今さらjavaでsleepsort

今更すぎる感ありますが、sleepsortをjavaで実装しました。

class Sleepsort extends Thread{
    private int num;
    
    public ExThread1(int i) {
        num = i;
    }
    
  public void run() { 
    try {
        sleep(num);
        System.out.println(num);
    } catch (InterruptedException e) {
        e.printStackTrace();
    }
  }
  
  public static void sleepsort(int num[]) {
      
      for(int i=0;i<num.length;i++) {
          ExThread1 thread = new ExThread1(num[i]);
          
          thread.start();
      }
  }
 
  public static void main(String[] args){
      int num[] = {3,2,10,4};
      sleepsort(num);
  }
}