JAVA制作简单学生信息管理系统最初版

    这是初学JAVA后第一次制作简单的一个系统，或者说是一个小单元，程序略显复杂，以后还有机会的话会重构一下。

public class Students {private String stuNum;private String name;private String sex;public String getStuNum() {return stuNum;}public void setStuNum(String stuNum) {this.stuNum = stuNum;}public String getName() {return name;}public void setName(String name) {this.name = name;}public String getSex() {return sex;}public void setSex(String sex) {this.sex = sex;}public int getAge() {return age;}public void setAge(int age) {this.age = age;}public int getGrade() {return grade;}public void setGrade(int grade) {if(grade>0&&grade<100)this.grade = grade;}private int age;private int grade;}

import java.util.Scanner;//性别用man 和woman来看public class Main {public static void main(String[] args) throws Exception{Scanner scan = new Scanner(System.in);System.out.println("欢迎来到XXX学生信息管理系统！");int count = 1;Students[] text = new Students[count];//初始化备用数组，用于当创建新对象时将之前对象的参数赋给stus[]title:for(int a =0;;a++){System.out.println("1、添加学生信息");System.out.println("2、修改学生信息");System.out.println("3、删除学生信息");System.out.println("4、查找学生信息");System.out.println("5、打印学生信息");System.out.println("6、退出");//无限循环直到break titleStudents[] stus = new Students[count];//创建存放多个学生对象的数组，内容初始化for(int s = 0;s<count-1;s++){stus[s]=text[s];//将text数组中的对象放入stus[]内}System.out.println("请选择操作");switch(scan.nextInt()){case 1:text = new Students[count];Students stu = new Students();//创建单个学生对象String stuNum=stu.getStuNum();System.out.print("请输入学号：  ");stuNum = scan.next();stu.setStuNum(stuNum);String name=stu.getName();System.out.print("请输入姓名：  ");name = scan.next();stu.setName(name);String sex=stu.getSex();System.out.print("请输入性别：  ");sex = scan.next();if(sex.equals("man")||sex.equals("woman"))stu.setSex(sex);else{System.out.println("输入数据格式不正确，请重新录入数据");continue title;}int age=stu.getAge();System.out.print("请输入年龄：  ");age = scan.nextInt();stu.setAge(age);int grade=stu.getGrade();System.out.print("请输入分数：  ");grade = scan.nextInt();stu.setGrade(grade);stus[count-1]=stu;//将第count个学生对象存入数组stus[]中for(int i=0;i<count;i++){text[i]=stus[i];//将stus[]中的所有对象放到text数组中}count+=1;System.out.println("数据保存成功\n");break ;case 2://修改学生信息System.out.println("请选择修改方式：");System.out.println("1.根据姓名修改学生信息");System.out.println("2.根据学号修改学生信息");int c = scan.nextInt();if(c==1){System.out.println("请输入学生姓名：");String na = scan.next();for(int k = 0;k<count-1;k++){if(stus[k].getName()==null)continue;else if(stus[k].getName().equals(na)){for(int h = 0;;h++){System.out.println(stus[k].getStuNum()+"\t"+stus[k].getName()+"\t"+stus[k].getSex()+"\t"+stus[k].getAge()+"\t"+stus[k].getGrade());System.out.println("请选择需要修改的数据");System.out.print("1.学号  ");System.out.print("2.性别  ");System.out.print("3.年龄  ");System.out.print("4.成绩  ");System.out.print("5.返回主菜单  ");switch (scan.nextInt()){case 1:System.out.println("更改后的学号：");String k1 = scan.next();stus[k].setStuNum(k1);System.out.println("修改成功");break;case 2:System.out.println("更改后的性别：");String k2 = scan.next();stus[k].setSex(k2);System.out.println("修改成功");break;case 3:System.out.println("更改后的年龄：");int k3 = scan.nextInt();stus[k].setAge(k3);System.out.println("修改成功");break;case 4:System.out.println("更改后的成绩：");int k4 = scan.nextInt();stus[k].setGrade(k4);System.out.println("修改成功");break;case 5:continue title;default:System.out.println("输入数据错误");break;}}}}}else if(c==2){System.out.println("请输入学生学号：");String sa = scan.next();one: for(int f = 0;f<count-1;f++){if(sa.equals(stus[f].getStuNum())){System.out.println(stus[f].getStuNum()+"\t"+stus[f].getName()+"\t"+stus[f].getSex()+"\t"+stus[f].getAge()+"\t"+stus[f].getGrade());while(true){System.out.println("请选择需要修改的数据");System.out.print("1.