package com.studentByArray.www;

public class Student {
 
 //定義一個(gè)Student類(lèi){學(xué)號(hào)、姓名、年齡、性別}
 private String Sno;
 
 private String name;
 
 private int age;
 
 private String sex;
 
 
 
 public Student() {
 super();
 // TODO Auto-generated constructor stub
 }

 public Student(String sno, String name, int age, String sex) {
 super();
 Sno = sno;
 this.name = name;
 this.age = age;
 this.sex = sex;
 }
 
 public String getSno() {
 return Sno;
 }
 public void setSno(String Sno) {
 this.Sno = Sno;
 }
 
 public String getName() {
 return name;
 }
 public void setName(String name) {
 this.name = name;
 }
 
 public int getAge() {
 return age;
 }
 public void setAge(int age) {
 this.age = age;
 }
 
 public String getSex() {
 return sex;
 }
 public void setSex(String sex) {
 this.sex = sex;
 }
 @Override
 public String toString() {
 return "Student [Sno=" + Sno + ", name=" + name + ", age=" + age + ", sex=" + sex + "]";
 } 
 

}

package com.studentByArray.www;

import java.util.ArrayList;

public class StudentOperate {
 
 ArrayList<Student> list = new ArrayList<Student>();
 
 //增加學(xué)生
 public boolean addStudent(Student student) {
 
 for(int i=0;i<list.size();i++) {
 Student s = list.get(i);
 if(s.getSno().equals(student.getSno())) {
 
 return false;
 
 }else {
 list.add(student);
 return true;
 }
 
 }
 list.add(student);
 return true;
 }
 
 //查看學(xué)生信息
 public void showStudent() {
 if(list.size() == 0) {
 System.out.println("沒(méi)有學(xué)生信息");
 }
 for(Student stu : list) {
 System.out.println("學(xué)生學(xué)號(hào)： "+stu.getSno()+" "+"學(xué)生姓名： "+stu.getName()+" "+"學(xué)生年齡： "+stu.getAge()+" "+"學(xué)生性別： "+stu.getSex());
 }
 }
 
 //根據(jù)學(xué)號(hào)修改學(xué)生信息
 public boolean updataBySno(Student student) {
 if(student.getSno() == null) {
 return false;
 }
 for(int i=0;i<list.size();i++) {
 Student s = list.get(i);
 if(s.getSno().equals(student.getSno())) {
 s.setName(student.getName());
 s.setAge(student.getAge());
 s.setSex(student.getSex());
 return true;
 
 }
 }
 return false;
 }
 
 //根據(jù)學(xué)號(hào)查看某一個(gè)學(xué)生信息
 public Student showStuBySno(String sno) {
 if(sno == null) {
 return null;
 }
 for(int i=0;i<list.size();i++) {
 Student s = list.get(i);
 if(s.getSno().equals(sno)) {
 return s;
 }
 }
 return null;
 }
 
 //根據(jù)性別查看同性別的所有學(xué)生
 public ArrayList<Student> selectStuByAge(String sex) {
 ArrayList<Student> newStu = new ArrayList<Student>();
 for(int i=0;i<list.size();i++) {
 Student s = list.get(i);
 if(s.getSex().equals(sex)) {
 newStu.add(s);
 
 }
 }
 return newStu;
 }
 
 //根據(jù)學(xué)號(hào)刪除某一個(gè)學(xué)生
 public boolean deleteBySno(String sno) {
 Student stu = this.showStuBySno(sno);
 if(stu!=null) {
 list.remove(stu);
 return true;
 }
 return false;
 
 
 }
 
 //按照學(xué)號(hào)升序排序(默認(rèn))
 public ArrayList<Student> sortBySno() {
 for(int i=0;i<list.size()-1;i++) {
 for(int j=0;j<list.size()-1-i;j++) {
 if(list.get(j).getSno().compareTo(list.get(j+1).getSno())>0) {
 Student temp = list.get(j);
 list.set(j, list.get(j+1));
 list.set(j+1, temp);
 
 }
 
 }
 
 }
 return list;
 
 
 }
 
 //按照年齡降序排序
 public ArrayList<Student> sortByAge() {
 for(int i=0;i<list.size()-1;i++) {
 for(int j=0;j<list.size()-1-i;j++) {
 if(list.get(j).getAge()<list.get(j+1).getAge()) {
 Student temp = list.get(j);
 list.set(j, list.get(j+1));
 list.set(j+1, temp);
 }
 }
 
