一：

  1. package Date0805.Test03;
  3. /**
  4.  * 作者：sakura
  5.  * 日期：2022年08月05日 14:24
  6.  */
  7. public class test1 {
  8.     public static void main(String[] args) {
  11.         Person[] person = new Person[3];
  12.         person[0] = new Person("kunkun", 90, "唱跳rap");
  13.         person[1] = new Person("sakura",20,"架构师");
  14.         person[2] = new Person("LF",18,"保安");
  16.         for (int i = 0; i < person.length-1; i++) {
  17.             for (int j = 0; j < person.length-1-i; j++) {
  18.                 if (person[j].getAge()>person[j+1].getAge()){
  19.                     /*int temp = 0;
  20.                     temp = person[j].getAge();
  21.                     person[j].setAge(person[j+1].getAge());
  22.                     person[j+1].setAge(temp);*/
  24.                     Person temp = new Person();
  25.                     temp = person[j];
  26.                     person[j] =person[j+1];
  27.                     person[j+1] = temp;
  29.                 }
  30.             }
  31.         }
  32.         for (int i = 0; i < person.length; i++) {
  33.             System.out.println(person[i].toString());
  34.         }
  37.     }
  38. }
  40. class Person{
  41.     private String name;
  42.     private int age;
  43.     private String job;
  45.     public Person() {
  46.     }
  48.     public Person(String name, int age, String job) {
  49.         this.name = name;
  50.         this.age = age;
  51.         this.job = job;
  52.     }
  54.     public String getName() {
  55.         return name;
  56.     }
  58.     public void setName(String name) {
  59.         this.name = name;
  60.     }
  62.     public int getAge() {
  63.         return age;
  64.     }
  66.     public void setAge(int age) {
  67.         this.age = age;
  68.     }
  70.     public String getJob() {
  71.         return job;
  72.     }
  74.     public void setJob(String job) {
  75.         this.job = job;
  76.     }
  78.     @Override
  79.     public String toString() {
  80.         return "Person{" +
  81.                 "name='" + name + '\'' +
  82.                 ", age=" + age +
  83.                 ", job='" + job + '\'' +
  84.                 '}';
  85.     }
  86. }

二：

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三：

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四：

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五：

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  1. /**
  2.  * 作者：sakura
  3.  * 日期：2022年08月05日 21:45
  4.  */
  5. public class Test05 {
  6.     public static void main(String[] args) {
  7.         Employee employee = new Teacher("sakura",5000,30,200);
  8.         System.out.println(employee.getYearSal());
  9.         Employee employee1 = new Scientist("sakura",18000,80000);
  10.         System.out.println(employee1.getYearSal());
  11.     }
  12. }
  15. public class Employee {
  16.     private String name;
  17.     private double salary;
  19.     public Employee(String name, double salary) {
  20.         this.name = name;
  21.         this.salary = salary;
  22.     }
  24.     public String getName() {
  26.         return name;
  27.     }
  29.     public void setName(String name) {
  30.         this.name = name;
  31.     }
  33.     public double getSalary() {
  34.         return salary;
  35.     }
  37.     public void setSalary(double salary) {
  38.         this.salary = salary;
  39.     }
  41.     public double getYearSal(){
  42.         return 12* getSalary();
  43.     }
  44. }
  46. public class Teacher extends Employee{
  47.     private double classDay;
  48.     private double classSal;
  50.     public Teacher(String name, double salary, double classDay, double classSal) {
  51.         super(name, salary);
  52.         this.classDay = classDay;
  53.         this.classSal = classSal;
  54.     }
  56.     public double getClassDay() {
  57.         return classDay;
  58.     }
  60.     public void setClassDay(double classDay) {
  61.         this.classDay = classDay;
  62.     }
  64.     public double getClassSal() {
  65.         return classSal;
  66.     }
  68.     public void setClassSal(double classSal) {
  69.         this.classSal = classSal;
  70.     }
  72.     @Override
  73.     public double getYearSal() {
  74.         System.out.println("老师"+getName()+"的年工资为：");
  75.         return super.getYearSal()+(getClassSal()*getClassDay());
  76.     }
  77. }
  79. public class Scientist extends Employee{
  81.     private double bonus;
  83.     public Scientist(String name, double salary, double bonus) {
  84.         super(name, salary);
  85.         this.bonus = bonus;
  86.     }
  88.     public double getBonus() {
  89.         return bonus;
  90.     }
  92.     public void setBonus(double bonus) {
  93.         this.bonus = bonus;
  94.     }
  96.     @Override
  97.     public double getYearSal() {
  98.         return super.getYearSal()+getBonus();
  99.     }
  100. }

六：可以调用那些属性和方法

  1. class Father extends Grand{/父类
  2.     String id="001";
  3.     private double score;
  4.     public void f1(){
  5.     //super可以访问哪些成员(属性和方法)?
  6.         super.name; 
  7.         super.g10
  8.     //this可以访问哪些成员?
  9.         this.id; 
  10.         this.score; 
  11.         this.f1();
  12.         this.name;
  13.         this.g1():
  14.     }
  15. }
  17. class Son extends Father{//子类
  18.     String name="BB";
  19.     pubic void show(){
  20.     //uper可以访问哪些成员(属性和方法)?
  21.         super.id;
  22.         super.f1();
  23.         super.name;
  24.         super.g1():
  25.     //this可以访问哪些成员?
  26.         this.name; 
  27.         this.g10;
  28.         this.show();
  29.         this.id;
  30.         this.f10;
  31. }

