import?java.util.linkedList;
import?java.util.Random;



public?class?ProcessMemoryController?{

????int?NUM?=?10;//進程數
????int?ACCURACY?=?1;//控制格式化后小數點后面的位數
????int?THRESHOLD?=?5;//允許并發的進程數量，小于時從后備隊列調入進程
????int?MINSIZE?=?30;//控制內存碎片的產生

????PCB[]?pcb?=?new?PCB[NUM];
????linkedList?memoList?=?new?linkedList<>（）;

????double?pTime;?????//時間片定義
????int?run;???????//當前運行的進程，沒有則為-1
????long?lastTime;??//每次調度程序都記錄當前時間
????long?beginTime;//程序開始時間

????//進程PCB塊類
????private?class?PCB?{
????????String?name;???????//進程名
????????double?arrtime;????//到達時間
????????double?needtime;???//需要運行時間
????????double?usedtime;???//已用時間
????????int?needmemo;??????//所需內存
????????int?address;???????//主存起始位置
????????char?state;????????//進程狀態
????}
????//內存條目類
????private?class?MemoItem?{
????????//內存表條目
????????int?address?=?0;
????????int?length?=?0;
????????char?state?=?‘F‘;//B代表busy繁忙或F代表free空閑

????????public?MemoItem（int?address?int?length）?{
????????????this.address?=?address;
????????????this.length?=?length;
????????}
????}
????//定義bool類型的所有進程調度結束函數
????boolean?isAllFinished（）?{
????????for?（int?i?=?0;?i?????????????if?（pcb[i].state?!=?‘F‘）?return?false;
????????}
????????return?true;
????}
????//初始化各個參數
????void?init（）?{
????????run?=?-1;

????????Random?r?=?new?Random（）;

????????for?（int?n?=?0;?n?????????????pcb[n]?=?new?PCB（）;
????????????pcb[n].name?=?Character.toChars（65?+?n）[0]?+?““;
????????????pcb[n].needtime?=?r.nextDouble（）?*?2?+?3;//2到5秒
????????????pcb[n].needmemo?=?r.nextInt（200）?+?250;//需要的內存為200到450


????????????if?（n?==?0）?{
????????????????pcb[n].arrtime?=?0;
????????????????pcb[0].needmemo?=?50;
????????????}?else?{
????????????????pcb[n].arrtime?=?r.nextDouble（）?*?5?+?1;
????????????????pcb[n].needmemo?=?r.nextInt（300）?+?150;//需要的內存為300到450
????????????}
????????}
????????for?（int?n?=?0;?n?????????????pcb[n].usedtime?=?0;
????????????pcb[n].address?=?0;
????????????pcb[n].state?=?‘U‘;
????????}

????????//設置起始地址為30，初始化的長度在100到150之間
????????MemoItem?first?=?new?MemoItem（30?r.nextInt（100）?+?50）;
????????memoList.add（first）;
????????MemoItem?prev?=?first;
????????for?（;?;?）?{
????????????int?address?=?prev.address?+?prev.length;
????????????if?（address?>=?1024）?break;
????????????int?length?=?r.nextInt（50）?+?50;
????????????MemoItem?ano?=?new?MemoItem（address?length）;
????????????memoList.add（ano）;
????????????prev?=?ano;
????????}
????}
????//格式化輸出展示數據
????String?d2s（double?d）?{
????????String?tmp?=?d?+?““;
????????int?index?=?tmp.indexOf（“.“）;
????????return?tmp.substring（0?index?+?ACCURACY?+?1）;
????}
????//先來先服務時間排序
????void?sortByArrtime（）?{
????????int?i?j;
????????PCB?temp;
????????for?（i?=?0;?i?????????{
????????????for?（j?=?0;?j?????????????????if?（pcb[j?+?1].arrtime?????????????????????temp?=?pcb[j];
??????????