Java实现简易学籍管理系统

Java实现简易学籍管理系统

本文实例为大家分享了java实现简易学籍管理系统的具体代码，供大家参考，具体内容如下

1、我们先来讲讲什么是泛型化编程

package 学生管理系统;

import java.util.ArrayList;

import java.util.List;

/*

* 进行泛型化编程

* @autor：pcb

* */

public class TestGeneric {

//进行泛型化编程，规定类型。

public List courses;

public TestGeneric() {

this.courses = new ArrayList();

}

public void testAdd() {

CourseClass cr1 = new CourseClass("1","大学语文");

courses.add(cr1);

//泛型集合中不能添加规定意外的对象

//courses.add("能否添加一些奇怪的东西");

CourseClass cr2 = new CourseClass("2","Java基础");

courses.add(cr2);

}

public void testForEach() {

//进行泛型之后，可直接利用它规定的类型及其子类型直接进行访问

for(CourseClass cr:courses) {

System.out.println(cr.id+":"+cr.name);

}

}

//泛型集合可以添加泛型的子类型的对象实例

public void testChild() {

ChildCourse ccr = new ChildCourse();

ccr.id = "3";

ccr.name = "我是子类的课程实例对象";

courses.add(ccr);

}

//泛型必须使用包装类型进行创建,例如：int和integer

public void testBaic() {

List list = new ArrayList();

list.add(1);

System.out.println("基本类型必须使用包装类作为泛型！"+list.get(0));

}

public static void main(String[] args) {

TestGeneric tg = new TestGeneric();

tg.testAdd();

tg.testForEach();

tg.testChild();

tg.testForEach();

tg.testBaic();

//tg.testForEach();

}

}

2、我们开始进行管理系统的创建，创建一个学生类和一个课程类

package 学生管理系统;

import java.util.HashSet;

import java.util.Set;

public class StudentsClass implements Comparable {

public String id;

public String name;

public Set courses;

public StudentsClass(String id,String name){

this.id=id;

this.name=name;

this.courses=new HashSet();

}

@Override

public int hashCode() {

final int prime = 31;

int result = 1;

result = prime * result + ((name == null) ? 0 : name.hashCode());

return result;

}

@Override

public boolean equals(Object obj) {

if (this == obj)

return true;

if (obj == null)

return false;

if (!(obj instanceof StudentsClass))

return false;

StudentsClass other = (StudentsClass) obj;

if (name == null) {

if (other.name != null)

return false;

} else if (!name.equals(other.name))

return false;

return true;

}

public int compareTo(StudentsClass o) {

return this.id.compareTo(o.id);

}

}

package 学生管理系统;

public class CourseClass {

public String id;

public String name;

public CourseClass(String id,String name){

this.id=id;

this.name=name;

}

public CourseClass() {

}

@Override

public int hashCode() {

final int prime = 31;

int result = 1;

result = prime * result + ((name == null) ? 0 : name.hashCode());

return result;

}

@Override

public boolean equals(Object obj) {

if (this == obj)

return true;

if (obj == null)

return false;

if (!(obj instanceof CourseClass))

return false;

CourseClass other = (CourseClass) obj;

if (name == null) {

if (other.name != null)

return false;

} else if (!name.equals(other.name))

return false;

return true;

}

}

3、利用List进行增加课程，删除课程，修改课程等的操作

package 学生管理系统;

import java.util.ArrayList;

import java.util.Arrays;

import java.util.Iterator;

import java.util.List;

public class ListTest {

//创建

public List coursesToSelect;

//构造器

public ListTest(){

this.coursesToSelect = new ArrayList();

}

public void testAdd(){

//加课

CourseClass cr1 = new CourseClass("1","数据结构");

coursesToSelect.add(cr1);

CourseClass temp = (CourseClass)coursesToSelect.get(0);

System.out.println("添加了课程:"+temp.id+":"+temp.name);

CourseClass cr2 = new CourseClass("2","c语言");

coursesToSelect.add(0, cr2);

CourseClass temp2 = (CourseClass)coursesToSelect.get(0);

System.out.println("添加了课程:"+temp2.id+":"+temp2.name);

CourseClass[] Course={new CourseClass("3","离散数学"),new CourseClass("4","汇编语言")};

coursesToSelect.addAll(Arrays.asList(Course));

