Java练习学生信息管理系统，第一次写，对于类要怎么弄，函数要干嘛，main方法静态不能用非静态的等等很是烦恼了好大一阵。

幸好ArrayList做参数时，是引用传递。。。C++用&就可以引用传递，Java呢？

1 package Student; 2  3 public class Student 4 { 5     private String stunumber;  6     private String name; 7     private int age; 8     private boolean sex;//man=false,woman=true 9     private Double score;10     Student ()11     {12         stunumber="";13         name="";14         age=0;15         sex=false;16         score=0.0;17     }18     Student (String a,String b,int c,boolean d,Double e)19     {20         stunumber=a;21         name=b;22         age=c;23         sex=d;24         score=e;25     }26     public void set_stunumber(String str)27     {28         stunumber=str;29     }30     public void set_name(String str)31     {32         name=str;33     }34     public void set_age(int n)35     {36         age=n;37     }38     public void set_sex(boolean bool)39     {40         sex=bool;41     }42     public void set_score(Double n)43     {44         score=n;45     }46     public String get_stunumber()47     {48         return stunumber;49     }50     public String get_name()51     {52         return name;53     }54     public int get_age()55     {56         return age;57     }58     public boolean get_sex()59     {60         return sex;61     }62     public Double get_score()63     {64         return score;65     }66 67 }

1 package Student;  2 import java.util.Scanner;  3 import java.util.ArrayList;  4 public class StudentManager  5 {  6     public static void main(String[] args)  7     {  8         Scanner input=new Scanner(System.in);  9         ArrayList
     
       stu=new ArrayList
      
       (); 10         int select=1; 11         for(;;) 12         { 13             face(); 14             do 15             { 16             select=input.nextInt(); 17             }while(select<1||select>5); 18             switch(select) 19             { 20                 case 1:showStudent(stu);break; 21                 case 2:addStudent(stu);break; 22                 case 3:deleteStudent(stu);break; 23                 case 4:updateStudent(stu);break; 24                 case 5:selectStudent(stu);break; 25             } 26         } 27     } 28     private static void addStudent(ArrayList
       
         stu) 29     { 30         Student stu0=new Student(); 31         String a, b,f; 32         int c; 33         boolean d=false,j=true; 34         Double e; 35          36         Scanner input=new Scanner(System.in); 37         System.out.println("请依次输入：学号、姓名、年龄、性别、成绩"); 38         a=input.next(); 39         b=input.next(); 40         c=input.nextInt(); 41         f=input.next(); 42         e=input.nextDouble(); 43         if(stu.size()!=0) 44         { 45             for(int i=0;i
        
          stu) 76     { 77         boolean f=false; 78         String str; 79         System.out.println("请输入要删除的学生的学号："); 80         Scanner input=new Scanner(System.in); 81         str=input.next(); 82         for(int i=0;i
         
           stu) 97     { 98         Student stu0; 99         String a, b,f;100         int c,num=0;101         boolean d,j=true;102         Double e;103         Scanner input=new Scanner(System.in);104         System.out.println("请输入待修改学生学号：");105         a=input.next();106         if(stu.size()!=0)107         {108             for(int i=0;i
          
            stu)156 {157 boolean j=true;//默认无重复158 int num=0;159 String s;160 Scanner input=new Scanner(System.in);161 String str;162 System.out.println("请输入学号：");163 str=input.next();164 if(stu.size()!=0)165 {166 for(int i=0;i
           
             stu)209 {210 String s;211 for(int i=0;i