班级,教师,学生类
学习java类之间继承,以及关联关系时的代码,可以在控制台上输入,实现相应的操作
主函数CMain
1 package com.guigu.bingzi.main; 2 3 import java.util.Scanner; 4 5 6 public class CMain 7 { 8 public static void main(String[] args) 9 { 10 Scanner sc = new Scanner(System.in); 11 System.out.println("学籍信息管理"); 12 while(true) 13 { 14 System.out.println("*********************"); 15 System.out.println("0.退出管理"); 16 System.out.println("1.输入班级信息"); 17 System.out.println("2.输入学生信息"); 18 System.out.println("3.输入教师信息"); 19 System.out.println("*********************"); 20 21 System.out.println("请输入你要操作的编号"); 22 int n = sc.nextInt(); 23 if(n==0) 24 { 25 System.out.print("结束输入信息"); 26 break; 27 } 28 else if(n==1) 29 { 30 TClass tClass = new TClass(); 31 while(true) 32 { 33 System.out.println("是否需要要输入班级的信息(Y/N)"); 34 String temp = null; 35 temp = sc.next(); 36 if(temp.equalsIgnoreCase("N")) 37 //equals区分大小写 equalsIgnoreCase不区分大小写 38 { 39 System.out.println("结束输入班级信息"); 40 break; 41 } 42 System.out.println("请输入班级编号:"); 43 tClass.setNo(sc.next()); 44 45 System.out.println("请输入班级名称:"); 46 tClass.setName(sc.next()); 47 48 System.out.println("班级编号:" + tClass.getNo()); 49 System.out.println("请输入班级名称:" + tClass.getName()); 50 } 51 /*如果有多个班级怎么办*/ 52 } 53 else if(n==2) 54 { 55 Student stu = null; 56 TClass tClass=new TClass(); 57 while(true) 58 { 59 System.out.println("是否需要要输入学生的信息(Y/N)"); 60 String temp = null; 61 temp = sc.next(); 62 if(temp.equalsIgnoreCase("N")) 63 { 64 System.out.println("结束输入学生信息"); 65 break; 66 } 67 stu = new Student(); 68 System.out.println("请输入学生的姓名:"); 69 stu.setName(sc.next()); 70 71 System.out.println("请输入学生的性别:"); 72 stu.setSex(sc.next()); 73 74 System.out.println("请输入学生的年龄:"); 75 stu.setAge(sc.nextInt()); 76 77 System.out.println("请输入学生的身高(cm):"); 78 stu.setHeight(sc.nextInt()); 79 80 System.out.println("请输入学生的体重(kg):"); 81 stu.setWeight(sc.nextInt()); 82 83 System.out.println("请输入学生的成绩:"); 84 stu.setScore(sc.nextInt()); 85 86 System.out.println("请输入学生的班级编号:"); 87 tClass.setNo(sc.next()); 88 89 System.out.println("请输入学生的班级名称:"); 90 tClass.setName(sc.next()); 91 92 tClass.addStudent(stu); 93 System.out.println("************:" +stu.toString()); 94 95 System.out.println("学生的姓名:" +stu.getName()); 96 System.out.println("学生的性别:" + stu.getSex()); 97 System.out.println("学生的年龄:" + stu.getAge()); 98 System.out.println("学生的身高(cm):" + stu.getHeight()); 99 System.out.println("学生的体重(kg):" + stu.getWeight()); 100 System.out.println("学生的成绩:" + stu.getScore()); 101 System.out.println("学生的班级编号:" + tClass.getNo()); 102 System.out.println("学生的班级名称:" + tClass.getName()); 103 } 104 } 105 else if(n==3) 106 { 107 Teacher tea = null; 108 TClass tClass=new TClass(); 109 while(true) 110 { 111 System.out.println("是否需要要输入教师的信息(Y/N)"); 112 String temp = null; 113 temp = sc.next(); 114 if(temp.equalsIgnoreCase("N")) 115 { 116 System.out.println("结束输入教师信息"); 117 break; 118 } 119 tea = new Teacher(); 120 121 System.out.println("请输入教师的姓名:"); 122 tea.setName(sc.next()); 123 124 System.out.println("请输入教师的性别:"); 125 tea.setSex(sc.next()); 126 127 System.out.println("请输入教师的年龄:"); 128 tea.setAge(sc.nextInt()); 129 130 System.out.println("请输入教师的身高(cm):"); 131 tea.setHeight(sc.nextInt()); 132 133 System.out.println("请输入教师的体重(kg):"); 134 tea.setWeight(sc.nextInt()); 135 136 System.out.println("请输入教师的类型:"); 137 tea.setType(sc.nextInt()); 138 139 while(true) 140 { 141 System.out.println("是否需要要输入教师所负责班级的信息(Y/N)"); 142 String flag = null; 143 flag = sc.next(); 144 if(flag.equalsIgnoreCase("N")) 145 { 146 System.out.println("结束输入教师所教班级信息"); 147 break; 148 } 149 System.out.println("请输入教师所教的班级编号:"); 150 tClass.setNo(sc.next()); 151 152 System.out.println("请输入教师所教的班级名字:"); 153 tClass.setName(sc.next()); 154 155 System.out.println("**********"); 156 tClass.addTeacher(tea); 157 //tea.addTClass(tClass); 158 