PriorityQueue ，ArrayList ， 数组排序

 static class E implements Comparable<E>{
                     int x ;
                     int y ;
                     int state ;
                     int money ;
                     public E(int x , int y , int state , int money){
                                 this.x  = x ;
                                 this.y = y ;
                                 this.state = state ;
                                 this.money = money ;
                     }

                    @Override
                    public int compareTo(E o) {
                                return money - o.money ;
                    }
          } 

PriorityQueue<E> q = new PriorityQueue<E>() ;
                        q.add(new E(1, 0, 0, 1)) ;
                        q.add(new E(2, 0, 0, 3)) ;
                        q.add(new E(3, 0, 0, 2)) ;
                        q.add(new E(4, 0, 0, 5)) ;
                        q.add(new E(5, 0, 0, 9)) ;
                        while(! q.isEmpty()){
                                System.out.println(q.poll().money) ;
                        }

输出结果：
1
2
3
5
9

ArrayList<E> q = new ArrayList<E>() ;
                        q.add(new E(1, 0, 0, 1)) ;
                        q.add(new E(2, 0, 0, 3)) ;
                        q.add(new E(3, 0, 0, 2)) ;
                        q.add(new E(4, 0, 0, 5)) ;
                        q.add(new E(5, 0, 0, 9)) ;

                        Collections.sort(q) ;
                        for(E e : q){
                                System.out.println(e.money) ;
                        }

输出结果：
1
2
3
5
9

  E[] q = new E[100]  ;
                        q[0] = new E(1, 0, 0, 1) ;
                        q[1] = new E(2, 0, 0, 3) ;
                        q[2] = new E(3, 0, 0, 2) ;
                        q[3] = new E(4, 0, 0, 5) ;
                        q[4] = new E(5, 0, 0, 9) ;

                        Arrays.sort(q , 0 , 5) ;
                        for(int i = 0 ; i < 5 ; i++){
                                System.out.println(q[i].money) ;
                        }
输出结果：
1
2
3
5
9

          static class E{
                     int x ;
                     int y ;
                     int state ;
                     int money ;
                     public E(int x , int y , int state , int money){
                                 this.x  = x ;
                                 this.y = y ;
                                 this.state = state ;
                                 this.money = money ;
                     }
          } 

ArrayList<E> q = new ArrayList<E>() ;
              q.add(new E(1, 0, 0, 1)) ;
              q.add(new E(2, 0, 0, 3)) ;
              q.add(new E(3, 0, 0, 2)) ;
              q.add(new E(4, 0, 0, 5)) ;
              q.add(new E(5, 0, 0, 9)) ;

              Collections.sort(q ,   new Comparator<E>() {
                  @Override
                    public int compare(E a , E b) {
                                return a.money - b.money ;
                    }
               }
              ) ;

              for(E e : q){
                                System.out.println(e.money) ;
             }
输出结果：
1
2
3
5
9

 E[] q = new E[100]  ;
            q[0] = new E(1, 0, 0, 1) ;
            q[1] = new E(2, 0, 0, 3) ;
            q[2] = new E(3, 0, 0, 2) ;
            q[3] = new E(4, 0, 0, 5) ;
            q[4] = new E(5, 0, 0, 9) ;

            Arrays.sort(q, 0, 5, new Comparator<E>() {
                @Override
                public int compare(E a, E b) {
                            return  a.money - b.money ;
                }
            }) ;

              for(int i = 0 ; i < 5  ; i++){
                                System.out.println(q[i].money) ;
             }
输出结果：
1
2
3
5
9

 PriorityQueue<E> q = new PriorityQueue<E>(1 , new Comparator<E>() {
                  @Override
                    public int compare(E a , E b) {
                                return a.money - b.money ;
                    }
               }) ;
              q.add(new E(1, 0, 0, 1)) ;
              q.add(new E(2, 0, 0, 3)) ;
              q.add(new E(3, 0, 0, 2)) ;
              q.add(new E(4, 0, 0, 5)) ;
              q.add(new E(5, 0, 0, 9)) ;
              while(! q.isEmpty()){
                                System.out.println(q.poll().money) ;
             }

输出结果：
1
2
3
5
9