 }
 return list;
 }

}

package com.studentByArray.www;

import java.util.ArrayList;
import java.util.Scanner;

public class StudentTest {
 public static void main(String[] args) {
 
 StudentOperate stuO = new StudentOperate();
 Scanner input = new Scanner(System.in);
 boolean choose = true;
 while(choose) {
 System.out.println("1.增加學(xué)生");
 System.out.println("2.查看學(xué)生");
 System.out.println("3.根據(jù)學(xué)號(hào)修改學(xué)生信息");
 System.out.println("4.根據(jù)學(xué)號(hào)查看某一個(gè)學(xué)生信息");
 System.out.println("5.根據(jù)性別查看同性別的所有學(xué)生");
 System.out.println("6.根據(jù)學(xué)號(hào)刪除某一個(gè)學(xué)生");
 System.out.println("7.按照學(xué)號(hào)升序排序(默認(rèn))");
 System.out.println("8.按照年齡降序排序");
 System.out.print("請(qǐng)輸入你的選擇：");
 int i = input.nextInt();
 switch(i){
 case 1:
 {
 System.out.println("請(qǐng)輸入你要增加的學(xué)生學(xué)號(hào)：");
 String sno = input.next();
 System.out.println("請(qǐng)輸入要增加的學(xué)生姓名：");
 String name = input.next();
 System.out.println("請(qǐng)輸入要增加的學(xué)生年齡：");
 int age = input.nextInt();
 System.out.println("請(qǐng)輸入要增加的學(xué)生性別：");
 String sex = input.next();
 Student stu = new Student();
 stu.setSno(sno);
 stu.setName(name);
 stu.setAge(age);
 stu.setSex(sex);
 
 boolean receive = stuO.addStudent(stu);
 if(receive) {
 System.out.println("添加成功！");
 }else {
 System.out.println("輸入的學(xué)號(hào)已存在！");
 }
 System.out.println("請(qǐng)問(wèn)是否繼續(xù)：(true/false)");
 choose = input.nextBoolean();
 break;
 }
 case 2:
 {
 stuO.showStudent();
 System.out.println("請(qǐng)問(wèn)是否繼續(xù)：(true/false)");
 choose = input.nextBoolean();
 break;
 }
 case 3:
 {
 System.out.println("請(qǐng)輸入你要修改的學(xué)生學(xué)號(hào)：");
 String sno = input.next();
 System.out.println("將學(xué)生姓名改為：");
 String name = input.next();
 System.out.println("將學(xué)生年齡改為：");
 int age = input.nextInt();
 System.out.println("將學(xué)生性別改為：");
 String sex = input.next();
 Student stu = new Student();
 stu.setSno(sno);
 stu.setName(name);
 stu.setAge(age);
 stu.setSex(sex);
 
 boolean receive = stuO.updataBySno(stu);
 if(receive) {
 System.out.println("修改成功！");
 }else {
 System.out.println("修改失?。?);
 }
 System.out.println("請(qǐng)問(wèn)是否繼續(xù)：(true/false)");
 choose = input.nextBoolean();
 break;
 
 
 }
 case 4:
 {
 System.out.println("請(qǐng)輸入要查詢的學(xué)生學(xué)號(hào)：");
 String sno = input.next();
 Student receive = stuO.showStuBySno(sno);
 if(receive!=null) {
 
// String stu = receive.toString();
 System.out.println(receive);
 }else {
 System.out.println("沒(méi)有查詢到此學(xué)生！");
 }
 System.out.println("請(qǐng)問(wèn)是否繼續(xù)：(true/false)");
 choose = input.nextBoolean();
 break;
 }
 case 5:
 {
 System.out.println("請(qǐng)輸入你要查詢的學(xué)生性別：");
 String sex = input.next();
 ArrayList<Student> newStu= stuO.selectStuByAge(sex);
 System.out.println(newStu);
 System.out.println("請(qǐng)問(wèn)是否繼續(xù)：(true/false)");
 choose = input.nextBoolean();
 break;
 }
 case 6:
 {
 System.out.println("請(qǐng)輸入要?jiǎng)h除的學(xué)生學(xué)號(hào)：");
 String sno = input.next();
 boolean receive = stuO.deleteBySno(sno);
 if(receive) {
 System.out.println("刪除成功！");
 }else {
 System.out.println("刪除失?。?);
 }
 System.out.println("請(qǐng)問(wèn)是否繼續(xù)：(true/false)");
 choose = input.nextBoolean();
 break;
 }
 case 7:
 {
 ArrayList<Student> stus = stuO.sortBySno();
 System.out.println(stus);
 System.out.println("請(qǐng)問(wèn)是否繼續(xù)：(true/false)");
 choose = input.nextBoolean();
 break;
 }
 case 8:
 {
 ArrayList<Student> stus = stuO.sortByAge();
 System.out.println(stus);
 System.out.println("請(qǐng)問(wèn)是否繼續(xù)：(true/false)");
 choose = input.nextBoolean();
 break;
 }
 
 }
 }
 
 
 }

}