CourseClass temp3 = (CourseClass)coursesToSelect.get(2);

CourseClass temp4 = (CourseClass)coursesToSelect.get(3);

System.out.println("添加了两门课程："+temp3.id+":"+temp3.name+";"+temp4.id+":"+temp4.name);

CourseClass[] Course1= {new CourseClass("5","高等数学"),new CourseClass("6","大学英语")};

coursesToSelect.addAll(2, Arrays.asList(Course1));

CourseClass temp5 = (CourseClass)coursesToSelect.get(2);

CourseClass temp6 = (CourseClass)coursesToSelect.get(3);

System.out.println("添加了两门课程："+temp5.id+":"+temp5.name+";"+temp6.id+":"+temp6.name);

}

public void test() {

int size = coursesToSelect.size();

for(int i=0;i

//进行强制类型转化

CourseClass cr = (CourseClass)coursesToSelect.get(i);

System.out.println("课程"+i+":"+cr.id+":"+cr.name);

}

}

//迭代器输入方法

public void testIterator() {

Iterator it = coursesToSelect.iterator();

System.out.println("可选择的课程（通过迭代器访问）：");

while(it.hasNext()) {

CourseClass cr = (CourseClass) it.next();

System.out.println("课程"+":"+cr.id+":"+cr.name);

}

}

//利用foreach语句进行遍历

public void testForEach() {

System.out.println("可选择的课程（通过FOREACH访问）：");

for(Object obj:coursesToSelect) {

CourseClass cr = (CourseClass) obj;

System.out.println("课程"+":"+cr.id+":"+cr.name);

}

}

//进行修改操作

public void testModify() {

coursesToSelect.set(4, new CourseClass("7","毛概"));

}

//利用对象进行删除操作

public void testRmove1() {

System.out.println("通过对象进行删除");

CourseClass cr = (CourseClass) coursesToSelect.get(4);

System.out.println("我是课程："+cr.id+":"+cr.name);

coursesToSelect.remove(cr);

System.out.println("成功删除课程！！");

testForEach();

}

//利用索引值进行删除操作

public void testRmove2() {

// CourseClass cr = (CourseClass) coursesToSelect.getPDoBsgBIXD(4);

// System.out.println("我是课程："+cr.id+":"+cr.name);

System.out.println("通过索引值进行删除");

coursesToSelect.remove(4);

System.out.println("成功删除课程！！");

testForEach();

}

//进行删除，删除多位置的方法操作

public void testRmove3() {

System.out.println("删除4位置和5位置的课程");

CourseClass [] Course={(CourseClass) coursesToSelect.get(4),(CourseClass) coursesToSelect.get(5)};

//将Course数组转化成一个集合传递进去

coursesToSelect.removeAll(Arrays.asList(Course));

System.out.println("成功删除课程！！");

testForEach();

}

public static void main(String[] args) {

ListTest it = new ListTest();

it.testAdd();

it.test();

//it.testIterator();

//it.testForEach();

//it.testModify();

//it.testForEach();

//it.testRmove2();

it.testRmove3();

}

}

4、利用set集合进行删除，添加，查询操作

package 学生管理系统;

import java.util.ArrayList;

import java.util.Arrays;

import java.util.List;

import java.util.Scanner;

public class SetTest {

//创建

public List coursesToSelect;

//向屏幕读取

private Scanner console;

public StudentsClass student;

//进行构造

public SetTest() {

coursesToSelect = new ArrayList();

console = new Scanner(System.in);

}

public void testAdd(){

//加课

CourseClass cr1 = new CourseClass("1","数据结构");

coursesToSelect.add(cr1);

CourseClass temp = (CourseClass)coursesToSelect.get(0);

//System.out.println("添加了课程:"+temp.id+":"+temp.name);

CourseClass cr2 = new CourseClass("2","c语言");

coursesToSelect.add(0, cr2);

CourseClass temp2 = (CourseClass)coursesToSelect.get(0);

//System.out.println("添加了课程:"+temp2.id+":"+temp2.name);

CourseClass[] Course={new CourseClass("3","离散数学"),new CourseClass("4","汇编语言")};

coursesToSelect.addAll(Arrays.asList(Course));

