在另一个线程中启动和挂起一个线程

Question

class SalesPersons implements Runnable{
      String[] names ={"Shubham","Shreyanshi","Sanjay","Sujeet","Utsab"};
      public void run(){
            for(int loop=0;loop<names.length();loop++){
                syso(names[loop]);
            }
      }
 }
class Days implements Runnable{
      String[] days ={"Sat","Sun","Mon","Tue","Wed","Thu","Fri"};
      public void run(){
            SalesPersons sp_obj = new SalesPersons();
            Thread t2 = new Thread(sp_obj,"sales_persons");
            t2.start();
            for(int loop=0;loop<days.length();loop++){
               if(days[loop].equalsIgnoreCase("Sun"))
                  t2.suspend();
               if(days[loop].equalsIgnoreCase("Wed"))
                  t2.resume();
               syso(days[loop]);
            }
      }
      public static void main(String args[]){
          Days day_obj = new  Days();
          Thread t1 = new Thread(day_obj,"days");
          t1.start();
      }
 }

 Desired output: 
               Sat           <--|---Thread randomness but as per syso order
               Shubham       <--|   
               Sun           <--| 
               Mon              |---Fixed order
               Tue           <--|
               Wed           <--|
               Shreyanshi       |
               Sanjay           |
               Thu              |---Thread randomness but as per syso order 
               Fri              |
               Sujeet           |
               Utsab         <--|  

 Sometimes I am getting:

 Sample:1
 Sat
 Sun

 Sample:2
 Sat
 Shubham

 Sample:3
 Sat
 Shubham
 Sun

 Sample:4
 Sat

 Sample:5
 Sat
 Sun
 Mon
 Tue
 Wed

为什么？考虑到打印的随机性，应该打印12行，因为线程相互竞争。但是每次太阳照应该按照确切的顺序打印。我无法理解为什么我会在上面的示例输出中得到不需要的输出。