package com.imooc;
public class TempWork {
public static void main(String[] args) {
//创建学科类的对象
Subject sb = new Subject("J0001","计算机科学与应用",4);
System.out.println("专业信息如下：");
System.out.println(sb.getInFo());
System.out.println("===================");
//创建学生类的对象
Student stu1 = new Student("张三",01,'男',29,sb);
Student stu2 = new Student("李四",02,'男',28);
Student stu3 = new Student("王五",03,'女',27);
System.out.println("学生信息如下：");
System.out.println(stu1.print());
}
}
/**
* 建立一个学科类Subject，属性有专业编号，专业名称，学制年限
* @author idea
*
*/
class Subject{
private String num;
private String sbname;
private int years;
//定义无参构造
public Subject(){}
//定义三参构造
public Subject(String num,String sbname,int years){
this.setNum(num);//专业编号
this.setSbname(sbname);//专业名称
this.setYears(years);//学制年限
}
public void setNum(String num) {
this.num = num;
}
public void setSbname(String sbname) {
this.sbname = sbname;
}
public void setYears(int years) {
this.years = years;
}
public String getNum() {
return num;
}
public String getSbname() {
return sbname;
}
public int getYears() {
return years;
}
//定义一个输出学科信息的方法
public String getInFo(){
return "专业编号："+this.num+"\n"
+"专业名称："+this.sbname+"\n"
+"学制年限："+this.years+"年";
}
}
/**
* 建立一个学生类Student，属性有姓名，学号，性别，年龄，所报专业名称，学制年限
*/
class Student{
private String stuname;//学生姓名
private int id;//学号
private char sex;//性别
private int age;//年龄
private Subject studentSubject;//将学生所报专业的专业信息作为学生的一个属性
//定义无参构造
//定义一个四参构造
public Student(String stuname,int id,char sex,int age){
this.setStuname(stuname);
this.setId(id);
this.setSex(sex);
this.setAge(age);
}
//定义五参构造
public Student(String stuname,int id,char sex,int age,Subject studentSubject){
this.setStuname(stuname);
this.setId(id);
this.setSex(sex);
this.setAge(age);
this.setStudentSubject(studentSubject);
}
public void setStuname(String stuname) {
this.stuname = stuname;
}
public void setId(int id) {
this.id = id;
}
public void setSex(char sex) {
this.sex = sex;
}
public void setAge(int age) {
this.age = age;
}
public void setStudentSubject(Subject student) {
this.studentSubject = studentSubject;
}
public String getStuname() {
return stuname;
}
public int getId() {
return id;
}
public char getSex() {
return sex;
}
public int getAge() {
return age;
}
public Subject getSutdentSubject() {
//如果没有实例化则实例化，防止调用该方法时出现空指针异常
if(this.studentSubject==null){
this.studentSubject=new Subject();
}
return studentSubject;
}
//定义一个输出学生信息的方法
public String print(){
return "学生姓名："+this.getStuname()+"\n"
+"学号："+this.getId()+"\n"
+"性别："+this.getSex()+"\n"
+"年龄："+this.getAge()+"\n"
+"所学专业编号："+this.getSutdentSubject().getNum()+"\n"
+"所报专业名称："+this.getSutdentSubject().getSbname()+"\n"
+"学制年限："+this.getSutdentSubject().getYears();
}
}
1 回答
已采纳
人贩
TA贡献2条经验 获得超0个赞
setStudentSubject 里面的参数值写错了
public void setStudentSubject(Subject student) {
this.studentSubject = studentSubject;
}
改为
public void setStudentSubject(Subject studentSubject) {
this.studentSubject = studentSubject;
}
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