CourseClass temp3 = (CourseClass)coursesToSelect.get(2);

CourseClass temp4 = (CourseClass)coursesToSelect.get(3);

//System.out.println("添加了两门课程："+temp3.id+":"+temp3.name+";"+temp4.id+":"+temp4.name);

CourseClass[] Course1= {new CourseClass("5","高等数学"),new CourseClass("6","大学英语")};

coursesToSelect.addAll(2, Arrays.asList(Course1));

CourseClass temp5 = (CourseClass)coursesToSelect.get(2);

CourseClass temp6 = (CourseClass)coursesToSelect.get(3);

//System.out.println("添加了两门课程："+temp5.id+":"+temp5.name+";"+temp6.id+":"+temp6.name);

}

public void testForEach() {

System.out.println("可选择的课程（通过FOREACH访问）：");

for(Object obj:coursesToSelect) {

CourseClass cr = (CourseClass) obj;

System.out.println("课程"+":"+cr.id+":"+cr.name);

}

}

//查询是否包含此课程

public void testListContains() {

CourseClass course = coursesToSelect.get(0);

System.out.println("取得课程："+course.name);

System.out.println("备选课程是否包含课程："+course.name+","

+coursesToSelect.contains(course));

System.out.println("请输入课程名称：");

String name = console.next();

CourseClass course2 = new CourseClass();

course2.name = name;

System.out.println("新创建课程："+course2.name);

System.out.println("备选课程是否包含课程："+course2.name+","

+coursesToSelect.contains(course2));

//indexof来求出索引

if(coursesToSelect.contains(course2)) {

System.out.println("课程："+course2.name+"的索引位置为："+

coursesToSelect.indexOf(course2));

}

}

public void creatStudentAndSelect() {

//创建一个学生对象

student = new StudentsClass("1","小明");

System.out.println("欢迎学生："+student.name+"选课！");

//从键盘输入课程

Scanner console = new Scanner(System.in);

for(int i = 0;i<3;i++) {

System.out.println("请输入课程ID");

String courseId = console.next();

for(CourseClass cr :coursesToSelect) {

if(cr.id.equals(courseId)) {

student.courses.add(cr);

student.courses.add(null);

student.courses.add(cr);

}

}

}

}

//测试Set的contains方法

public void testSetContains() {

System.out.println("请输入学生已选的课程名：");

String name = console.next();

CourseClass course2 = new CourseClass();

course2.name = name;

System.out.println("新创建课程："+course2.name);

System.out.println("备选课程是否包含课程："+course2.name+","

+student.courses.contains(course2));

}

public static void main(String[] args) {

// TODO Auto-generated method stub

SetTest st = new SetTest();

st.testAdd();

st.testForEach();

st.testListContains();

// st.creatStudentAndSelect();

// st.testSetContains();

}

}

5、利用Map进行增加，删除，查询，修改操作

package 学生管理系统;

import java.util.HashMap;

import java.util.Map;

import java.util.Map.Entry;

import java.util.Scanner;

import java.util.Set;

public class MapTest {

public Mapstudents;

//利用哈希键值对进行创建

public MapTest() {

this.students = new HashMap();

}

//进行学生的插入操作

public void testPut() {

Scanner console = new Scanner (System.in);

int i = 0;

while(i<3) {

System.out.println("请输入学生ID：");

String ID = console.next();

StudentsClass st = students.get(ID);

if(st == null) {

System.out.println("请输入学生姓名：");

String name = console.next();

StudentsClass newStudent = new StudentsClass(ID,name);

students.put(ID,newStudent);

System.out.println("成功添加学生："+students.get(ID).name);

i++;

}else {

System.out.println("该学生ID已经被占用！");

continue;

}

}

}

//利用keyset方法将key值放在一个集合中，然后利用key值进行遍历

public void testKeySet() {

SetkeySet = students.keySet();

//进行遍历

for(String stuID:keySet) {

StudentsClass st = students.get(stuID);

if(st != null) {

System.out.println("学生："+st.name);

}

}

}

//进行删除操作

public void testRmove() {

Scanner console = new Scanner(System.in);

while(true) {

System.out.println("请输入要删除的学生ID！");

String ID = console.next();

