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：12359ArrayList<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：12359  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：12359          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：12359 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：12359 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：12359