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