模擬網路延時

package com.yeyue.demo01;
​
//模擬網路延時，放大問題的發生性
public class TestSleep1 implements Runnable{
​
  //票數
  private int ticketNums =10;
​
  @Override
  public void run() {
    while (true){
      if(ticketNums <= 0){
        break;
       }
      try {
        Thread.sleep(200);
       } catch (InterruptedException e) {
        e.printStackTrace();
       }
      System.out.println(Thread.currentThread().getName()+"-->拿到了第"+ticketNums--+"票");
     }
   }
​
  public static void main(String[] args) {
    TestThread4 ticket = new TestThread4();
​
    new Thread(ticket,"小明").start();
    new Thread(ticket,"老師").start();
    new Thread(ticket,"黃牛黨").start();
   }
}
 

模擬倒計時

package com.yeyue.demo01;
​
public class TestSleep2 {
​
  public static void main(String[] args) {
    try {
      tenDown();
     } catch (InterruptedException e) {
      e.printStackTrace();
     }
   }
​
  public static void tenDown () throws InterruptedException {
    int num = 10;
    while (true){
      Thread.sleep(1000);
      System.out.println(num--);
      if(num<=0){
        break;
       }
     }
   }
}
 

實時獲取當前時間

package com.yeyue.demo01;
​
import java.text.SimpleDateFormat;
import java.util.Date;
​
public class TestSleep2 {
​
  public static void main(String[] args) {
    Date startTime = new Date(System.currentTimeMillis()); //獲取當前系統時間
​
    while(true){
      try {
        Thread.sleep(1000);
        System.out.println(new SimpleDateFormat("HH:mm:ss").format(startTime));
        startTime = new Date(System.currentTimeMillis()); //更新當前時間
       } catch (InterruptedException e) {
        e.printStackTrace();
       }
     }
   }
​
  public static void tenDown () throws InterruptedException {
    int num = 10;
    while (true){
      Thread.sleep(1000);
      System.out.println(num--);
      if(num<=0){
        break;
       }
     }
   }
}