StudentsClass st = students.get(ID);

if(st == null) {

System.out.println("该ID不存在！");

continue;

}

students.remove(ID);

System.out.println("成功删除学生："+st.name);

break;

}

}

//通过entryset来遍历Map

public void testEntrySet() {

Set>entrySet = students.entrySet();

for(Entry entry:entrySet) {

System.out.println("取得键："+entry.getKey());

System.out.println("对应的值为："+entry.getValue().name);

}

}

//进行修改操作

public void testModify() {

System.out.println("请输入要修改的学生ID：");

Scanner console = new Scanner(System.in);

while(true) {

String stuID = console.next();

StudentsClass student = students.get(stuID);

if(student == null) {

System.out.println("该ID不存在！请重新输入！");

continue;

}

System.out.println("当前学生ID，所对应的学生为："+student.name);

System.out.println("请输入新的学生姓名:");

String name = console.next();

StudentsClass newStudent = new StudentsClass(stuID,name);

students.put(stuID,newStudent);

System.out.println("修改成功");

}

}

//通过键值或值进行查询操作

public void testContainsKeyOrValue() {

System.out.println("请输入要查询的学生ID：");

Scanner console = new Scanner(System.in);

String id = console.next();

System.out.println("您输入的学生ID为："+id+"在学生映射表中是否存在："+

students.containsKey(id)

);

if(students.containsKey(id)) {

System.out.println("对应的学生为："+students.get(id).name);

}

System.out.println("请输入要查询的学生姓名：");

String name = console.next();

if(students.containsValue(new StudentsClass(null,name)))

System.out.println("在学生映射表中确实包含学生："+name);

else

System.out.println("在学生映射表中不存在该学生");

}

public static void main(String[] args) {

// TODO Auto-generated method stub

MapTest mt = new MapTest();

mt.testPut();

mt.testKeySet();

// mt.testRmove();

// mt.testEntrySet();

// mt.testModify();

// mt.testEntrySet();

mt.testContainsKeyOrValue();

}

}

6、进行重载比较

package 学生管理系统;

import java.util.Comparator;

public class StudentComparator implements Comparator {

@Override

public int compare(StudentsClass o1, StudentsClass o2) {

// TODO Auto-generated method stub

return o1.name.compareTo(o2.name);

}

}

7、进行排序操作

package 学生管理系统;

import java.util.ArrayList;

import java.util.Collections;

import java.util.List;

import java.util.Random;

public class CollectionTest {

//利用Collection内部方法进行排序操作

public void testSort1() {

//进行整形排序

ListintergerList = new ArrayList();

Random random = new Random();

Integer k;

for(int i = 0;i < 10; i++) {

do {

k = random.nextInt(100);

}while(intergerList.contains(k));

intergerList.add(k);

System.out.println("成功添加整数："+k);

System.out.println("--------排序前-------");

for(Integer integer:intergerList) {

System.out.println("元素："+integer);

}

Collections.sort(intergerList);

System.out.println("--------排序后-------");

for(Integer integer:intergerList)

System.out.println("元素："+integer);

}

}

//进行String排序

public void testSort2() {

ListstringList = new ArrayList();

stringList.add("microsoft");

stringList.add("google");

stringList.add("lenovo");

System.out.println("--------排序前-------");

for(String string : stringList) {

System.out.println("元素："+string);

}

Collections.sort(stringList);

System.out.println("--------排序后-------");

for(String string : stringList) {

System.out.println("元素："+string);

}

}

//对StudentsClass类进行排序，这里就需要进行equal和hashcode的重载

public void testSort3() {

ListStudentList = new ArrayList();

Random random = new Random();

StudentList.add(new StudentsClass(random.nextInt(1000)+"","mike"));

StudentList.add(new StudentsClass(random.nextInt(1000)+"","lucy"));

StudentList.add(new StudentsClass(random.nextInt(1000)+"","angel"));

System.out.println("--------排序前-------");

for(StudentsClass student:StudentList) {

System.out.println("学生："+student.id+student.name);

}

Collections.sort(StudentList);

System.out.println("--------排序后-------");

for(StudentsClass student:StudentList) {

System.out.println("学生："+student.id+student.name);

}

Collections.sort(StudentList,new StudentComparator());

