(继承+封装)编程:定义一个人类(Person)，包括属性:姓名、性别、年龄、国籍；
包括的方法:吃饭、睡觉，工作
(1)根据人类，定义一个学生子类，增加属性:学校、学号；重写工作方法(实现内容为学习)
(2)根据人类，定义一个工人类，增加属性：单位、工龄；重写工作方法
(3)根据学生类，定义一个学生干部类（StudentLeader）,增加属性:职务；增加方法:开会
(4)定义一个测试类，分别创建上述3类具体人物的对象并将信息打印在控制台上.
public class Person {
private String name;
private String sex;
private int age;
private String nationality;
public Person() {
}
public Person(String name, String sex, int age, String nationality) {
this.name = name;
this.sex = sex;
this.age = age;
this.nationality = nationality;
}
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 String getNationality() {
return nationality;
}
public void setNationality(String nationality) {
this.nationality = nationality;
}
public void eat(){
System.out.println("吃饭");
}
public void sleep(){
System.out.println("睡觉");
}
public void jop(){
System.out.println("工作");
}
@Override
public String toString() {
return "Person{" +
"name='" + name + '\'' +
", sex='" + sex + '\'' +
", age=" + age +
", nationality='" + nationality + '\'' +
'}';
}
}
class StuentPerson extends Person{
private String school;
private int id;
public StuentPerson() {
}
public StuentPerson(String school, int id) {
this.school = school;
this.id = id;
}
public StuentPerson(String name, String sex, int age, String nationality, String school, int id) {
super(name, sex, age, nationality);
this.school = school;
this.id = id;
}
public String getSchool() {
return school;
}
public void setSchool(String school) {
this.school = school;
}
public int getId() {
return id;
}
public void setId(int id) {
this.id = id;
}
@Override
public void jop() {
System.out.println("学生学习");
}
}
class WorkerPenson extends Person{
private String workplace;
private int seniority;
public WorkerPenson() {
}
public WorkerPenson(String workplace, int seniority) {
this.workplace = workplace;//单位
this.seniority = seniority;//工龄
}
public WorkerPenson(String name, String sex, int age, String nationality, String workplace, int seniority) {
super(name, sex, age, nationality);
this.workplace = workplace;
this.seniority = seniority;
}
public String getWorkplace() {
return workplace;
}
public void setWorkplace(String workplace) {
this.workplace = workplace;
}
public int getSeniority() {
return seniority;
}
public void setSeniority(int seniority) {
this.seniority = seniority;
}
@Override
public void jop() {
System.out.println("工人工作");
}
}
class StudentLeader extends StuentPerson{
private String post;//职务
public StudentLeader() {
}
public StudentLeader(String post) {
this.post = post;
}
public StudentLeader(String school, int id, String post) {
super(school, id);
this.post = post;
}
public StudentLeader(String name, String sex, int age, String nationality, String school, int id, String post) {
super(name, sex, age, nationality, school, id);
this.post = post;
}
public String getPost() {
return post;
}
public void setPost(String post) {
this.post = post;
}
public void meeting(){
System.out.println("学生干部开会");
}
}
class PensonTest{
public static void main(String[] args) {
StuentPerson stuentPerson = new StuentPerson("张三","男",21,"中国","四川工业",101);
stuentPerson.jop();
System.out.println(stuentPerson.getName()+stuentPerson.getSex()+stuentPerson.getAge()+stuentPerson.getNationality()+stuentPerson.getSchool()+stuentPerson.getId());
WorkerPenson workerPenson = new WorkerPenson("李四","女",32,"中国","中信银行",3);
workerPenson.jop();
System.out.println(workerPenson.getName()+workerPenson.getSex()+workerPenson.getAge()+workerPenson.getNationality()+workerPenson.getWorkplace()+workerPenson.getSeniority());
StudentLeader studentLeader = new StudentLeader("学生会主席");
studentLeader.jop();
studentLeader.meeting();
System.out.println(stuentPerson.getName()+stuentPerson.getSex()+stuentPerson.getAge()+stuentPerson.getNationality()+stuentPerson.getSchool()+stuentPerson.getId()+studentLeader.getPost());
stuentPerson.eat();
stuentPerson.sleep();
workerPenson.eat();
workerPenson.sleep();
studentLeader.eat();
studentLeader.sleep();
}
}(多态)在上一个题目的基础上，定义一个Person类型的数组，存储多个不同类型的子类型对象， (1)统计并打印输出数组中所有学生干部的个数 (2)打印输出所有学生的信息
