public class StudentInformation {


Scanner input=new Scanner(System.in);

ArrayList<Student> list=new ArrayList<Student>();

public void start(){

System.out.println("功能選單如下：");
System.out.println("1.錄入學員資訊");
System.out.println("2.根據學號查詢學員資訊");
System.out.println("3.修改學員資訊");
System.out.println("4.根據學號刪除學員資訊");
System.out.println("5.統計學員平均考試成績");
System.out.println("6.退出系統");
System.out.println("-------------------");
System.out.println("請選擇：");

String index=input.next();

if("1".equals(index)){
//錄入學員資訊
save();
}else if("2".equals(index)){
//根據學號查詢學員資訊
search();
}else if("3".equals(index)){
//修改學員資訊
modify();
}else if("4".equals(index)){
//根據學號刪除學員資訊
remove();
}else if("5".equals(index)){
//統計學員平均考試成績
average();
}else if("6".equals(index)){
//退出系統
System.exit(0);
}else{
System.out.println("輸入錯誤，請重新輸入！");
}

start();

}


/**
* 統計學員平均考試成績
*/
private void average() {
int sum=0;
for(int i=0;i<list.size();i++){
Student s=list.get(i);
sum+=s.getScore();
}
float ave=sum/list.size();
System.out.println("學員平均成績為："+ave);

}


/**
* 根據學號刪除學員資訊
*/
private void remove() {
System.out.println("輸入要刪除學員的學號：");
String num=input.next();

for (int i = 0; i < list.size(); i++) {
Student s=list.get(i);
if(s.getStudentNum().equals(num)){
list.remove(s);
System.out.println("刪除成功！");
}
}

}


/**
* 修改學員資訊
*/
private void modify() {
System.out.println("輸入要修改的學員學號：");
String num=input.next();

for (int i = 0; i < list.size(); i++) {
Student s=list.get(i);
if(s.getStudentNum().equals(num)){


System.out.println("輸入新學員姓名：");
String name=input.next();
System.out.println("輸入新學員年齡：");
int age=input.nextInt();
System.out.println("輸入新學員成績：");
int score=input.nextInt();

s.setName(name);
s.setAge(age);
s.setScore(score);

System.out.println("修改成功！");

}
}


}




/**
* 根據學號查詢學員資訊
*/
private void search() {
System.out.println("請輸入學號：");
String num=input.next();


Student s=null;
for(Student stu:list){


if(stu.getStudentNum().equals(num)){
s=stu;
break;
}

}
if(s!=null){
System.out.println("學號："+s.getStudentNum());
System.out.println("姓名："+s.getName());
System.out.println("年齡："+s.getAge());
System.out.println("成績："+s.getScore());
}else{
System.out.println("該學號不存在！");
}
 
/*
Student s=null;
    for(int i=0;i<list.size();i++){
    s=list.get(i);
    if(s.getStudentNum().equals(num)){

System.out.println("學號"+"\t\t"+"姓名"+"\t\t"+"年齡"+"\t\t"+"成績");

StringBuffer sb=new StringBuffer();
//sb.append(s.getStudentNum()).append("\t\t").append(s.getName()).append("\t\t").append(s.getAge()).append("\t\t").append(s.getScore());
sb.append(s.getStudentNum()+"\t\t"+s.getName()+"\t\t"+s.getAge()+"\t\t"+s.getScore());
String str=sb.toString();
System.out.println(str);
}else {
System.out.println("該學號不存在！");
}
}*/

}


/**
* 錄入學員資訊
*/
private void save() {

System.out.println("請輸入學號：");
String num=input.next();
System.out.println("請輸入姓名：");
String name=input.next();
System.out.println("請輸入年齡：");
int age=input.nextInt();
System.out.println("請輸入成績：");
int score=input.nextInt();

Student s=new Student();
s.setStudentNum(num);
s.setName(name);
s.setAge(age);
s.setScore(score);

list.add(s);
System.out.println("資訊錄入成功！");

}

}