姓名  ");System.out.print("2.性别  ");System.out.print("3.年龄  ");System.out.print("4.成绩  ");System.out.print("5.返回主菜单  ");int sq = scan.nextInt();if(sq ==1){System.out.println("更改后的姓名：");String f1 = scan.next();System.out.println("修改成功");stus[f].setName(f1);continue one;}else if(sq == 2){System.out.println("更改后的性别：");String f2 = scan.next();System.out.println("修改成功");stus[f].setSex(f2);continue one;}else if(sq==3){System.out.println("更改后的年龄：");int f3 = scan.nextInt();System.out.println("修改成功");stus[f].setAge(f3);continue one;}else if(sq==4){System.out.println("更改后的成绩：");int f4 = scan.nextInt();stus[f].setGrade(f4);System.out.println("修改成功");continue one;}else if(sq==5){continue title;}else{System.out.println("输入数据错误");continue one;}}}}}System.out.println("查无此人");continue title;case 3://删除学生信息System.out.println("请选择删除方式：");System.out.println("1.根据姓名删除学生信息");System.out.println("2.根据学号删除学生信息");int d = scan.nextInt();if(d==1){System.out.println("请输入学生姓名：");String na = scan.next();for(int q = 0;q<count-1;q++){if(na.equals(stus[q].getName())){for(int e =q;e<count-1;e++){if(e<count-2){stus[e].setGrade(stus[e+1].getGrade());stus[e].setAge(stus[e+1].getAge());stus[e].setName(stus[e+1].getName());stus[e].setStuNum(stus[e+1].getStuNum());stus[e].setSex(stus[e+1].getSex());}}count--;System.out.println("删除成功！！");continue title;}}System.out.println("查无此人");continue title;}else if(d==2){System.out.println("请输入学生学号");String st = scan.next();for(int g = 0;g<count-1;g++){if(st.equals(stus[g].getStuNum())){for(int j=g;j<count-1;j++){if(j<count-2){stus[j].setGrade(stus[j+1].getGrade());stus[j].setAge(stus[j+1].getAge());stus[j].setName(stus[j+1].getName());stus[j].setStuNum(stus[j+1].getStuNum());stus[j].setSex(stus[j+1].getSex());}}count--;System.out.println("删除成功！！");continue title;}}System.out.println("查无此人");continue title;}else{System.out.println("没有此选项，返回主菜单");continue title;}case 4:System.out.println("请选择查找方式：");System.out.println("1.根据姓名查找学生信息");System.out.println("2.根据学号查找学生信息");int b = scan.nextInt();if(b==1){System.out.println("请输入学生姓名：");String nam = scan.next();for(int u = 0;u<count-1;u++){if(nam.equals(stus[u].getName())){System.out.println("您要查找的学生信息为：");System.out.println("学号\t姓名\t性别\t年龄\t分数");System.out.println(stus[u].getStuNum()+"\t"+stus[u].getName()+"\t"+stus[u].getSex()+"\t"+stus[u].getAge()+"\t"+stus[u].getGrade());System.out.println();continue title;}}System.out.println("没有此学生");continue title;}else if(b==2){System.out.println("请输入学生学号：");String st = scan.next();for(int u = 0;u<count-1;u++){if(st.equals(stus[u].getStuNum())){System.out.println("您要查找的学生信息为：");System.out.println("学号\t\t姓名\t\t性别\t年龄\t分数");System.out.println(stus[u].getStuNum()+"\t"+stus[u].getName()+"\t"+stus[u].getSex()+"\t"+stus[u].getAge()+"\t"+stus[u].getGrade());System.out.println();continue title;}}System.out.println("没有此学生");continue title;}else{System.out.println("没有此选项，返回主菜单");continue title;}case 5:System.out.println("学号\t\t姓名\t\t性别\t年龄\t分数");for(int i=0;i<count-1;i++){System.out.println();System.out.println(stus[i].getStuNum()+"\t"+stus[i].getName()+"\t"+stus[i].getSex()+"\t"+stus[i].getAge()+"\t"+stus[i].getGrade());}break;case 6:System.out.println("欢迎再次使用，再见！！！");break title;default:break;}}}}