Java学生信息增删改查（并没用数据库）

一个泛型的应用，Java版本增删改查，写的简陋，望批评指正

2016-07-02

很久前写的一个程序了。拿出来存一下，不是为了展示啥，自己用的时候还可以看看。写的很粗糙。

 import java.io.BufferedReader;
 import java.io.File;
 import java.io.FileNotFoundException;
 import java.io.FileReader;
 import java.io.IOException;
 import java.util.Comparator;
 import java.util.HashMap;
 import java.util.HashSet;
 import java.util.Iterator;
 import java.util.Map;
 import java.util.Scanner;
 import java.util.Set;
 import java.util.TreeSet;

 public class studen  implements Comparable<studen>{
     public int id;
     public String name;
     public char sex;
     public String address;
     public int javascore;
     public int cscore;
     public int byscore;
     public int j2eescore;
     public int getId() {
         return id;
     }
     public void setId(int id) {
         this.id = id;
     }
     public String getName() {
         return name;
     }
     public void setName(String name) {
         this.name = name;
     }
     public char getSex() {
         return sex;
     }
     public void setSex(char sex) {
         this.sex = sex;
     }
     public String getAddress() {
         return address;
     }
     public void setAddress(String address) {
         this.address = address;
     }
     public int getJavascore() {
         return javascore;
     }
     public void setJavascore(int javascore) {
         this.javascore = javascore;
     }
     public int getCscore() {
         return cscore;
     }
     public void setCscore(int cscore) {
         this.cscore = cscore;
     }
     public int getByscore() {
         return byscore;
     }
     public void setByscore(int byscore) {
         this.byscore = byscore;
     }
     public int getJ2eescore() {
         return j2eescore;
     }
     public void setJ2eescore(int j2eescore) {
         this.j2eescore = j2eescore;
     }
     public void setall(int id, String name,char sex,String address,int javascore,int cscore, int byscore,int j2eescore)
     {
         this.id=id;
         this.address=address;
         this.name=name;
         this.byscore=byscore;
         this.cscore=cscore;
         this.j2eescore=j2eescore;
         this.sex=sex;
         this.javascore=javascore;
     }

     @Override
     public String toString() {
         return "studen [id=" + id + ", name=" + name + ", sex=" + sex
                 + ", address=" + address + ", javascore=" + javascore
                 + ", cscore=" + cscore + ", byscore=" + byscore
                 + ", j2eescore=" + j2eescore + "]";
     }

     public static void main(String[] args) {
         // TODO Auto-generated method stub
         Set<studen> A=new HashSet<studen>();
         ////

         /////
          File file = new File("infor.txt");
          if(file.exists()&&file.isFile())
          {
              try {
                 FileReader read=new FileReader("infor.txt");
                 BufferedReader  re=new BufferedReader (read);
                 String str;
                 while((str=re.readLine())!=null)
                 {
                     //System.out.println(str);

                     String arr[]=str.split(" ");
                     studen st=new studen();
                     st.setId(Integer.parseInt(arr[0]));
                     st.setName(arr[1]);
                     st.setSex(arr[2].charAt(0));
                     st.setAddress(arr[3]);
                     st.setJavascore(Integer.parseInt(arr[4]));
                     st.setJavascore(Integer.parseInt(arr[5]));
                     st.setByscore(Integer.parseInt(arr[6]));
                     st.setJ2eescore(Integer.parseInt(arr[7]));
                     System.out.println(st.toString());
                     A.add(st);

                     //System.out.println();
                 }

                 for(Iterator<studen> it=A.iterator();it.hasNext();)
                 {
                     String ss=it.next().toString();
                     System.out.println("HashSet1***:"+ss+" ");
                 }
             } catch (FileNotFoundException e) {
                 // TODO Auto-generated catch block
                 System.out.print("can not read the txt");
                 e.printStackTrace();
             } catch (IOException e) {
                 // TODO Auto-generated catch block
                 e.printStackTrace();
             }