System.out.println("----------按照姓名排序----------");

for(StudentsClass student:StudentList) {

System.out.println("学生："+student.id+student.name);

}

}

public static void main(String[] args) {

// TODO Auto-generated method stub

CollectionTest ct = new CollectionTest();

//ct.testSort1();

//ct.testSort2();

ct.testSort3();

}

}

8、辅助类。

package 学生管理系统;

public class ChildCourse extends CourseClass {

}

//进行强制类型转化

CourseClass cr = (CourseClass)coursesToSelect.get(i);

System.out.println("课程"+i+":"+cr.id+":"+cr.name);

}

}

//迭代器输入方法

public void testIterator() {

Iterator it = coursesToSelect.iterator();

System.out.println("可选择的课程（通过迭代器访问）：");

while(it.hasNext()) {

CourseClass cr = (CourseClass) it.next();

System.out.println("课程"+":"+cr.id+":"+cr.name);

}

}

//利用foreach语句进行遍历

public void testForEach() {

System.out.println("可选择的课程（通过FOREACH访问）：");

for(Object obj:coursesToSelect) {

CourseClass cr = (CourseClass) obj;

System.out.println("课程"+":"+cr.id+":"+cr.name);

}

}

//进行修改操作

public void testModify() {

coursesToSelect.set(4, new CourseClass("7","毛概"));

}

//利用对象进行删除操作

public void testRmove1() {

System.out.println("通过对象进行删除");

CourseClass cr = (CourseClass) coursesToSelect.get(4);

System.out.println("我是课程："+cr.id+":"+cr.name);

coursesToSelect.remove(cr);

System.out.println("成功删除课程！！");

testForEach();

}

//利用索引值进行删除操作

public void testRmove2() {

// CourseClass cr = (CourseClass) coursesToSelect.getPDoBsgBIXD(4);

// System.out.println("我是课程："+cr.id+":"+cr.name);

System.out.println("通过索引值进行删除");

coursesToSelect.remove(4);

System.out.println("成功删除课程！！");

testForEach();

}

//进行删除，删除多位置的方法操作

public void testRmove3() {

System.out.println("删除4位置和5位置的课程");

CourseClass [] Course={(CourseClass) coursesToSelect.get(4),(CourseClass) coursesToSelect.get(5)};

//将Course数组转化成一个集合传递进去

coursesToSelect.removeAll(Arrays.asList(Course));

System.out.println("成功删除课程！！");

testForEach();

}

public static void main(String[] args) {

ListTest it = new ListTest();

it.testAdd();

it.test();

//it.testIterator();

//it.testForEach();

//it.testModify();

//it.testForEach();

//it.testRmove2();

it.testRmove3();

}

}

4、利用set集合进行删除，添加，查询操作

package 学生管理系统;

import java.util.ArrayList;

import java.util.Arrays;

import java.util.List;

import java.util.Scanner;

public class SetTest {

//创建

public List coursesToSelect;

//向屏幕读取

private Scanner console;

public StudentsClass student;

//进行构造

public SetTest() {

coursesToSelect = new ArrayList();

console = new Scanner(System.in);

}

public void testAdd(){

//加课

CourseClass cr1 = new CourseClass("1","数据结构");

coursesToSelect.add(cr1);

CourseClass temp = (CourseClass)coursesToSelect.get(0);

//System.out.println("添加了课程:"+temp.id+":"+temp.name);

CourseClass cr2 = new CourseClass("2","c语言");

coursesToSelect.add(0, cr2);

CourseClass temp2 = (CourseClass)coursesToSelect.get(0);

//System.out.println("添加了课程:"+temp2.id+":"+temp2.name);

CourseClass[] Course={new CourseClass("3","离散数学"),new CourseClass("4","汇编语言")};

coursesToSelect.addAll(Arrays.asList(Course));

CourseClass temp3 = (CourseClass)coursesToSelect.get(2);

CourseClass temp4 = (CourseClass)coursesToSelect.get(3);

//System.out.println("添加了两门课程："+temp3.id+":"+temp3.name+";"+temp4.id+":"+temp4.name);

CourseClass[] Course1= {new CourseClass("5","高等数学"),new CourseClass("6","大学英语")};

coursesToSelect.addAll(2, Arrays.asList(Course1));

