java实现学生信息统计系统

学生信息查询

功能：

代码块

package com.lanou.work01;

import java.util.ArrayList;
import java.util.HashSet;

public class ProgramSystem {

public static void main(String[] args) {
ArrayList<Student> listStudent = new ArrayList<Student>();

// 学生小李
Student student = new Student(1, "小李");
Subject subject1 = new Subject("语文", 90.7);
Subject subject2 = new Subject("数学", 10.5);
student.list.add(subject1);
student.list.add(subject2);

// 学生小王
Student student2 = new Student(1, "小王");
Subject subject3 = new Subject("语文", 20.7);
Subject subject4 = new Subject("数学", 10.5);
student2.list.add(subject3);
student2.list.add(subject4);

// 装进大的数组
listStudent.add(student);
listStudent.add(student2);
System.out.println(listStudent.size());

Control control = new Control(listStudent);
//以下注释内容为功能测试
// control.getScore(student, "语文");
// System.out.println("-------------------------");
// control.getId(1, "数学");
// System.out.println("-------------------------");
// control.upDateName(1, "小陈");
// System.out.println(student.nameString);
// System.out.println("-------------------------");
// control.upDateScore("小陈", "语文", 0.0);
// System.out.println(student);
// control.removeStudent(student);
// System.out.println(listStudent);
// control.countStudnet(student, "语文");
control.fun("语文");
}
}

class Control {
// 存放学生的数组
ArrayList<Student> listStudent = new ArrayList<Student>();

public Control(ArrayList<Student> listStudent) {
this.listStudent = listStudent;
}
//展示方法
public void show(){
System.out.println("*************************");
}

// 获取指定学生的成绩
public void getScore(Student student, String bookName) {
for (Student student2 : listStudent) {
if (student.nameString.equals(student2.nameStri
a486
ng)) {

for (Subject sub : student.list) {
// 每一个成绩类对象
if (bookName.equals(sub.nameBook)) {
System.out.println(sub.Score);
}
}
}

}
}
// 获取指定学号的成绩
public void getId(int id, String bookName) {
for (Student student2 : listStudent) {
if (student2.id == id) {// 如果id相等话
for (Subject sub : student2.list) {
// 每一个成绩类对象
if (bookName.equals(sub.nameBook)) {
System.out.println(sub.Score);
}
}

}

}
}

// 根据id修改姓名
public void upDateName(int id, String name) {
for (Student student : listStudent) {
if (student.id == id) {// 如果想等的话
student.nameString = name;
}
}
}

// 根据姓名修改指定学科的成绩
public void upDateScore(String name, String bookName, Double score) {
for (Student student : listStudent) {
if (student.nameString.equals(name)) {
for (Subject subject : student.list) {
if (subject.nameBook.equals(bookName)) {
subject.Score = score;
}
}
}
}
}
// 删除指定学生及其成绩
public void removeStudent(Student student) {
Student student3 = new Student();
System.out.println(listStudent);
for (Student student2 : listStudent) {
if (student2.nameString.equals(student.nameString)) {
student3 = student2;
}
}
listStudent.remove(student3);
}

// 统计所有成绩相等的人数
public void countStudnet(Student student, String namString) {
int count = 1;
// 创建一个数组
double array[] = new double[listStudent.size()];
System.out.println(listStudent.size());
for (Student student2 : listStudent) {
for (int i = 0; i < array.length; i++) {
System.out.println("数组的长度"+array.length);
for (Subject subject : student2.list) {
if (subject.nameBook.equals(namString)) {
System.out.println(namString);
array[i] = subject.Score;
System.out.println(array[i]);
}
}
}
}
// 第一个和第二个比较
for (int i = 0; i < array.length; i++) {
for (int j = i + 1; j < array.length; j++) {
if (array[i] == array[j]) {
count++;
}
}
}
System.out.println("语文成绩相等的人数为：" + count);

}

// 获取到所有学生的成绩
public void fun(String nameString) {
HashSet<Double> set = new HashSet<Double>();
for (Student student2 : listStudent) {
for (Subject subject : student2.list) {
if (nameString.equals(subject.nameBook)) {
set.add(subject.Score);
}
}
}
System.out.println(set);
}
}
//学生类
class Student {

String nameString;
int id;
ArrayList<Subject> list = new ArrayList<Subject>();

public Student(int id, String nameString) {
this.id = id;
this.nameString = nameString;

}

@Override
public String toString() {
// TODO Auto-generated method stub
for (Subject subject : list) {
return "姓名:" + nameString + "学号:" + id + "成绩单:" + subject.nameBook
+ subject.Score;
}
return null;

}

public Student() {

}
}

// 学科类
class Subject {

String nameBook;
double Score;

public Subject(String nameBook, double score) {
super();
this.nameBook = nameBook;
Score = score;
}

}