七：写出程序结果

  1. class Test{//父类
  2.     String name = "Rose";
  3.     Test()
  4.         System.out.println("Test");
  5.     }
  6.     Test(String name){
  7.         this.name = name;
  8.     }
  9. }
  12. class Demo extends Test{//子类
  13.     String name="Jack";Demo0 {
  14.         super();
  15.         System.out.println("Demo");
  16.     }
  17.     Demo(String s){
  18.         super(s);
  19.     }
  20.     public void testo{
  21.         System.out.println(super.name);System.out.println(this.name);
  22.     }
  23.     public static void main(Stringl] args)
  24.         new Demo0.testO;//匿名对象new Demo("john").testo;//匿名
  25. }

八：

九：

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十：

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  1. @Override
  2. public boolean equals(Object o) {
  3.     if (this == o){
  4.         return true;
  5.     }
  6.     if (o instanceof Doctor){
  7.         Doctor doctor = (Doctor)o;
  8.         if (this.getName()==doctor.getName()&&
  9.             this.getAge()==doctor.getAge()&&
  10.             this.getGender()==doctor.getGender()&&
  11.             this.getJob()==doctor.getJob()&&this.getSal()==doctor.getSal()){
  12.             return  true;
  13.         }
  15.     }else {
  16.         return false;
  17.     }
  18.     return false;
  19. }

十一：

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十二：

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十三：

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  1. public class Person {
  2.     private String Name;
  3.     private String Gender;
  4.     private int age;
  6.     public Person(String name, String gender, int age) {
  7.         Name = name;
  8.         Gender = gender;
  9.         this.age = age;
  10.     }
  11.     public void play(){
  12.         System.out.println("");
  13.     }
  15.     public String getName() {
  16.         return Name;
  17.     }
  19.     public void setName(String name) {
  20.         Name = name;
  21.     }
  23.     public String getGender() {
  24.         return Gender;
  25.     }
  27.     public void setGender(String gender) {
  28.         Gender = gender;
  29.     }
  31.     public int getAge() {
  32.         return age;
  33.     }
  35.     public void setAge(int age) {
  36.         this.age = age;
  37.     }
  39.     public void printinfo(){
  40.         System.out.println();
  41.     }
  42. }
  1. public class Student extends Person{
  3.     private int stu_id;
  5.     public Student(String name, String gender, int age, int stu_id) {
  6.         super(name, gender, age);
  7.         this.stu_id = stu_id;
  8.     }
  10.     public void study(){
  11.         System.out.println("好好学习");
  13.     }
  15.     @Override
  16.     public void play() {
  17.         System.out.println("玩篮球");
  19.     }
  21.     public int getStu_id() {
  22.         return stu_id;
  23.     }
  25.     public void setStu_id(int stu_id) {
  26.         this.stu_id = stu_id;
  27.     }
  28.     @Override
  29.     public void printinfo() {
  30.         System.out.println("老师的信息:");
  31.         System.out.println("姓名:" + getName() + "\n" + "年龄:" + getAge() + "\n"+ "学号:" + getStu_id());
  32.         study();
  33.         play();
  34.         System.out.println("-----------------------------------------------------------");
  35.     }
  36. }
  1. public class Teacher extends Person{
  2.     private int work_age;
  4.     public Teacher(String name, String gender, int age, int work_age) {
  5.         super(name, gender, age);
  6.         this.work_age = work_age;
  7.     }
  8.     public void teach(){
  9.         System.out.println("教书育人");
  10.     }
  12.     @Override
  13.     public void play() {
  14.         System.out.println("玩象棋");
  15.     }
  17.     public int getWork_age() {
  18.         return work_age;
  19.     }
  21.     public void setWork_age(int work_age) {
  22.         this.work_age = work_age;
  23.     }
  25.     @Override
  26.     public void printinfo() {
  27.         System.out.println("老师的信息:");
  28.         System.out.println("姓名:" + getName() + "\n" + "年龄:" + getAge() +"\n"+ "工龄:" + getWork_age());
  29.         teach();
  30.         play();
  31.         System.out.println("-----------------------------------");
  32.     }
  33. }
  1. public class Test13 {
  2.     public static void main(String[] args) {
  3.         Person[] person= new Person[4];
  5.         person[0] = new Student("tom","男",8,1001);
  7.         person[1] = new Student("jack","男",78,365);
  9.         person[2] = new Teacher("sa","男",34,56);
  11.         person[3] = new Teacher("sak","男",45,54);
  13.         for (int i = 0; i < person.length; i++) {
  14.             for (int j = 0; j < person.length-1 -i; j++) {
  15.                 if (person[j].getAge() < person[j+1].getAge()){
  16.                     Person temp = null;
  17.                     temp = person[j];
  18.                     person[j] = person[j+1];
  19.                     person[j+1] = temp;
  20.                 }
  21.             }
  22.         }
  24.         for (int i = 0; i < person.length; i++) {
  25.                 person[i].printinfo();
  26.         }
  27.     }
  28. }