CourseClass temp5 = (CourseClass)coursesToSelect.get(2);

CourseClass temp6 = (CourseClass)coursesToSelect.get(3);

//System.out.println("添加了两门课程："+temp5.id+":"+temp5.name+";"+temp6.id+":"+temp6.name);

}

public void testForEach() {

System.out.println("可选择的课程（通过FOREACH访问）：");

for(Object obj:coursesToSelect) {

CourseClass cr = (CourseClass) obj;

System.out.println("课程"+":"+cr.id+":"+cr.name);

}

}

//查询是否包含此课程

public void testListContains() {

CourseClass course = coursesToSelect.get(0);

System.out.println("取得课程："+course.name);

System.out.println("备选课程是否包含课程："+course.name+","

+coursesToSelect.contains(course));

System.out.println("请输入课程名称：");

String name = console.next();

CourseClass course2 = new CourseClass();

course2.name = name;

System.out.println("新创建课程："+course2.name);

System.out.println("备选课程是否包含课程："+course2.name+","

+coursesToSelect.contains(course2));

//indexof来求出索引

if(coursesToSelect.contains(course2)) {

System.out.println("课程："+course2.name+"的索引位置为："+

coursesToSelect.indexOf(course2));

}

}

public void creatStudentAndSelect() {

//创建一个学生对象

student = new StudentsClass("1","小明");

System.out.println("欢迎学生："+student.name+"选课！");

//从键盘输入课程

Scanner console = new Scanner(System.in);

for(int i = 0;i<3;i++) {

System.out.println("请输入课程ID");

String courseId = console.next();

for(CourseClass cr :coursesToSelect) {

if(cr.id.equals(courseId)) {

student.courses.add(cr);

student.courses.add(null);

student.courses.add(cr);

}

}

}

}

//测试Set的contains方法

public void testSetContains() {

System.out.println("请输入学生已选的课程名：");

String name = console.next();

CourseClass course2 = new CourseClass();

course2.name = name;

System.out.println("新创建课程："+course2.name);

System.out.println("备选课程是否包含课程："+course2.name+","

+student.courses.contains(course2));

}

public static void main(String[] args) {

// TODO Auto-generated method stub

SetTest st = new SetTest();

st.testAdd();

st.testForEach();

st.testListContains();

// st.creatStudentAndSelect();

// st.testSetContains();

}

}

5、利用Map进行增加，删除，查询，修改操作

package 学生管理系统;

import java.util.HashMap;

import java.util.Map;

import java.util.Map.Entry;

import java.util.Scanner;

import java.util.Set;

public class MapTest {

public Mapstudents;

//利用哈希键值对进行创建

public MapTest() {

this.students = new HashMap();

}

//进行学生的插入操作

public void testPut() {

Scanner console = new Scanner (System.in);

int i = 0;

while(i<3) {

System.out.println("请输入学生ID：");

String ID = console.next();

StudentsClass st = students.get(ID);

if(st == null) {

System.out.println("请输入学生姓名：");

String name = console.next();

StudentsClass newStudent = new StudentsClass(ID,name);

students.put(ID,newStudent);

System.out.println("成功添加学生："+students.get(ID).name);

i++;

}else {

System.out.println("该学生ID已经被占用！");

continue;

}

}

}

//利用keyset方法将key值放在一个集合中，然后利用key值进行遍历

public void testKeySet() {

SetkeySet = students.keySet();

//进行遍历

for(String stuID:keySet) {

StudentsClass st = students.get(stuID);

if(st != null) {

System.out.println("学生："+st.name);

}

}

}

//进行删除操作

public void testRmove() {

Scanner console = new Scanner(System.in);

while(true) {

System.out.println("请输入要删除的学生ID！");

String ID = console.next();

StudentsClass st = students.get(ID);

if(st == null) {

System.out.println("该ID不存在！");

continue;

}

students.remove(ID);

System.out.println("成功删除学生："+st.name);

break;

}

}

//通过entryset来遍历Map

public void testEntrySet() {

Set>entrySet = students.entrySet();

for(Entry entry:entrySet) {

System.out.println("取得键："+entry.getKey());

System.out.println("对应的值为："+entry.getValue().name);

