java第四章作业.docVIP

4—7 编写一个Java程序片断定义一个表示学生的类Student，包括域“学号”、“班号”、“姓名”、“性别”、“年龄”，方法“获得学号”、“获得班号”、“获得性别”、“获得姓名”、“获得年龄”、“修改年龄”。public class Student{ //定义变量 int stu_no; int number; string name; string sex; int age; //get\set method public int setStu_no(int stu_no){this.stu_no = stu_no;} public int getStu_no(int stu_no){return stu_no;} public int setNumber(int number){this.number=numer;} public int getNumber(int number){return number;} public String setName(String name){ = name;} public String getName(String name){return name;} public String setSex(String sex){this.sex = sex;} public String getSex(String sex){return sex;} public int setAge(int age){this.age = age;} public int getAge(int age){return age;} public Student(){//构造方法 } //带参数的构造方法变量初始化 public Student(int stu_no,int number,String sex,int age){ this.stu_no = stu_no; this.number = number; this.sex = sex; this.age = age; } //modify age method public void updateAge(int stu_no,int newAge){ if(this.stu_no = stu_no){ this.age = newAge; } } } 4-8 在第4-7题的基础上编写Java Application程序创建Student类的对象。import .Student; public class Exce{ public static void main(String ages[]){ Student stu = new Student(); } } 4-9 为Student类定义构造函数初始化所有的域，增加一个方法public String toString()把Student类对象的所有域信息组合成一个字符串。编写Application程序检验新增的功能。public class Student{ public static void main(String ages[]){ Student stu = new Student(001,55,”张三”,”男”,18); String str = stu. getToString(); System.out.println(str); } public String getToString(){ String str=学生号：+stu_no+ 班级：+number+ 姓名：+name+ 性别：+sex+ 年龄：+age; return str; } }