System.out.println("**********"); 159 //有错误 160 } 161 System.out.println("教师的姓名:" +tea.getName()); 162 System.out.println("教师的性别:" + tea.getSex()); 163 System.out.println("教师的年龄:" + tea.getAge()); 164 System.out.println("教师的身高(cm):" + tea.getHeight()); 165 System.out.println("教师的体重(kg):" + tea.getWeight()); 166 System.out.println("教师的类型:" + tea.getType()); 167 System.out.println("教师所负责班级:"); 168 for(int i=0; i<tea.getClassList().size(); i++) 169 { 170 System.out.println(tea.getClassList().get(i).toString()); 171 } 172 } 173 } 174 else 175 { 176 177 } 178 } 179 } 180 }
人类People
1 package com.guigu.bingzi.main; 2 3 public class People 4 { 5 /** 6 * 姓名 7 */ 8 private String name = null; 9 10 /** 11 * 性别 12 */ 13 private String sex = null; 14 15 /** 16 * 年龄 17 */ 18 private int age = 0; 19 20 /** 21 * 身高 22 * 单位:cm 23 */ 24 private int height = 0; 25 26 /** 27 * 体重 28 * 单位:kg 29 */ 30 private int weight = 0; 31 32 /** 33 * 默认构造函数 34 */ 35 public People() 36 { 37 this("","",0,0,0); 38 } 39 40 /** 41 * 构造函数 42 * @param name 姓名 43 * @param sex 性别 44 * @param age 年龄 45 * @param height 身高 cm 46 * @param weight 体重 kg 47 */ 48 public People(String name,String sex,int age,int height,int weight) 49 { 50 this.name = name; 51 this.sex = sex; 52 this.age = age; 53 this.height = height; 54 this.weight = weight; 55 } 56 57 @Override 58 public String toString() { 59 return "People [name=" + name + ", sex=" + sex + ", age=" + age 60 + ", height=" + height + ", weight=" + weight + "]"; 61 } 62 63 /** 64 * 判断身高体重是否正常 65 * @return 0:正常 1:偏胖 -1:偏瘦 2:异常 66 */ 67 public int isOK() 68 { 69 if(this.sex.equals("男")) 70 { 71 if(this.height - 105 == this.weight) 72 { 73 return 0; //正常 74 } 75 else if(this.height - 105 < this.weight) 76 { 77 return 1; //偏胖 78 } 79 else 80 { 81 return -1; //偏瘦 82 } 83 } 84 else if(this.sex.equals("女")) 85 { 86 if(this.height - 115 == this.weight) 87 { 88 return 0; //正常 89 } 90 else if(this.height - 105 < this.weight) 91 { 92 return 1; //偏胖 93 } 94 else 95 { 96 return -1; //偏瘦 97 } 98 } 99 else 100 { 101 return 2; //性别不详 102 } 103 } 104 public String getName() { 105 return name; 106 } 107 108 public void setName(String name) { 109 this.name = name; 110 } 111 112 public String getSex() { 113 return sex; 114 } 115 116 public void setSex(String sex) { 117 this.sex = sex; 118 } 119 120 public int getAge() { 121 return age; 122 } 123 124 public void setAge(int age) { 125 this.age = age; 126 } 127 128 public int getHeight() { 129 return height; 130 } 131 132 public void setHeight(int height) { 133 this.height = height; 134 } 135 136 public int getWeight() { 137 return weight; 138 } 139 140 public void setWeight(int weight) { 141 this.weight = weight; 142 } 143 144 }
学生类Student
1 package com.guigu.bingzi.main; 2 3 public class Student extends People 4 { 5 /** 6 * 学生成绩 7 * 百分制 8 */ 9 private int score; 10 11 /** 12 * 学生班级 13 */ 14 public TClass tClass; 15 16 /** 17 * 默认构造函数 18 */ 19 public Student() 20 { 21 this(null,null,0,0,0,0,null); //同一个函数总不能同时出现super和this,所以不能调用super 22 } 23 24 /** 25 * 构造函数 26 * @param name 姓名 27 * @param sex 性别 28 * @param age 年龄 29 * @param height 身高 30 * @param weight 体重 31 * @param score 成绩 32 * @param tClass 班级 33 */ 34 public Student(String name,String sex,int age,int height,int weight,int score,TClass tClass) 35 { 36 super(name,sex,age,height,weight); 37 this.score = score; 38 this.tClass = tClass; 39 } 40 41 public int getScore() { 42 return score; 43 } 44 45 public void setScore(int score) { 46 this.score = score; 47 } 48 49 public TClass gettClass() { 50 return tClass; 51 } 52 53 public void settClass(TClass tClass) { 54 this.tClass = tClass; 55 } 56 57 public String getName() { 58 return super.getName(); 59 } 60 61 public String getSex() { 62 return super.getSex(); 63 } 64 65 public int getAge() { 66 return super.getAge(); 67 } 68 69 public int getHeight() { 70 return super.getHeight(); 71 } 72 73 public int getWeight() { 74 return super.getWeight(); 75 } 76 77 @Override 78 public String toString() { 79 return super.toString() + "Student [score=" + score + ", tClass=" + tClass + "]"; 80 } 81 82 83 }
