allprocess.java

可变分区存储模拟系统-为课程设计用的。操作系统

import java.util.*;

class AllProcess {
    private ArrayList PS; //进程表
    private static AllProcess All = null; //类的单例
    private AllProcess() {
        PS = new ArrayList();
    } //私有构造函数

    public static synchronized AllProcess getInstence() {
        if (All == null)
            All = new AllProcess();
        return All;

    } //获取类的唯一实例

    public void add(process newP) {
        if(PS.size()==0){PS.add(0,newP);return;}
        int i;
        for(i=0;i<PS.size();i++){
            process p=(process)PS.get(i);
            if(p.getStart()>newP.getStart()){
                PS.add(i,newP);
                return;
            }
        }
        PS.add(newP);

    } //添加新进程


    public void removeByName(String name) {
        int i;
        process p = null;
        for (i = 0; i < PS.size(); i++) {
            p = (process) PS.get(i);
            if (p.getName().equals(name))
                PS.remove(i);

        }
    } //按name删除
    public void removeByStart(int start) {
       int i;
       process p = null;
       for (i = 0; i < PS.size(); i++) {
           p = (process) PS.get(i);
           if (p.getStart()==start)
               PS.remove(i);

       }
   } //按name删除

    public process getByName(String name) {
        int i;
        process p = null;
        for (i = 0; i < PS.size(); i++) {
            p = (process) PS.get(i);
            if (p.getName().equals(name))
                return p;

        }
        return p;

    } //按Name获取

    public int size() {
        return PS.size();
    }

    public void clear() {
        PS.clear();
    }

    public process getByorder(int i) {
        if (i < PS.size()) {
            return (process) PS.get(i);
        } else
            return null;
    }
    public void setByorder(int h,process p){PS.set(h,p);}


}