public abstract class Person {
private String name;
private String sex;
private int age;
private String nationality;
public Person() {
}
public Person(String name, String sex, int age, String nationality) {
this.name = name;
this.sex = sex;
this.age = age;
this.nationality = nationality;
}
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 String getNationality() {
return nationality;
}
public void setNationality(String nationality) {
this.nationality = nationality;
}
public void eat() {
System.out.println("吃饭");
}
public void sleep() {
System.out.println("睡觉");
}
public abstract void jop();
@Override
public String toString() {
return "姓名='" + name + '\'' +
", 性别='" + sex + '\'' +
", 年龄=" + age +
", 国籍='" + nationality;
}
}
class StudentPerson extends Person {
private String school;
private int id;
public StudentPerson() {
}
public StudentPerson(String school, int id) {
this.school = school;
this.id = id;
}
public StudentPerson(String name, String sex, int age, String nationality, String school, int id) {
super(name, sex, age, nationality);
this.school = school;
this.id = id;
}
public String getSchool() {
return school;
}
public void setSchool(String school) {
this.school = school;
}
public int getId() {
return id;
}
public void setId(int id) {
this.id = id;
}
@Override
public void jop() {
System.out.println("学生学习");
}
@Override
public String toString() {
return super.toString()+" ,学校："+school+" ,学号："+id;
}
}
class WorkerPenson extends Person {
private String workplace;
private int seniority;
public WorkerPenson() {
}
public WorkerPenson(String workplace, int seniority) {
this.workplace = workplace;//单位
this.seniority = seniority;//工龄
}
public WorkerPenson(String name, String sex, int age, String nationality, String workplace, int seniority) {
super(name, sex, age, nationality);
this.workplace = workplace;
this.seniority = seniority;
}
public String getWorkplace() {
return workplace;
}
public void setWorkplace(String workplace) {
this.workplace = workplace;
}
public int getSeniority() {
return seniority;
}
public void setSeniority(int seniority) {
this.seniority = seniority;
}
@Override
public void jop() {
System.out.println("工人工作");
}
@Override
public String toString() {
return super.toString()+" ,单位："+workplace+" ,工龄："+seniority;
}
}
class StudentLeader extends StudentPerson {
private String post;//职务
public StudentLeader() {
}
public StudentLeader(String post) {
this.post = post;
}
public StudentLeader(String school, int id, String post) {
super(school, id);
this.post = post;
}
public StudentLeader(String name, String sex, int age, String nationality, String school, int id, String post) {
super(name, sex, age, nationality, school, id);
this.post = post;
}
public String getPost() {
return post;
}
public void setPost(String post) {
this.post = post;
}
public void meeting() {
System.out.println("学生干部开会");
}
@Override
public String toString() {
return super.toString()+"职务："+post;
}
}
class PersonTest {
public static void main(String[] args) {
WorkerPenson worker = new WorkerPenson("张三","男",23,"中国","中国石油",2);
Person worker1 = new WorkerPenson("李四","男",30,"中国","中国联通",6);
StudentPerson studentPerson = new StudentPerson("马瑞","女",30,"中国","四川工业",101);
Person studentPerson1 = new StudentPerson("杰克","女",23,"中国","西南财经",201);
StudentLeader studentLeader = new StudentLeader("汤姆","男",34,"中国","四川工业",108,"文体部");
Person studentLeader1 = new StudentLeader("肉丝","男",19,"中国","西南",112,"外联部");
Person studentLeader2 = new StudentLeader("白菜","男",20,"中国","西南",333,"全媒体");
Person[] person = new Person[]{worker,worker1,studentPerson,studentPerson1,studentLeader,studentLeader1,studentLeader2};
int count=0;
for (int i=0;i<person.length;i++){
if ((person[i] instanceof StudentLeader)==true){
count++;
}
if ((person[i] instanceof StudentPerson) ==true){
System.out.println(person[i].toString());
}
}
System.out.println("学生干部的个数为："+count);
}
}
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文章来源：https://www.toymoban.com/news/detail-719764.html
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