}

}

//进行修改操作

public void testModify() {

System.out.println("请输入要修改的学生ID：");

Scanner console = new Scanner(System.in);

while(true) {

String stuID = console.next();

StudentsClass student = students.get(stuID);

if(student == null) {

System.out.println("该ID不存在！请重新输入！");

continue;

}

System.out.println("当前学生ID，所对应的学生为："+student.name);

System.out.println("请输入新的学生姓名:");

String name = console.next();

StudentsClass newStudent = new StudentsClass(stuID,name);

students.put(stuID,newStudent);

System.out.println("修改成功");

}

}

//通过键值或值进行查询操作

public void testContainsKeyOrValue() {

System.out.println("请输入要查询的学生ID：");

Scanner console = new Scanner(System.in);

String id = console.next();

System.out.println("您输入的学生ID为："+id+"在学生映射表中是否存在："+

students.containsKey(id)

);

if(students.containsKey(id)) {

System.out.println("对应的学生为："+students.get(id).name);

}

System.out.println("请输入要查询的学生姓名：");

String name = console.next();

if(students.containsValue(new StudentsClass(null,name)))

System.out.println("在学生映射表中确实包含学生："+name);

else

System.out.println("在学生映射表中不存在该学生");

}

public static void main(String[] args) {

// TODO Auto-generated method stub

MapTest mt = new MapTest();

mt.testPut();

mt.testKeySet();

// mt.testRmove();

// mt.testEntrySet();

// mt.testModify();

// mt.testEntrySet();

mt.testContainsKeyOrValue();

}

}

6、进行重载比较

package 学生管理系统;

import java.util.Comparator;

public class StudentComparator implements Comparator {

@Override

public int compare(StudentsClass o1, StudentsClass o2) {

// TODO Auto-generated method stub

return o1.name.compareTo(o2.name);

}

}

7、进行排序操作

package 学生管理系统;

import java.util.ArrayList;

import java.util.Collections;

import java.util.List;

import java.util.Random;

public class CollectionTest {

//利用Collection内部方法进行排序操作

public void testSort1() {

//进行整形排序

ListintergerList = new ArrayList();

Random random = new Random();

Integer k;

for(int i = 0;i < 10; i++) {

do {

k = random.nextInt(100);

}while(intergerList.contains(k));

intergerList.add(k);

System.out.println("成功添加整数："+k);

System.out.println("--------排序前-------");

for(Integer integer:intergerList) {

System.out.println("元素："+integer);

}

Collections.sort(intergerList);

System.out.println("--------排序后-------");

for(Integer integer:intergerList)

System.out.println("元素："+integer);

}

}

//进行String排序

public void testSort2() {

ListstringList = new ArrayList();

stringList.add("microsoft");

stringList.add("google");

stringList.add("lenovo");

System.out.println("--------排序前-------");

for(String string : stringList) {

System.out.println("元素："+string);

}

Collections.sort(stringList);

System.out.println("--------排序后-------");

for(String string : stringList) {

System.out.println("元素："+string);

}

}

//对StudentsClass类进行排序，这里就需要进行equal和hashcode的重载

public void testSort3() {

ListStudentList = new ArrayList();

Random random = new Random();

StudentList.add(new StudentsClass(random.nextInt(1000)+"","mike"));

StudentList.add(new StudentsClass(random.nextInt(1000)+"","lucy"));

StudentList.add(new StudentsClass(random.nextInt(1000)+"","angel"));

System.out.println("--------排序前-------");

for(StudentsClass student:StudentList) {

System.out.println("学生："+student.id+student.name);

}

Collections.sort(StudentList);

System.out.println("--------排序后-------");

for(StudentsClass student:StudentList) {

System.out.println("学生："+student.id+student.name);

}

Collections.sort(StudentList,new StudentComparator());

System.out.println("----------按照姓名排序----------");

for(StudentsClass student:StudentList) {

System.out.println("学生："+student.id+student.name);

}

}

public static void main(String[] args) {

// TODO Auto-generated method stub

CollectionTest ct = new CollectionTest();

//ct.testSort1();

//ct.testSort2();

ct.testSort3();

}

}

8、辅助类。

package 学生管理系统;

public class ChildCourse extends CourseClass {

}

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