基于JAVA实现的成绩管理系统面向对象编程【控制台版本】

package com.temp; import java.util.Arrays; import java.util.Scanner; /** * @Description : * @Date: 2022-12-07 17:58 */ public class StudentInfo { public void menu(Student[] stu) //将异常抛出，调用这个方法去处理异常,如果main方法也将异常抛出，则交给Java虚拟机来处理,下同. { Scanner in=new Scanner(System.in); System.out.println("**欢迎进入学生成绩管理系统*************"); System.out.println("请选择您的操作："); System.out.println("***** 1.录人学生成绩信息 ******"); System.out.println("***** 2.显示学生成绩信息 ******"); System.out.println("***** 3.计算平均成绩 ******"); System.out.println("***** 4.显示最高成绩 ******"); System.out.println("***** 5.按姓名查找学生信息 ******"); System.out.println("***** 6.修改学生信息 ******"); System.out.println("***** 7.按成绩排序学生信息 ******"); System.out.println("***** 8.按学号排序学生信息 ******"); System.out.println("***** 9.按姓名排序学生信息 ******"); System.out.println("***** 10.学生对象数组扩容 ******"); System.out.println("***** 11.学生成绩分段输出 ******"); System.out.println("***** 0.退出 ******"); System.out.println("******************************************"); System.out.print("请输入数字选项(0 ~ 11):"); int a = in.nextInt(); while(a<0||a>11) { System.out.print("输入无效，请重新输入:"); a=in.nextInt(); } switch(a) { case 1:inputstu(stu);break; case 2:this.show(stu);break; case 3:this.Pingfen(stu);break; case 4:this.Topchengji(stu);break; case 5:this.search(stu);break; case 6: this.change(stu);break; case 7: this.sortcj(stu);break; case 8: this.sortxh(stu);break; case 9: this.sortname(stu);break; case 10: this.kuorong(stu);break; case 11: this.printMsg(stu);break; case 0:System.out.println("成功退出系统！！！");System.exit(0);break; } } private void inputstu(Student[] stu) { while (true){ Scanner sc = new Scanner(System.in); System.out.println("请输入学号"); int id = sc.nextInt(); System.out.println("请输入姓名"); String name = sc.next(); System.out.println("请输入成绩"); int chengji = sc.nextInt(); Student s = new Student(id,name,chengji); stu[Student.sumstu-1] = s; System.out.println("是否继续录入 Y/N ?"); String continueFlag = sc.next(); if("N".equalsIgnoreCase(continueFlag)){ menu(stu); break; } } } // 所有学生成绩信息 private void show(Student[] stu) { System.out.println("所有学生成绩信息如下："); for (Student student : stu) { if(student != null){ student.print(); } } menu(stu); } //求所有学生的成绩平均分 double Pingfen(Student[] stu){ System.out.println("学生平均成绩信息如下："); int cj = 0; for (Student student : stu) { if(student != null){ cj += student.chengji; } } System.out.println("平均成绩：" + (cj/Student.sumstu)); menu(stu); return 0; } public Student[] Topchengji(Student[] stu){ //查找成绩最高的学生 System.out.println("最高学生成绩信息如下："); int cj = 0; for (Student student : stu) { if(student != null){ if(student.getChengji() > cj){ cj = student.getChengji(); } } } for (Student student : stu) { if(student != null){ if(student.getChengji() == cj){ student.print(); } } } menu(stu); return null; } public Student search (Student[] stu){ //查找学生 System.out.println("输入需要查询的学生姓名："); int searchid = -1; Scanner sc = new Scanner(System.in); String tmpname = sc.next(); //按输入的姓名去查找 for (Student student : stu) { if(student != null){ if(tmpname.equalsIgnoreCase(student.getName())){ searchid = 0; student.print(); } } } if (searchid == -1){ System.out.println("没有符合条件的学生"); return null; } menu(stu); return null; } public Student change(Student[] stu){ //修改给定名字的学生成绩 System.out.println("输入需要修改的学生姓名："); Scanner sc = new Scanner(System.in); String tmpname = sc.next(); for (Student student : stu) { if(student != null){ if(tmpname.equalsIgnoreCase(student.getName())){ student.print(); } } } System.out.println("请输入修改成绩："); sc = new Scanner(System.in); int score = sc.nextInt(); for (Student student : stu) { if(student != null){ if(tmpname.equalsIgnoreCase(student.getName())){ student.setChengji(score); student.print(); } } } menu(stu); return null; } public Student[] sortcj(Student[] stu){ //按成绩排序，放到新的数组中 System.out.println("排序后学生信息如下："); Student[] students = Arrays.copyOf(stu, Student.sumstu); Arrays.sort(students,(o1,o2)->{ if(o1.getChengji()>o2.getChengji())return 1; else return -1; }); for (Student student : students) { student.print(); } menu(stu); return null; } public Student[] sortxh(Student[] stu){ System.out.println("排序后学生信息如下："); Student[] students = Arrays.copyOf(stu, Student.sumstu); Arrays.sort(students,(o1,o2)->{ if(o1.getId()>o2.getId())return 1; else return -1; }); for (Student student : students) { student.print(); } menu(stu); return null; } public Student[] sortname(Student[] stu){ System.out.println("排序后学生信息如下："); Student[] students = Arrays.copyOf(stu, Student.sumstu); Arrays.sort(students); for (Student student : students) { student.print(); } menu(stu); return null; } public Student[] kuorong(Student[] stu){ System.out.println("学生信息扩容进行中......"); Student[] students = Arrays.copyOf(stu, stu.length+20); System.out.println("学生信息扩容完成......"); menu(students); return null; } public Student[] printMsg(Student[] stu){ int a = 0,b = 0,c = 0,d = 0,e = 0; Student[] students = Arrays.copyOf(stu,