java设计简单学生管理系统

package swpu.student;

public class Student {
 public String number;
 public String name;
 public String major;

 public int math;
 public int computer;
 public int english;
 public int total;
 //对象数组初始化,使用构造方法
 public Student(String newname,String nmajor,String newnumber,int nmath,int ncom,int ne){
 number = newnumber;
 major =nmajor;
 name = newname;
 math = nmath;
 computer = ncom;
 english = ne; 
 } 
 public String getMajor() {
 return major;
 }
 public void setMajor(String major) {
 this.major = major;
 }
 public int getEnglish() {
 return english;
 }
 public void setEnglish(int english) {
 this.english = english;
 }
 public String getNumber() {
 return number;
 }
 public void setNumber(String number) {
 this.number = number;
 }
 public String getName() {
 return name;
 }
 public void setName(String name) {
 this.name = name;
 }
 public int getMath() {
 return math;
 }
 public void setMath(int math) {
 this.math = math;
 }
 public int getComputer() {
 return computer;
 }
 public void setComputer(int computer) {
 this.computer = computer;
 }


}

package swpu.student;

public class Rank {
 public static void rankscore(Student [] arr,int n){
 //数学
 if(n==1) {
 for (int i = 0; i < arr.length-1; i++) {
  int index = i;
  int j;
  // 找出最小值得元素下标
  for (j = i + 1; j < arr.length; j++) {
   if (arr[j].math > arr[index].math) {
   index = j;
   }
  }
  int tmp = arr[index].math;
  arr[index].math = arr[i].math;
  arr[i].math = tmp;
  }
 }
 //英语
 if(n==2) {
 for (int i = 0; i < arr.length-1; i++) {
  int index = i;
  int j;
  // 找出最小值得元素下标
  for (j = i + 1; j < arr.length; j++) {
   if (arr[j].english > arr[index].english) {
   index = j;
   }
  }
  int tmp = arr[index].english;
  arr[index].english = arr[i].english;
  arr[i].english = tmp;
  }
 }
 //计算机
 if(n==3) {
 for (int i = 0; i < arr.length-1; i++) {
  int index = i;
  int j;
  // 找出最小值得元素下标
  for (j = i + 1; j < arr.length; j++) {
   if (arr[j].computer > arr[index].computer) {
   index = j;
   }
  }
  int tmp = arr[index].computer;
  arr[index].computer = arr[i].computer;
  arr[i].computer = tmp;
  }
 }
 }
}

package swpu.student;

public class Search {
 //书写两种方法（学号，姓名）

 public int StuNum(Student arr[] ,String y)//传入数组，查找值 ,使用字符串的比较
 {
 for(int i = 0;i<arr.length;i++)
 {
 if(arr[i].number.equals(y))
 return i;
 }
 return -1;
 }
 public int StuNam(Student stu[] ,String x) {
 for(int i = 0;i<stu.length;i++)
 {
 if(stu[i].name.equals(x))
 return i;
 }
 return -1;
 }
}

package swpu.student;
import java.util.Scanner;
public class Instudent {

 public static void main(String[] args) {
 // TODO Auto-generated method stub
 Scanner in = new Scanner(System.in);
 Student []stu = new Student[5];
 //学生成绩初始化 
 stu[0] = new Student("Jack","软工 ","20183101",80,90,85);
 stu[1] = new Student("Rose","大数据","20183102",99,93,90);
 stu[2] = new Student("John","网安全","20183103",87,70,74);
 stu[3] = new Student("Andi","网工程","20183104",67,66,68);
 stu[4] = new Student("Mike","物联网","20183105",56,90,55);
 //局部变量的初始化
 String nu1 = "";
 String na1 = "";
 String ma1 = "";
 int t1=0,t2=0,t3=0;
 System.out.println("-------------------学生成绩管理系统------------------------");
 //输入学生信息
 for(int i=0;i<stu.length;i++) {
 System.out.println("请输入第"+(i+1)+"个学生的姓名，专业，学号，数学成绩，计算机成绩，英语成绩"); 
 na1 = in.next();//姓名
 ma1 = in.next();//专业
 nu1 = in.next();//学号
 t1 = in.nextInt();
 t2 = in.nextInt();
 t3 = in.nextInt();
 stu[i].setNumber(nu1);
 stu[i].setName(na1);
 stu[i].setMajor(ma1);
 stu[i].setEnglish(t3);
 stu[i].setComputer(t2);
 stu[i].setMath(t2);
 }
 Search search = new Search();
 //选择需要的查找的方法
 System.out.println("选择需要的查找的方法, 1学号，2姓名");
 int p = in.nextInt();
 if(p==1) {
 //使用学号的方法进行查找
 System.out.println("输入您所需要查找的学生学号");
 String y = in.next();
 int x = search.StuNum(stu,y);
 if(x>=0)
 System.out.println("学号:"+stu[x].number+" 学生:"+stu[x].name+" 专业:"+stu[x].major+" 数学:"+stu[x].math+" 计算机:"+stu[x].computer+" 英语:"+stu[x].english);
 else
 System.out.println("输入的学生不存在");
 }
 if(p==2) {
 //使用姓名的方法进行查找
 System.out.println("输入您所需要查找的学生姓名");
 String thename = in.next();
 int w = search.StuNam(stu,thename);
 if(w>=0)
 System.out.println("学号:"+stu[w].number+" 学生:"+stu[w].name+" 专业:"+stu[w].major+" 数学:"+stu[w].math+" 计算机:"+stu[w].computer+" 英语:"+stu[w].english);
 else
 System.out.println("输入的学生不存在");
 }
 System.out.println("是否需要对单科成绩进行排名 [Y/N] 1 =yes,2=no");
 int op = in.nextInt();
 if(op==1) {
 //单科成绩的排序（输入所需要科目然后直接进行排序）
 Rank rank = new Rank();//创建对象
 System.out.println("输入所需要排序的成绩编号 , 1：数学，2：英语，3：计算机");
 int major = in.nextInt();
 rank.rankscore(stu,major);
 //输出排序后的成绩
 for(int i = 0;i < stu.length;i++) {
 System.out.println("学号:"+stu[i].number+" 学生:"+stu[i].name+" 专业:"+stu[i].major+" 数学:"+stu[i].math+" 计算机:"+stu[i].computer+" 英语:"+stu[i].english);
 }
 }
 else {
 System.out.println("结束，退出系统");
 }
 }
 

}

stu[0] = new Student(" "," "," ",0,0,0);
stu[1] = new Student(" "," "," ",0,0,0);
stu[2] = new Student(" "," "," ",0,0,0);
stu[3] = new Student(" "," "," ",0,0,0);
stu[4] = new Student(" "," "," ",0,0,0);