java中（优先队列）PriorityQueue的使用

import java.util.*;


public class test1 {

public static void PrintPr(Queue<?> queue){
while(queue.peek()!=null){
System.out.print(queue.remove()+" ");
}
System.out.println();
}
public static void main(String[] args) {
PriorityQueue<Integer> priorityQueue=new PriorityQueue<Integer>();
//优先级队列存放整型数字
Random random=new Random(47);
for(int i=0;i<10;i++){
priorityQueue.offer(random.nextInt(i+10));

}
PrintPr(priorityQueue);
////
List<Integer> ints=Arrays.asList(25,22,20,18,14,9,3,1,1,2,3,9,2,5,1,5,25,30,0,10);
priorityQueue.addAll(ints);
PrintPr(priorityQueue);

priorityQueue=new PriorityQueue<Integer>(ints.size(),Collections.reverseOrder());
priorityQueue.addAll(ints);
PrintPr(priorityQueue);

//优先级队列存放字符
String fact="UDJKKDJL WSAPLMAD IUJSAA ATHSHJ";
List<String> list=Arrays.asList(fact.split(""));
PriorityQueue<String> priorityQueueStrings=new PriorityQueue<String>(list);
PrintPr(priorityQueueStrings);

priorityQueueStrings=new PriorityQueue<String>(list.size(),Collections.reverseOrder());
priorityQueueStrings.addAll(list);
PrintPr(priorityQueueStrings);

//set去重在排序
Set<Character> set=new HashSet<Character>();
for(char c:fact.toCharArray()){
set.add(c);
}
PriorityQueue<Character> pQCharacters=new PriorityQueue<Character>(set);
PrintPr(pQCharacters);




}

}

结果：

0 1 1 1 1 1 3 5 8 14 
0 1 1 1 2 2 3 3 5 5 9 9 10 14 18 20 22 25 25 30 
30 25 25 22 20 18 14 10 9 9 5 5 3 3 2 2 1 1 1 0 
       A A A A A D D D H H I J J J J K K L L M P S S S T U U W 
W U U T S S S P M L L K K J J J J I H H D D D A A A A A        
  A D H I J K L M P S T U W