实验七

源代码：

import java.util.Scanner;
public class Student {
    public int i=0;
 public String xing,name,zy,nj,address;
 public double date,score;
 public String xuehao;
 Scanner shuru=new Scanner(System.in);
 public Student(){}
 public Student(String xing,String name,String zy,String nj,String address,double date,double score)
 {
  this.xing=xing;
  this.name =name;
  this.zy=zy;
  this.nj=nj;
  this.address=address;
  this.date=date;
  this.score=score;
 }
 void name_chazhao(String temp) {
   System.out.println(name+" "+zy+" "+nj+" "+address+" "+date+" "+score+" "+xuehao);
 }
 void date_chazhao(double temp) {
    System.out.println(name +" "+zy+" "+nj+" "+address+" "+date+" "+score+" "+xuehao);
 }
 void address_chazhao(String temp) {
   System.out.println(name+" "+zy+" "+nj+" "+address+" "+date+" "+score+" "+xuehao);
 }
 public static void main(String[] args) {
  int i,j=1,t=1,w=0;
  int length;
  Student[] stu=new Student[5];//("李","李会通","网络工程","17级","海南万宁",1998,100);
  stu[0]=new Student("李","李会通","网络工程","17级","海南万宁",1998,100);
  stu[1]=new Student("钟","钟若文","网络工程","17级","广西南宁",1997,100);
  stu[2]=new Student("马","马元斌","网络工程","17级","青海西宁",1999,100);
  stu[3]=new Student("白","白云超","网络工程","17级","青海西宁",1999,100);
  stu[4]=new Student("牛","牛明旺","生物工程","17级","河北武安",1998,92);
  String temp=stu[0].zy;
  int []fuzhu=new int[100];
  String []zhuanye=new String[100];
  zhuanye[0]=stu[0].zy;
  length=stu.length;
  for(i=0;i<stu.length;i++){
   if(stu[i].zy!=temp){
    fuzhu[j]=j;
    zhuanye[j++]=stu[i].zy;
   }
  }
  for(i=0;i<length;i++){
   stu[i].xuehao="20";
   char [] stringArr =stu[i].zy.toCharArray();
   for(j=0;j<stringArr.length;j++){
    if(stringArr[j]>='0'&&stringArr[j]<='9'){
     stu[i].xuehao+=stringArr[j];
    }
    for(w=0;w<zhuanye.length;w++){
     if(stu[i].zy==zhuanye[w]){
      stu[i].xuehao+=fuzhu[w];
      break;
     }
    }
   }
   stu[i].xuehao+=t++;
  }
  Scanner shuru=new Scanner(System.in);
  int choice=1;
  while(choice!=0){
   System.out.println("0.退出系统 1.按姓名查找 2.按年份查找 3.按省市查找 4.统计成绩");
   System.out.println("请输入你的选择:");
   choice=shuru.nextInt();
  switch(choice){
  case 0:System.exit(0);
  case 1:System.out.println("请输入查找的姓:");
  temp=shuru.next();
  for(i=0;i<stu.length;i++) {
      if(stu[i].xing.equals(temp)){
   stu[i].name_chazhao(temp);
      break;
      }
  }//for循环的括号
  break;
  case 2:System.out.println("请输入查找的年份:");
  double temp2=shuru.nextDouble();
  for(i=0;i<stu.length;i++){
   if(stu[i].date==temp2) {
    stu[i].date_chazhao(temp2);
   }
  }
  break;
  case 3:System.out.println("请输入查找的省市:");
  temp=shuru.next();
  for(i=0;i<stu.length;i++){
   if(stu[i].address.contains(temp)==true) {
    stu[i].address_chazhao(temp);
   }
  }
  break;
  case 4:double []num=new double[300];
  for(i=0;i<300;i++){num[i]=0;}
  for(i=0;i<stu.length;i++){
   for(j=0;j<zhuanye.length;j++){
    if(stu[i].zy==zhuanye[j]){
     num[fuzhu[j]]+=stu[i].score;
    }
   }
  }
  for(i=0;i<num.length;i++){
   if(num[i]!=0){
   System.out.print(zhuanye[i]);
   System.out.println("班的总分是:"+num[i]);
   }
  }
  break;
  }//选择结构的括号
  }
 }
}