luxin120的博客

package com.luxin; import com.mongodb.BasicDBObject; import com.mongodb.MongoClient; import com.mongodb.client.FindIterable; import com.mongodb.client.MongoCollection; import com.mongodb.client.Mong...

1、CountDownLatch介绍： CountDownLatch：让一些线程阻塞直到另一些线程完成一系列操作后才被唤醒。 CountDownLatch主要有两个方法，当一个或多个线程调用await方法时，调用线程会被阻塞。其它线程调用countDown方法会将计数器减1(调用countDown方法的线程不会阻塞),当计数器的值变为零时，因调用await方法被阻塞的线程会被唤醒，继续执行。 ...

import java.awt.Color; import java.awt.Font; import java.awt.Graphics; import java.awt.image.BufferedImage; import java.io.File; import java.io.IOException; import java.util.Random; import javax.ima...

public class Producers_Consumers { public static void main(String[] args) { //共同资源 Food food = new Food(); //多线程 Producers p = new Producers(food); Consumers c = new Consumers(food); ne...

import java.util.Scanner; public class Main { public static void main(String[] args) { System.out.println("请输入一个整数："); Scanner input = new Scanner(System.in); int n = input.nextInt(); w...

1.产生死锁： public class LockThread { private static final Object lock1 = new Object(); private static final Object lock2 = new Object(); public static void main(String[] args) { Thread t1 = new...

1. 顾客类（顾客所在的桌号、顾客人数、点的菜品） import java.util.ArrayList; import java.util.List; public class Customers { private int count; //人数 private int tableID; //桌号 private List&l...

import java.util.Scanner; /* * 星期计算公式 * yearDays = getYearDays(year, month, day); * week = (year-1+(year-1)/4-(year-1)/100+(year-1)/400+yearDays)%7; */ public class Print_Calendar { public stat...

所需要的jar包： mail.jar import java.security.GeneralSecurityException; import java.util.Properties; import javax.mail.*; import javax.mail.internet.*; import javax.mail.internet.MimeMessage.RecipientType;...