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chapter08-面向对象编程——（chapter08作业）——day10

news 2025/8/15 21:19:44

343-作业01

package chapter08.homeworks;public class Homework01 {public static void main(String[] args) {/*1.定义一个Person类{name, age, job},初始化Person对象数组，有3个person对象，并按照age从大到小进行排序,提示，使用冒泡排序 Homework01.java*/Person[] persons = new Person[3];persons[0]=new Person("a",10,"JAVA工程师");persons[1]=new Person("b",50,"算法工程师");persons[2]=new Person("c",35,"PHP工程师");for (int i = 0; i < persons.length; i++) {System.out.println(persons[i]);}Person tmp=null;for (int i = 0; i < persons.length-1; i++) {for (int j = 0; j < persons.length-1-i; j++) {if(persons[j].getAge()<persons[j+1].getAge()){tmp=persons[j];persons[j]=persons[j+1];persons[j+1]=tmp;}}}System.out.println("输出排序后，从大到小");for (int i = 0; i < persons.length; i++) {System.out.println(persons[i]);}}
}
class Person{private String name;private int age;private String job;public Person(String name, int age, String job) {this.name = name;this.age = age;this.job = job;}public String getName() {return name;}public void setName(String name) {this.name = name;}public int getAge() {return age;}public void setAge(int age) {this.age = age;}public String getJob() {return job;}public void setJob(String job) {this.job = job;}@Overridepublic String toString() {return "Person{" +"name='" + name + '\'' +", age=" + age +", job='" + job + '\'' +'}';}
}

344-作业02

345-作业03

package chapter08.homeworks;public class HomeWork03 {public static void main(String[] args) {Professor LDY = new Professor("林黛玉", 20, "教授", 15000, 1.1);LDY.introduce();}
}
class Teacher{private String name;private int age;private String post;private double salary;private double grade;public Teacher(String name, int age, String post, double salary, double grade) {this.name = name;this.age = age;this.post = post;this.salary = salary;this.grade = grade;}public String getName() {return name;}public void setName(String name) {this.name = name;}public int getAge() {return age;}public void setAge(int age) {this.age = age;}public String getPost() {return post;}public void setPost(String post) {this.post = post;}public double getSalary() {return salary;}public void setSalary(double salary) {this.salary = salary;}public double getGrade() {return grade;}public void setGrade(double grade) {this.grade = grade;}public void introduce() {System.out.println("name='" + name +", age=" + age +", post='" + post +", salary=" + salary +", grade=" + grade);}
}

package chapter08.homeworks;public class Professor extends Teacher{public Professor(String name, int age, String post, double salary, double grade) {super(name, age, post, salary, grade);}@Overridepublic void introduce() {System.out.println("这是教师的");super.introduce();}
}

346-作业04

package chapter08.homeworks;public class Manager extends Employee{private double bonus;public Manager(String name, double daySal, int workDays, double grade) {super(name, daySal, workDays, grade);}public double getBonus() {return bonus;}public void setBonus(double bonus) {this.bonus = bonus;}@Overridepublic void printSal() {System.out.println("经理是"+getName()+" 工资是"+(getDaySal()*getWorkDays()*getGrade()+bonus));}
}

package chapter08.homeworks;public class Manager extends Employee{private double bonus;public Manager(String name, double daySal, int workDays, double grade) {super(name, daySal, workDays, grade);}public double getBonus() {return bonus;}public void setBonus(double bonus) {this.bonus = bonus;}@Overridepublic void printSal() {System.out.println("经理是"+getName()+" 工资是"+(getDaySal()*getWorkDays()*getGrade()+bonus));}
}

347-作业05

348-作业06

super只可以继承父类的公共属性和方法

this可以访问本类的所有属性和方法，父类的公共属性和方法，本类有的使用就近原则，不去找父类的了

349-作业07

new Demo().test();

编译阶段，new，无参构造，super（）输出Test，再输出Demo，

运行阶段，.test()，Rose，Jack

new Demo（）.test();

编译阶段，设置父类名称，无输出

运行阶段，john，Jack

350-作业08

package chapter08.homeworks;public class SavingAccount extends BankAccount{private int count=3;private double rate=0.01;public void earnMonthlyInterest(){count=3;super.deposit(getBalance()*rate);}@Overridepublic void deposit(double amount) {if (count>0){super.deposit(amount);count-=1;}else {super.deposit(amount-1);}}@Overridepublic void withdraw(double amount) {if(count>0){super.withdraw(amount);count-=1;}else {super.withdraw(amount+1);}}public SavingAccount(double initialBalance) {super(initialBalance);}public int getCount() {return count;}public void setCount(int count) {this.count = count;}public double getRate() {return rate;}public void setRate(double rate) {this.rate = rate;}
}