java priority queue

1PriorityQueue<E> pq = new PriorityQueue<E>();

1class TestMultiPriority1 extends Thread{  
2 public void run(){  
3   System.out.println("running thread name is:"+Thread.currentThread().getName());  
4   System.out.println("running thread priority is:"+Thread.currentThread().getPriority());  
5  
6  }  
7 public static void main(String args[]){  
8  TestMultiPriority1 m1=new TestMultiPriority1();  
9  TestMultiPriority1 m2=new TestMultiPriority1();  
10  m1.setPriority(Thread.MIN_PRIORITY);  
11  m2.setPriority(Thread.MAX_PRIORITY);  
12  m1.start();  
13  m2.start();  
14   
15 }  
16}     

1//Sol1
2PriorityQueue<Integer> queue = new PriorityQueue<>(10, Collections.reverseOrder());
3
4
5//Sol2
6// PriorityQueue<Integer> pq = new PriorityQueue<>((x, y) -> y - x);
7PriorityQueue<Integer> pq =new PriorityQueue<>((x, y) -> Integer.compare(y, x));
8
9
10//Sol3
11PriorityQueue<Integer> pq = new PriorityQueue<Integer>(defaultSize, new Comparator<Integer>() {
12    public int compare(Integer lhs, Integer rhs) {
13        if (lhs < rhs) return +1;
14        if (lhs.equals(rhs)) return 0;
15        return -1;
16    }
17});