              }
          //插入一个新的student对象给集合SET
          System.out.print("插入一个学生 2, GOQI, f,beijing, 90, 89, 78,94:");
          studen stu2=new studen();
         stu2.setall(2, "GOQI", 'f',"beijing", 90, 89, 78,94);
         A.add(stu2);
         TreeSet<studen> ts=new TreeSet<studen>();
         for(Iterator<studen> it=A.iterator();it.hasNext();)
         {
         studen cad=it.next();
             ts.add(cad);
         }
         for(Iterator<studen> it2=ts.iterator();it2.hasNext();)
         {
             System.out.println("Treeset(按ID排序结果):"+it2.next().toString());
         }
         //serach student
         System.out.println("输入待查学生姓名：");
         Scanner cin=new Scanner(System.in);
         if(cin.hasNext())
         {
             String name=cin.next();
             studen s1=new studen();

             ///?
             int flage=0;
             studen Temp;
             for(Iterator<studen> it=A.iterator();it.hasNext();)
             {
                 Temp = it.next();
                 if(Temp .getName().equals(name))
                 {
                     flage=1;
                     System.out.println("exist this student.");
                     System.out.println("该生信息为："+Temp.toString());
                     break;
                 }
                 else
                 {
                     ;
                 }
             }
             if(flage==0)
             {
                 System.out.println("Not exist this student.");
             }
         }
         //删除学生

         System.out.println("输入待删除学生姓名：");
         Scanner cin2=new Scanner(System.in);
         if(cin2.hasNext())
         {
             String name2=cin2.next();

             int flage=0;
             studen Temp;
             for(Iterator<studen> it=A.iterator();it.hasNext();)
             {
                 Temp = it.next();
                 if(Temp .getName().equals(name2))
                 {
                     flage=1;
                     it.remove();
                     System.out.println("removed this student.");

                     break;
                 }

             }
             if(flage==0)
             {
                 System.out.println("Not exist this student so we can not remove it.");
             }
         }
       //map
         Map<Integer,TreeSet<studen>> map=new HashMap<Integer, TreeSet<studen>>();
         TreeSet<studen> tm0=new TreeSet<studen>();
         TreeSet<studen> tm1=new TreeSet<studen>();
         TreeSet<studen> tm2=new TreeSet<studen>();
         TreeSet<studen> tm3=new TreeSet<studen>();
         TreeSet<studen> tm4=new TreeSet<studen>();
         Iterator<studen> treeit=ts.iterator();

         studen sno=new studen();
         //将学生信息按照%5ID对应treeset 依次放入。
         while(treeit.hasNext())
         {
             sno=(studen) treeit.next();
             if(sno.getId()%5==0)
             {
                 tm0.add(sno);
             }
             else if(sno.getId()%5==1)
             {
                 tm1.add(sno);
             }
             else if(sno.getId()%5==2)
             {
                 tm2.add(sno);
             }
             else if(sno.getId()%5==3)
             {
                 tm3.add(sno);
             }
             else
             {
                 tm4.add(sno);
             }
         }

         map.put(0,tm0);
         map.put(1,tm1);
         map.put(2,tm2);
         map.put(3,tm3);
         map.put(4,tm4);
         ////print map
         System.out.println("map id:0~4(%5):");
             for(Object o : map.keySet()){  

                System.out.println( "map输出："+map.get(o).size()+"个:"+map.get(o).toString()); }
     }//main

     @Override
     public int hashCode() {
         final int prime = 31;
         int result = 1;
         result = prime * result + id;
         return result;
     }
     @Override
     public boolean equals(Object obj) {
         if (this == obj)
             return true;
         if (obj == null)
             return false;
         if (getClass() != obj.getClass())
             return false;
         studen other = (studen) obj;
         if (id != other.id)
             return false;
         System.out.println("!!!id 重复无法插入,重复ID为："+id);
         return true;
     }
     @Override
     public int compareTo(studen o) {
         // TODO Auto-generated method stub
         int result=this.getId()>o.getId()?1:
             (this.getId()==o.getId()?0:-1);
         return result;
     }

 }

也是泛型的应用