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
}
}
}
