ThreadTest { public static void main(String[] args) { MyThread thread = new MyThread(); for (int i = 0; i < 2; i++) { Thread inc = new Thread(new Inc(thread)); Thread dec = new Thread(new Dec(thread)); inc.start(); dec.start(); } } } class MyThread { private int j; public synchronized void dec() { j--; System.out.println(Thread.currentThread().getName() + "-dec:" + j); } public synchronized void inc() { j++; System.out.println(Thread.currentThread().getName() + "-inc:" + j); } } class Dec implements Runnable { private MyThread obj; public Dec(MyThread obj) { this.obj = obj; } @Override public void run() { this.obj.dec(); } } class Inc implements Runnable { private MyThread obj; public Inc(MyThread obj) { this.obj = obj; } @Override public void run() { this.obj.inc(); } }
2.设计两个线程,第一个线程从1加到10,在这加的过程中,第二个线程必须等待,当第一个线程加到10时,第二个线程启动,从10减到1,在这减的过程中,第一个线程必须等待,循环执行若干时间后,退出程序。
import java.util.concurrent.ExecutorService; import java.util.concurrent.Executors; import java.util.concurrent.TimeUnit; public class ThreadTest { public static void main(String[] args) throws Exception { final Num num = new Num(); ExecutorService exec = Executors.newCachedThreadPool(); exec.execute(new Runnable() { @Override public void run() { try { while (!Thread.interrupted()) { TimeUnit.MILLISECONDS.sleep(200); num.increased(); num.waitForDecreasing(); } } catch (InterruptedException e) { System.out.println("Exiting via interrupt"); } System.out.println("Ending Increase"); } }); exec.execute(new Runnable() { @Override public void run() { try { while (!Thread.interrupted()) { num.waitForIncreasing(); TimeUnit.MILLISECONDS.sleep(200); num.decreased(); } } catch (InterruptedException e) { System.out.println("Exiting via interrupt"); } System.out.println("Ending Decrease"); } }); TimeUnit.SECONDS.sleep(5); // Run for a while... exec.shutdownNow(); // Interrupt all tasks } } class Num { private boolean flag = false; private int i; public synchronized void increased() { flag = true; for (i = 1; i < 11; i++) { System.out.println(Thread.currentThread().getName() + "-inc " + i); } notifyAll(); } public synchronized void decreased() { flag = false; for (i = 10; i > 0; i--) { System.out.println(Thread.currentThread().getName() + "-dec " + i); } notifyAll(); } public synchronized void waitForIncreasing() throws InterruptedException { while (flag == false) wait(); } public synchronized void waitForDecreasing() throws InterruptedException { while (flag == true) wait(); } }
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Java 8 获取当前日期
2018-12-12 14:38 648原创转载请注明出处:https://agilestyle. ... -
abstract class 和 interface区别
2017-09-06 23:12 360原创转载请注明出处:http://agilestyle.i ... -
Difference between <? super T> and <? extends T>
2017-05-24 10:34 444原创转载请注明出处:http://agilestyle.i ... -
a=a+b和a+=b的区别
2017-03-02 22:47 613原创转载请注明出处:http://agilestyle.i ... -
Java Object 九大方法
2017-02-22 21:46 349原创转载请注明出处:http://agilestyle.i ... -
Java Collections Framework Diagram
2016-12-14 15:43 380原创转载请注明出处:http://agilestyle.i ... -
Java三大领域+Python的技能图谱
2016-08-25 09:48 1764转自:来吧 主流编程语言图谱+知识库都在这了 Ja ... -
Top 8 Diagrams for Understanding Java(转)
2016-08-23 10:24 266转自:http://www.programcreek.co ... -
stream classdesc serialVersionUID = 1, local class serialVersionUID = 2
2016-05-27 14:56 3344原创转载请注明出处:http://agilestyle.i ... -
技术资料链接
2016-03-19 12:59 552LeeCode http://www.cnblogs.c ... -
Java取模
2015-09-13 11:41 701取模的规律:取模的结果符号永远与被除数的符号相同 pack ... -
Java面试——字符串
2013-09-18 22:53 911String中的常用方法 1.写出下面程序的输出结 ... -
Java面试——数组
2013-09-18 22:22 8891.下面哪几个选项是合 ... -
数据类型转换
2013-09-17 22:27 777数据类型的转换方式 ... -
Java面试——数据类型及类型转换
2013-09-16 22:42 13491.int和Integer有什么区别? 2.下面选 ... -
实例成员和类成员的区别
2013-09-16 12:05 1134下面关于实例成员的说法,哪些是正确的?CD A.实例成员也 ... -
clone() 方法
2013-03-11 13:54 762在应用开发过程中,我们可能会需要拷贝(copy)一个现有的 ... -
多线程实现方法
2013-03-06 11:05 698两种实现方法: 继承Thread类, 实现Runna ... -
Polymorphism classic example
2012-07-27 16:01 859The classic example in OOP is t ... -
Java Regular Expressions
2012-07-02 20:51 842使用正则表达式可以方便地对数据进行匹配,还可以 执行更加复杂的 ...
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