【案例6-2】 學(xué)生管理系統(tǒng)

【案例介紹】
1.任務(wù)描述
編寫一個程序，模擬學(xué)生管理系統(tǒng)。可以實現(xiàn)對學(xué)生信息的添加、刪除、修改和查詢功能，要求使用List集合存儲自定義的對象集合，并熟練使用List集合的中常用方法實現(xiàn)相關(guān)的操作。

StudentSysTest.java

package com.j2se.myInstances.example6_2;import java.util.ArrayList; import java.util.Iterator; import java.util.List; import java.util.Scanner;public class StudentSysTest {public static void main(String[] args) {Scanner sc = new Scanner(System.in);List<Student> list = new ArrayList<>();while (true) {printInfo();switch (sc.nextInt()) {case 1:addStudent(list);break;case 2:deleteStudent(list);break;case 3:updateStudent(list);System.out.println("修改學(xué)生");break;case 4:showStudent(list);break;case 5:System.out.println("退出系統(tǒng)");System.exit(0);break;default:System.out.println("輸入有誤，請重新輸入！");break;}}}private static void updateStudent(List<Student> list) {Scanner sc = new Scanner(System.in);System.out.println("請輸入要刪除的學(xué)生的學(xué)號：");long sno = sc.nextLong();int idx = -1;for (int i = 0; i<list.size(); i++) {Student s = list.get(i);if (s.getSno() == sno) {idx = i;break;}}if (idx != -1) {Student s = new Student();System.out.println("修改姓名：");String name = sc.next();s.setName(name);System.out.println("修改年齡：");int age = sc.nextInt();s.setAge(age);System.out.println("修改地址：");String address = sc.next();s.setAddress(address);list.set(idx, s);System.out.println("修改完成！\n");}else {System.out.println("沒有這號人，請重新操作！\n");}}private static void deleteStudent(List<Student> list) {Scanner sc = new Scanner(System.in);System.out.println("請輸入要刪除的學(xué)生的學(xué)號：");long sno = sc.nextLong();int idx = -1;for (int i=0; i<list.size();i++) {Student stu = list.get(i);if (sno == stu.getSno()) {idx = i;break;}}if (idx != -1) {System.out.println("刪除成功！\n");list.remove(idx);} else {System.out.println("沒有這號人！請重新選擇！");}}private static void showStudent(List<Student> list) {boolean empty = isEmpty(list);if (empty) {System.out.println("暫無數(shù)據(jù)，請先添加學(xué)生數(shù)據(jù)。\n");return;} else {for (Student student : list) {System.out.println(student.getSno() + ", " + student.getName() + ", " + student.getAge() + ", " + student.getAddress());}System.out.println();}}private static boolean isEmpty(List<Student> list) {if (list.isEmpty())return true;else return false;}private static void addStudent(List<Student> list) {Student s = new Student();Scanner sc = new Scanner(System.in);long sno;while (true) {System.out.print("學(xué)號：");sno = sc.nextLong();boolean flag = false;for (Student stu : list) {if (sno == stu.getSno()) {flag = true;break;}}if (flag) {System.out.println("學(xué)號重復(fù)了!請重新輸入:");} else {System.out.print("姓名：");String name = sc.next();System.out.print("年齡：");int age = sc.nextInt();System.out.print("地址：");String address = sc.next();s.setSno(sno);s.setName(name);s.setAge(age);s.setAddress(address);list.add(s);System.out.println("添加完成！\n");break;}}}public static void printInfo() {System.out.println("\t學(xué)生信息管理系統(tǒng)\t");System.out.println("1. 添加學(xué)生");System.out.println("2. 刪除學(xué)生");System.out.println("3. 修改學(xué)生");System.out.println("4. 查看學(xué)生");System.out.println("5. 退出系統(tǒng)");System.out.println("請輸入你的選擇：");} }

Student.java

package com.j2se.myInstances.example6_2;public class Student {private long sno;private String name;private int age;private String address;public Student() {}public Student(long sno, String name, int age, String address) {this.sno = sno;this.name = name;this.age = age;this.address = address;}public long getSno() {return sno;}public void setSno(long 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 getAddress() {return address;}public void setAddress(String address) {this.address = address;} }

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