班级类TClass
1 package com.guigu.bingzi.main; 2 3 import java.util.ArrayList; 4 5 public class TClass //因为系统中存在class关键字,前边加T,用来区分 6 { 7 /** 8 * 班级编号 9 */ 10 private String no = null; 11 12 /** 13 * 班级名称 14 */ 15 private String name = null; 16 17 /** 18 * 班级中存储的学生信息 19 */ 20 private ArrayList<Student> stuList = null; 21 22 /** 23 * 班级中存储的教师信息 24 */ 25 private ArrayList<Teacher> teaList = null; 26 //在开辟TClass内存时开辟了这个集合内存(在构造函数里边),不能定义在主函数里边 27 28 /** 29 * 默认构造函数 30 */ 31 public TClass() 32 { 33 this("","",new ArrayList<Student>(),new ArrayList<Teacher>()); 34 //这边老师的方法有问题,应该是new ArrayList<Student>(),new ArrayList<Teacher>(),如果定义成null,会出现空指针异常 35 } 36 37 /** 38 * 构造函数 39 * @param no 编号 40 * @param name 名称 41 * @param stuList 班级中存储的学生信息 42 * @param teaList 班级中存储的教师信息 43 */ 44 public TClass(String no,String name,ArrayList<Student> stuList,ArrayList<Teacher> teaList) 45 { 46 this.no = no; 47 this.name = name; 48 this.stuList = stuList; 49 this.teaList = teaList; 50 } 51 52 /** 53 * 向班级中添加学生对象(双向关联) 54 * @param stu 学生对象 55 */ 56 public void addStudent(Student stu) 57 { 58 this.stuList.add(stu); 59 stu.settClass(this); 60 } 61 62 /** 63 * 向班级中添加学生对象(双向关联) 64 * @param stu 学生对象 65 */ 66 public void addTeacher(Teacher tea) 67 { 68 this.teaList.add(tea); 69 tea.addTClass(this); 70 } 71 72 public String getNo() { 73 return no; 74 } 75 76 public void setNo(String no) { 77 this.no = no; 78 } 79 80 public String getName() { 81 return name; 82 } 83 84 public void setName(String name) { 85 this.name = name; 86 } 87 88 public ArrayList<Student> getStuList() { 89 return stuList; 90 } 91 92 public void setStuList(ArrayList<Student> stuList) { 93 this.stuList = stuList; 94 } 95 96 public ArrayList<Teacher> getTeaList() { 97 return teaList; 98 } 99 100 public void setTeaList(ArrayList<Teacher> teaList) { 101 this.teaList = teaList; 102 } 103 104 }
教师类Teacher
1 package com.guigu.bingzi.main; 2 3 import java.util.ArrayList; 4 5 public class Teacher extends People 6 { 7 /** 8 * 教师负责班级 9 */ 10 private ArrayList<TClass> classList = null; 11 12 /** 13 * 教师类型 14 * 0:班主任 1:授课教师 15 */ 16 private int type; 17 18 public Teacher() 19 { 20 classList = new ArrayList <TClass>(); 21 22 //this(null,null,0,0,0,0,t); //同一个函数总不能同时出现super和this,所以不能调用super 23 } 24 25 /** 26 * 构造函数 27 * @param name 姓名 28 * @param sex 性别 29 * @param age 年龄 30 * @param height 身高 31 * @param weight 体重 32 * @param type 教师类型 0:班主任 1:授课教师 33 * @param tClass 班级 34 */ 35 public Teacher(String name,String sex,int age,int height,int weight,int type,ArrayList<TClass> classList) 36 { 37 super(name,sex,age,height,weight); 38 this.type = type; 39 this.classList = classList; 40 } 41 42 /** 43 * 添加授课班级 44 * @param tClass 班级对象 45 */ 46 public void addTClass(TClass tClass) 47 { 48 if(tClass==null) 49 System.out.println("tClass is null"); 50 this.classList.add(tClass); 51 } 52 53 public ArrayList<TClass> getClassList() { 54 return classList; 55 } 56 57 public void setClassList(ArrayList<TClass> classList) { 58 this.classList = classList; 59 } 60 61 public int getType() { 62 return type; 63 } 64 65 public void setType(int type) { 66 this.type = type; 67 } 68 69 public String getName() { 70 return super.getName(); 71 } 72 73 public String getSex() { 74 return super.getSex(); 75 } 76 77 public int getAge() { 78 return super.getAge(); 79 } 80 81 public int getHeight() { 82 return super.getHeight(); 83 } 84 85 public int getWeight() { 86 return super.getWeight(); 87 } 88 }
把每一件简单的事情做好,就是不简单;把每一件平凡的事情做好,就是不平凡!相信自己,创造奇迹~~